configure.ac 126 KB
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dnl Autoconf settings for vlc
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AC_COPYRIGHT([Copyright 1999-2018 VLC authors and VideoLAN])
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AC_INIT(vlc, 3.0.0-rc7)
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VERSION_MAJOR=3
VERSION_MINOR=0
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VERSION_REVISION=0
VERSION_EXTRA=0
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VERSION_DEV=rc7
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PKGDIR="vlc"
AC_SUBST(PKGDIR)
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CONFIGURE_LINE="`echo "$0 $ac_configure_args" | sed -e 's/\\\/\\\\\\\/g'`"
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CODENAME="Vetinari"
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COPYRIGHT_YEARS="1996-2018"
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AC_CONFIG_SRCDIR(src/libvlc.c)
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AC_CONFIG_AUX_DIR(autotools)
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AC_CONFIG_MACRO_DIR(m4)
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AC_CONFIG_LIBOBJ_DIR(compat)
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AC_CANONICAL_BUILD
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AC_CANONICAL_HOST
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AC_PRESERVE_HELP_ORDER
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AM_INIT_AUTOMAKE(tar-ustar color-tests foreign)
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AC_CONFIG_HEADERS([config.h])
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AM_SILENT_RULES([yes])
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AM_MAINTAINER_MODE([enable])
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dnl
dnl Directories
dnl
dnl vlcincludedir="\${includedir}/\${PKGDIR}"
dnl AC_SUBST(vlcincludedir)
vlcdatadir="\${datadir}/\${PKGDIR}"
AC_SUBST(vlcdatadir)
vlclibdir="\${libdir}/\${PKGDIR}"
AC_SUBST(vlclibdir)

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dnl
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dnl Check for tools
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dnl
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AC_PROG_CC
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AC_USE_SYSTEM_EXTENSIONS
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VLC_PROG_CC_C11
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AC_DEFINE([_FORTIFY_SOURCE], 2, [Define to 2 to get glibc warnings.])
AC_DEFINE([_FILE_OFFSET_BITS], 64, [Define to 64 for large files support.])
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AH_TOP([
#ifndef _REENTRANT
# define _REENTRANT
#endif
])
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AC_DEFINE([_THREAD_SAFE],, [Same as _REENTANT for some other OSes.])
AC_DEFINE([__LIBVLC__],, [Define within the LibVLC source code tree.])
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AC_DEFINE([WIN32_LEAN_AND_MEAN],, [Define to limit the scope of <windows.h>.])
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AM_PROG_CC_C_O
AC_PROG_CXX
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AC_PROG_CPP
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AC_PROG_OBJC
AC_PROG_EGREP
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AC_PROG_MAKE_SET
AC_PROG_INSTALL
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AM_PROG_AS
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AC_PROG_LEX
AC_PROG_YACC
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AC_ARG_VAR([DESKTOP_FILE_VALIDATE], [Validator for desktop entry files])
AC_CHECK_PROGS(DESKTOP_FILE_VALIDATE, [${DESKTOP_FILE_VALIDATE} desktop-file-validate], :)
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AC_ARG_VAR([BUILDCC], [Build system C11 or C99 compiler command])
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AC_CHECK_PROGS(BUILDCC, [c11-gcc c11 c99-gcc c99], [false])
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AS_IF([test "$BUILDCC" = "false"], [
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  AC_MSG_ERROR([Cannot find native C99 compiler: please define BUILDCC.])
])
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dnl Check for compiler properties
AC_C_CONST
AC_C_INLINE
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AC_C_RESTRICT
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AX_CXX_COMPILE_STDCXX_11(noext, mandatory)
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dnl Extend the --help string at the current spot.
AC_DEFUN([EXTEND_HELP_STRING], [m4_divert_once([HELP_ENABLE], [$1])])

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dnl Allow binary package maintainer to pass a custom string to avoid
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dnl cache problem
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AC_ARG_WITH(binary-version,
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    AS_HELP_STRING([--with-binary-version=STRING],
         [To avoid plugins cache problem between binary version]),[],[])
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AS_IF([test -n "${with_binary_version}"],[
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    AC_DEFINE_UNQUOTED([DISTRO_VERSION],["${with_binary_version}"],
         [Binary specific version])
])
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dnl Prevent clang from accepting unknown flags with a mere warning
AX_APPEND_COMPILE_FLAGS([-Werror=unknown-warning-option -Werror=invalid-command-line-argument], [CFLAGS])
AX_APPEND_COMPILE_FLAGS([-Werror=unknown-warning-option -Werror=invalid-command-line-argument], [CXXFLAGS])

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dnl
dnl  Check the operating system
dnl
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HAVE_WIN64="0"
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HAVE_IOS="0"
HAVE_OSX="0"
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HAVE_TVOS="0"
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case "${host_os}" in
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  "")
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    SYS=unknown
    ;;
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  linux*)
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    SYS=linux
    ;;
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  bsdi*)
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    SYS=bsdi
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    CFLAGS="${CFLAGS} -pthread"
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    ;;
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  freebsd*)
    SYS=freebsd
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    CFLAGS="${CFLAGS} -pthread"
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    CPPFLAGS="${CPPFLAGS} -I/usr/local/include"
    LDFLAGS="${LDFLAGS} -L/usr/local/lib"
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    ac_cv_ld_z_defs=no
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    ;;
  openbsd*)
    SYS=openbsd
    CPPFLAGS="${CPPFLAGS} -I/usr/local/include -I/usr/X11R6/include"
    LDFLAGS="${LDFLAGS} -L/usr/local/lib -L/usr/X11R6/lib/"
    ;;
  netbsd*)
    SYS=netbsd
    ;;
  dragonfly*)
    SYS=dragonfly
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    ;;
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  darwin*)
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    dnl Force gcc "-arch" flag
    ARCH_flag=""
    case "${host}" in
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      i?86*)
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        ARCH_flag="-arch i386"
      ;;
      ppc64*)
        ARCH_flag="-arch ppc64"
      ;;
      ppc*)
        ARCH_flag="-arch ppc"
      ;;
      x86_64*)
        ARCH_flag="-arch x86_64"
      ;;
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      arm*)
        ac_cv_c_bigendian="no"
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        ac_cv_c_attribute_packed="no"
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      ;;
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    esac

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    SYS=darwin
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    CFLAGS="${CFLAGS} -D_INTL_REDIRECT_MACROS -std=gnu11 ${ARCH_flag}"
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    CXX="${CXX} -stdlib=libc++ -std=c++11"
    CXXFLAGS="${CXXFLAGS} -D_INTL_REDIRECT_MACROS ${ARCH_flag}"
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    CPPFLAGS="${CPPFLAGS} ${ARCH_flag}"
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    OBJCFLAGS="${OBJCFLAGS} -D_INTL_REDIRECT_MACROS -std=gnu11 ${ARCH_flag} -Werror=partial-availability"
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    LDFLAGS="${LDFLAGS} -Wl,-headerpad_max_install_names ${ARCH_flag}"
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    VLC_ADD_LIBS([libvlc vlc],[-Wl,-undefined,dynamic_lookup,-framework,AppKit])
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    VLC_ADD_LIBS([libvlccore],[-Wl,-framework,CoreFoundation,-framework,CoreServices])
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    AC_EGREP_CPP(yes,
            [#import <TargetConditionals.h>
             #if TARGET_OS_IPHONE
             yes
             #endif],
             [HAVE_IOS="1"],
             [HAVE_OSX="1"])

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    AC_EGREP_CPP(yes,
            [#import <TargetConditionals.h>
             #if TARGET_OS_TV
             yes
             #endif],
             [HAVE_TVOS="1"
             HAVE_IOS="0"
             HAVE_OSX="0"
             ],)

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    dnl
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    dnl  Handle Mac OS X SDK flags
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    dnl
    AC_ARG_WITH(macosx-sdk,
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      [AS_HELP_STRING([--with-macosx-sdk=DIR],
        [compile using the SDK in DIR])])
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    if test "${with_macosx_sdk}" != "" ; then
        test ! -d "${with_macosx_sdk}" && AC_MSG_ERROR([SDK "${with_macosx_sdk}" not found])
        CPP="${CPP} -isysroot ${with_macosx_sdk}"
        CC="${CC} -isysroot ${with_macosx_sdk}"
        CXX="${CXX} -isysroot ${with_macosx_sdk}"
        OBJC="${OBJC} -isysroot ${with_macosx_sdk}"
        LD="${LD} -syslibroot ${with_macosx_sdk}"
    fi
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    AC_ARG_WITH(macosx-version-min,
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      [AS_HELP_STRING([--with-macosx-version-min=VERSION],
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        [compile for Mac OS X VERSION and above])])
    if test "${with_macosx_version_min}" != "" ; then
        CPP="${CPP} -mmacosx-version-min=${with_macosx_version_min}"
        CC="${CC} -mmacosx-version-min=${with_macosx_version_min}"
        CXX="${CXX} -mmacosx-version-min=${with_macosx_version_min}"
        OBJC="${OBJC} -mmacosx-version-min=${with_macosx_version_min}"
        LD="${LD} -mmacosx_version_min=${with_macosx_version_min}"
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    fi
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    ;;
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  *mingw32* | *cygwin* | *wince* | *mingwce*)
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    dnl Force libtool to not link to (shared) libgcc_s when detecting C++ dependencies
    dnl When doing this test with -static-libgcc it will link on (static) libgcc_eh
    CXXFLAGS="${CXXFLAGS} -static-libgcc"
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    AC_CHECK_TOOL(WINDRES, windres, :)
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    AC_CHECK_TOOL(OBJCOPY, objcopy, :)
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    AH_TOP([#if defined(_WIN32) && !defined(_WIN32_WINNT)])
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    AH_TOP([# define _WIN32_WINNT 0x0502 /* Windows XP SP2 */])
    AH_TOP([#endif])
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    AC_DEFINE([_WIN32_IE], 0x0600, [Define to '0x0600' for IE 6.0 (and shell) APIs.])
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    AC_DEFINE([_UNICODE], [1], [Define to 1 for Unicode (Wide Chars) APIs.])
    AC_DEFINE([UNICODE], [1], [Define to 1 for Unicode (Wide Chars) APIs.])
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    AC_DEFINE([_ISOC99_SOURCE], [1], [Extensions to ISO C89 from ISO C99.])
    AC_DEFINE([_ISOC11_SOURCE], [1], [Extensions to ISO C99 from ISO C11.])
    AC_DEFINE([_POSIX_SOURCE], [1], [IEEE Std 1003.1.])
    AC_DEFINE([_POSIX_C_SOURCE], [200809L], [IEEE Std 1003.1.])
    AC_DEFINE([_XOPEN_SOURCE], [700], [POSIX and XPG 7th edition])
    AC_DEFINE([_XOPEN_SOURCE_EXTENDED], [1], [XPG things and X/Open Unix extensions.])
    AC_DEFINE([_BSD_SOURCE], [1], [ISO C, POSIX, and 4.3BSD things.])
    AC_DEFINE([_SVID_SOURCE], [1], [ISO C, POSIX, and SVID things.])
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    case "${host_os}" in
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      *mingw32*)
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        SYS=mingw32
        ;;
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      *cygwin*)
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        dnl Check if we are using the mno-cygwin mode in which case we are
        dnl actually dealing with a mingw32 compiler.
        AC_EGREP_CPP(yes,
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            [#ifdef _WIN32
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             yes
             #endif],
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            SYS=mingw32, AC_MSG_ERROR([VLC requires -mno-cygwin]))
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        ;;
    esac

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    if test "${SYS}" = "mingw32"; then
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        # DEP, ASLR, NO SEH
        LDFLAGS="${LDFLAGS} -Wl,--nxcompat -Wl,--no-seh -Wl,--dynamicbase"

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        AC_CHECK_PROGS(U2D, [unix2dos todos], unix2dos)
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        ac_default_prefix="`pwd`/_win32"
        DESTDIR="`pwd`/_win32/"
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        dnl
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        dnl NSIS/MSI Installer prefix and WIN64
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        dnl
        case "${host}" in
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            amd64*|x86_64*)
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                HAVE_WIN64="1"
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                WINDOWS_ARCH="x64"
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                PROGRAMFILES="PROGRAMFILES64"
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                LDFLAGS="${LDFLAGS} -Wl,--high-entropy-va -Wl,--image-base,0x140000000"
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            ;;
            *)
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                WINDOWS_ARCH="x86"
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                PROGRAMFILES="PROGRAMFILES"
            ;;
        esac
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        AC_SUBST(WINDOWS_ARCH)
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        AC_SUBST(PROGRAMFILES)

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    fi
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    ;;
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  *nto*)
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    SYS=nto
    ;;
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  solaris*)
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    SYS=solaris
    ;;
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  hpux*)
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    SYS=hpux
    ;;
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  *os2*)
    SYS=os2
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    LDFLAGS="${LDFLAGS} -Zomf -Zbin-files -Zargs-wild -Zhigh-mem"
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    AC_LIBOBJ([freeaddrinfo])
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    AC_LIBOBJ([gai_strerror])
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    AC_CHECK_FUNCS([if_nametoindex])
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    ;;
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  *nacl*)
    SYS=nacl
    AC_DEFINE([_XOPEN_SOURCE], [700], [POSIX and XPG 7th edition])
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    AC_LIBOBJ([sigwait])
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    AC_LIBOBJ([recvmsg])
    AC_LIBOBJ([sendmsg])
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    ;;
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  *)
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    SYS="${host_os}"
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    ;;
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esac
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dnl WinRT
AC_ARG_ENABLE(winstore_app,
     AS_HELP_STRING([--enable-winstore-app],
                    [Build targetted for Windows Store apps (default disabled)]))

vlc_winstore_app=0
AS_IF([test "${SYS}" = "mingw32"],[
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  LIBCOM="-lole32"
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  AS_IF([test "${enable_winstore_app}" = "yes"], [
    vlc_winstore_app=1
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    LIBCOM=""
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     VLC_ADD_LIBS([libvlccore], [-lruntimeobject])
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     AC_LIBOBJ([gai_strerror])
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    ],[])
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  AC_SUBST(LIBCOM)
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  ])
AC_DEFINE_UNQUOTED(VLC_WINSTORE_APP, ${vlc_winstore_app}, [Define to 1 if you want to build for Windows Store apps])

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AM_CONDITIONAL(HAVE_LINUX,   test "${SYS}" = "linux")
AM_CONDITIONAL(HAVE_OS2,     test "${SYS}" = "os2")
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AM_CONDITIONAL(HAVE_DARWIN,  test "${SYS}" = "darwin")
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AM_CONDITIONAL(HAVE_IOS,     test "${HAVE_IOS}" = "1")
AM_CONDITIONAL(HAVE_OSX,     test "${HAVE_OSX}" = "1")
AM_CONDITIONAL(HAVE_TVOS,    test "${HAVE_TVOS}" = "1")
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AM_CONDITIONAL(HAVE_NACL,    test "${SYS}" = "nacl")
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AM_CONDITIONAL(HAVE_LIBANL,  test "${HAVE_LIBANL}" = "1")
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AM_CONDITIONAL(HAVE_WIN32,   test "${SYS}" = "mingw32")
AM_CONDITIONAL(HAVE_WIN64,   test "${HAVE_WIN64}" = "1") dnl Only used for the packaging
AM_CONDITIONAL([HAVE_WINSTORE], [test "$vlc_winstore_app" = "1"])
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AM_CONDITIONAL([HAVE_WIN32_DESKTOP], [test "${SYS}" = "mingw32" -a "$vlc_winstore_app" = "0"])
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dnl
dnl Sadly autoconf does not think about testing foo.exe when ask to test
dnl for program foo on win32
case "${build_os}" in
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    cygwin|msys|mingw32)
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        ac_executable_extensions=".exe"
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        BUILDEXEEXT=".exe"
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    ;;
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    os2*)
        BUILDEXEEXT=".exe"
    ;;
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    *)
    ;;
esac
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AC_SUBST(BUILDEXEEXT)
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dnl Android is linux, but a bit different
AS_IF([test "$SYS" = linux],[
    AC_MSG_CHECKING([for an Android system])
    AC_PREPROC_IFELSE([AC_LANG_PROGRAM(
        [[#ifndef __ANDROID__
         # error Not Android
         #endif
        ]],[[;]])
    ],[
      HAVE_ANDROID="1"
      AC_MSG_RESULT([yes])
    ],[
      AC_MSG_RESULT([no])
    ])
])
AM_CONDITIONAL(HAVE_ANDROID, test "${HAVE_ANDROID}" = "1")

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dnl Tizen (minimum SDK version: 2.3)
AS_IF([test "$SYS" = linux],[
    AC_MSG_CHECKING([for Tizen])
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    AC_PREPROC_IFELSE([AC_LANG_PROGRAM(
        [[#include <tizen.h>
        ]],[[;]])
    ],[
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      HAVE_TIZEN="1"
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      AC_DEFINE([HAVE_TIZEN_SDK], [1], [Define to 1 if vlc is built against Tizen SDK])
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      AC_MSG_RESULT([yes])
    ],[
      AC_MSG_RESULT([no])
    ])
])
AM_CONDITIONAL(HAVE_TIZEN, test "${HAVE_TIZEN}" = "1")
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dnl
dnl  Check for the contrib directory
dnl
AC_ARG_WITH(contrib,
  [AS_HELP_STRING([--with-contrib[=DIR]],
    [search for 3rd party libraries in DIR/include and DIR/lib])
])
AC_MSG_CHECKING([for 3rd party libraries path])
AS_IF([test -z "${with_contrib}" || test "${with_contrib}" = "yes"], [
  CONTRIB_DIR="${srcdir}/contrib/${host}"
  AS_IF([test ! -d "${CONTRIB_DIR}"], [
    echo "${CONTRIB_DIR} not found" >&AS_MESSAGE_LOG_FD
    CONTRIB_DIR="${srcdir}/contrib/`$CC -dumpmachine`"
    AS_IF([test ! -d "${CONTRIB_DIR}"], [
      echo "${CONTRIB_DIR} not found" >&AS_MESSAGE_LOG_FD
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      CONTRIB_DIR=""
      AC_MSG_RESULT([not found])
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    ])
  ])
], [
  AS_IF([test "${with_contrib}" != "no"], [
    CONTRIB_DIR="${with_contrib}"
  ], [
    CONTRIB_DIR=""
    AC_MSG_RESULT([disabled])
  ])
])
AS_IF([test -n "${CONTRIB_DIR}"], [
  AS_IF([test -d "${CONTRIB_DIR}/lib"],[
    CONTRIB_DIR=`cd "${CONTRIB_DIR}" && pwd`
  ], [
    echo "${CONTRIB_DIR}/lib not found" >&AS_MESSAGE_LOG_FD
    CONTRIB_DIR=""
    AC_MSG_RESULT([not usable])
  ])

])
AS_IF([test -n "${CONTRIB_DIR}"], [
  AC_MSG_RESULT([${CONTRIB_DIR}])
  CPPFLAGS="${CPPFLAGS} -I${CONTRIB_DIR}/include"
  CFLAGS="${CFLAGS} -I${CONTRIB_DIR}/include"
  CXXFLAGS="${CXXFLAGS} -I${CONTRIB_DIR}/include"
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  OBJCFLAGS="${OBJCFLAGS} -I${CONTRIB_DIR}/include -F${CONTRIB_DIR} -F${CONTRIB_DIR}/Frameworks"
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  export PKG_CONFIG_PATH="${CONTRIB_DIR}/lib/pkgconfig:$PKG_CONFIG_PATH"
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  LDFLAGS="${LDFLAGS} -L${CONTRIB_DIR}/lib"
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  AS_IF([test -z "$LUAC"], [
    dnl Old contribs mixed cross-tools and cross-compiled executables
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    AS_IF([test -x "${CONTRIB_DIR}/bin/luac${BUILDEXEEXT}"], [
      LUAC="${CONTRIB_DIR}/bin/luac${BUILDEXEEXT}"
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    ])

    dnl Newer contribs follow usual name space rules
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    AS_IF([test -x "${CONTRIB_DIR}/../bin/${host_alias}-luac${BUILDEXEEXT}"], [
      LUAC="${CONTRIB_DIR}/../bin/${host_alias}-luac${BUILDEXEEXT}"
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    ])
  ])
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  AS_IF([test "${SYS}" = "darwin"], [
    export LD_LIBRARY_PATH="${CONTRIB_DIR}/lib:$LD_LIBRARY_PATH"
    export DYLD_LIBRARY_PATH="${CONTRIB_DIR}/lib:$DYLD_LIBRARY_PATH"
  ])
], [
  AS_IF([test -n "${with_contrib}" && test "${with_contrib}" != "no"], [
    AC_MSG_ERROR([Third party libraries not found!])
  ])
])
AC_SUBST(CONTRIB_DIR)

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dnl Add extras/tools to the PATH
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TOOLS_DIR="${srcdir}/extras/tools/build/bin"
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AS_IF([test -d "${TOOLS_DIR}"], [
    TOOLS_DIR=`cd "${TOOLS_DIR}" && pwd`
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    export PATH="${TOOLS_DIR}":$PATH
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])

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dnl
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dnl  Libtool
dnl  It's very bad, but our former custom system was worst
dnl  -- Courmisch
dnl
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dnl override platform specific check for dependent libraries
dnl otherwise libtool linking of shared libraries will
dnl fail on anything other than pass_all.
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AC_CACHE_VAL(lt_cv_deplibs_check_method,
    [lt_cv_deplibs_check_method=pass_all])
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LT_INIT([dlopen win32-dll shared disable-static])
LT_LANG([C++])
LT_LANG([Windows Resource])
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DOLT

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lt_cv_deplibs_check_method=pass_all

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AS_IF([test "${enable_shared}" = "no" -a "${enable_vlc}" != "no"], [
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  AC_MSG_ERROR([VLC is based on plugins. Shared libraries cannot be disabled.])
])

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dnl
dnl Gettext stuff
dnl
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AM_GNU_GETTEXT_VERSION([0.19.8])
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AM_GNU_GETTEXT([external], [need-formatstring-macros])
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dnl
dnl Iconv stuff
dnl
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AM_ICONV
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dnl
dnl checks for mingw
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AS_IF([test "${SYS}" = "mingw32"], [
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AC_PREPROC_IFELSE([AC_LANG_SOURCE([
#if !defined(__MINGW32__)
# error Not compiling with mingw
#endif
    ])], [

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dnl Check for broken versions of mingw-runtime compatability library
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    AC_MSG_CHECKING(for broken mingw-runtime)
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    AC_PREPROC_IFELSE([AC_LANG_SOURCE([
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#include <_mingw.h>
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#if defined(__MINGW64_VERSION_MAJOR)
# if __MINGW64_VERSION_MAJOR < 3
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#  error Attempting to use mingw-runtime with broken vsnprintf support
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# endif
#elif __MINGW32_MAJOR_VERSION == 3 && __MINGW32_MINOR_VERSION < 15
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# error Attempting to use mingw-runtime with broken vsnprintf support
#endif
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    ])], [
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        AC_MSG_RESULT([ok])
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    ], [
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        AC_MSG_RESULT([present])
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        AC_MSG_ERROR([LibVLC requires mingw-runtime version 3.15 or higher, or mingw-w64 version 3.0 or higher!])
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    ])
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    dnl force use of mingw provided c99 *printf over msvcrt
    CPPFLAGS="${CPPFLAGS} -D__USE_MINGW_ANSI_STDIO=1"

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    dnl Check for the need to include the mingwex lib for mingw32
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    VLC_SAVE_FLAGS
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    AC_CHECK_LIB(mingwex,opendir,
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        AC_CHECK_LIB(mingw32,opendir,,
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            [VLC_ADD_LIBS([libvlccore],[-lmingwex])])
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    )
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    VLC_RESTORE_FLAGS
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    ], [
        AC_MSG_RESULT([Not compiling with mingw])
    ])
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    dnl Check for fnative-struct or mms-bitfields support for mingw32
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    VLC_SAVE_FLAGS
    CFLAGS="${CFLAGS} -mms-bitfields"
    CXXFLAGS="${CXXFLAGS} -mms-bitfields"
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    AC_CACHE_CHECK([if \$CC accepts -mms-bitfields],
        [ac_cv_c_mms_bitfields],
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        [AC_TRY_COMPILE([],,ac_cv_c_mms_bitfields=yes, ac_cv_c_mms_bitfields=no)])
    if test "${ac_cv_c_mms_bitfields}" = "no"; then
        VLC_RESTORE_FLAGS
        CFLAGS="${CFLAGS} -fnative-struct"
        CXXFLAGS="${CXXFLAGS} -fnative-struct"
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        AC_CACHE_CHECK([if \$CC accepts -fnative-struct],
            [ac_cv_c_fnative_struct],
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            [AC_TRY_COMPILE([],,ac_cv_c_fnative_struct=yes, ac_cv_c_fnative_struct=no)])
        "${ac_cv_c_fnative_struct}" = "no" && VLC_RESTORE_FLAGS
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    fi
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])
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dnl
dnl Buggy glibc prevention. Purposedly not cached.
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dnl See sourceware.org bugs 5058 and 5443.
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dnl Ubuntu alone has 20 bug numbers for this...
dnl
AC_MSG_CHECKING(for buggy GNU/libc versions)
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AC_PREPROC_IFELSE([AC_LANG_SOURCE([
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#include <limits.h>
#if defined (__GLIBC__) && (__GLIBC__ == 2) \
  && (__GLIBC_MINOR__ >= 5) && (__GLIBC_MINOR__ <= 7)
# error GNU/libc with dcgettext killer bug!
#endif
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])], [
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  AC_MSG_RESULT([not present])
], [
  AC_MSG_RESULT([found])
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  AS_IF([test "x${enable_nls}" != "xno"], [
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    AC_MSG_ERROR([Buggy GNU/libc (version 2.5 - 2.7) present. VLC would crash; there is no viable
work-around for this. Check with your distribution vendor on how to update the
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glibc run-time. Alternatively, build with --disable-nls.])
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  ])
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])

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dnl Plugin compilation stuff

VLC_LIBRARY_SUFFIX

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dnl Check for system libs needed
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need_libc=false
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dnl Check for usual libc functions
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AC_CHECK_FUNCS([daemon fcntl flock fstatvfs fork getenv getpwuid_r isatty lstat memalign mkostemp mmap open_memstream openat pread posix_fadvise posix_madvise posix_memalign setlocale stricmp strnicmp strptime tdestroy uselocale])
AC_REPLACE_FUNCS([aligned_alloc atof atoll dirfd fdopendir ffsll flockfile fsync getdelim getpid lldiv memrchr nrand48 poll recvmsg rewind sendmsg setenv strcasecmp strcasestr strdup strlcpy strndup strnlen strnstr strsep strtof strtok_r strtoll swab tfind timegm timespec_get strverscmp pathconf])
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AC_REPLACE_FUNCS([gettimeofday])
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AC_CHECK_FUNC(fdatasync,,
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  [AC_DEFINE(fdatasync, fsync, [Alias fdatasync() to fsync() if missing.])
])
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VLC_REPLACE_DECL([realpath], [#include <stdlib.h>])

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dnl mingw64 implements those as static inline, not functions with C linkage
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VLC_REPLACE_DECL([asprintf], [#include <stdio.h>])
VLC_REPLACE_DECL([vasprintf], [#include <stdio.h>])
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VLC_REPLACE_DECL([gmtime_r], [#include <time.h>])
VLC_REPLACE_DECL([localtime_r], [#include <time.h>])
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dnl C11 static_assert()
AC_MSG_CHECKING([for static_assert in assert.h])
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AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <assert.h>], [
static_assert(1, "The impossible happened.");
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])], [
  AC_MSG_RESULT([yes])
  AC_DEFINE([HAVE_STATIC_ASSERT], [1], [Define to 1 if <assert.h> defines static_assert.])
], [
  AC_MSG_RESULT([no])
])

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# Windows CE does not have strcoll()
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AC_FUNC_STRCOLL

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dnl Check for non-standard system calls
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case "$SYS" in
  "linux")
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    AC_CHECK_FUNCS([accept4 pipe2 eventfd vmsplice sched_getaffinity recvmmsg])
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    ;;
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  "mingw32")
    AC_CHECK_FUNCS([_lock_file])
    ;;
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esac
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AH_BOTTOM([#include <vlc_fixups.h>])

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dnl Check for struct pollfd
AC_CHECK_TYPES([struct pollfd],,,
[#include <sys/types.h>
#if HAVE_POLL
# include <poll.h>
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#elif defined (_WIN32)
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# include <winsock2.h>
#endif
])

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dnl Check for struct timespec
AC_CHECK_TYPES([struct timespec],,,
[#include <time.h>])

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dnl Check for max_align_t
AC_CHECK_TYPES([max_align_t],,,
[#include <stddef.h>])

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dnl Checks for socket stuff
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VLC_SAVE_FLAGS
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SOCKET_LIBS=""
AC_SEARCH_LIBS(connect, [socket], [
  AS_IF([test "$ac_cv_search_connect" != "none required"], [
    SOCKET_LIBS="$ac_cv_search_connect"
  ])
], [
  AS_IF([test "${SYS}" = "mingw32"], [
    SOCKET_LIBS="-lws2_32"
  ])
])
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AC_SEARCH_LIBS([inet_pton], [nsl], [
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 AS_IF([test "$ac_cv_search_inet_pton" != "none required"], [
    SOCKET_LIBS="$ac_cv_search_inet_pton $SOCKET_LIBS"
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  ])
],, [${SOCKET_LIBS}])

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LIBS="${LIBS} ${SOCKET_LIBS}"
AC_LINK_IFELSE([
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    AC_LANG_PROGRAM([#ifdef _WIN32
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        # if _WIN32_WINNT < 0x600
        #  error Needs vista+
        # endif
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        #include <ws2tcpip.h>
        #else
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        #include <sys/socket.h>
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        #include <arpa/inet.h>
        #endif], [
        char dst[[sizeof(struct in_addr)]];
        inet_pton(AF_INET, "127.0.0.1", dst);
    ])],[AC_DEFINE([HAVE_INET_PTON],[1],[Define to 1 if you have inet_pton function])],[AC_LIBOBJ([inet_pton])])
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AC_CHECK_FUNCS([if_nameindex if_nametoindex])
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VLC_RESTORE_FLAGS
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AC_SUBST(SOCKET_LIBS)
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dnl Check for socklen_t
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AH_TEMPLATE(socklen_t, [Define to `int' if <sys/socket.h> does not define.])
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AC_CACHE_CHECK([for socklen_t in sys/socket.h], dnl ` (fix VIM syntax highlight
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ac_cv_type_socklen_t,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
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[#include <sys/types.h>
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#ifdef _WIN32
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# include <winsock2.h>
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# include <ws2tcpip.h>
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#else
# include <sys/socket.h>
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#endif]], [[socklen_t len; len = 0;]])],
ac_cv_type_socklen_t=yes,
ac_cv_type_socklen_t=no)])
AS_IF([test "$ac_cv_type_socklen_t" = no],
 [AC_DEFINE(socklen_t, int)])
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dnl Check for struct sockaddr_storage
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AH_TEMPLATE(sockaddr_storage, [Define to `sockaddr' if <sys/socket.h> does not define.]) dnl ` (fix VIM syntax highlight
AH_TEMPLATE(ss_family, [Define to `sa_family' if <sys/socket.h> does not define.]) dnl ` (fix VIM syntax highlight
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AC_CACHE_CHECK([for struct sockaddr_storage], ac_cv_struct_sockaddr_storage,
  [AC_TRY_COMPILE(
    [#include <sys/types.h>
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     #if defined( _WIN32 )
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     # include <winsock2.h>
     #else
     # include <sys/socket.h>
     #endif], [struct sockaddr_storage addr;],
     ac_cv_struct_sockaddr_storage=yes,
     ac_cv_struct_sockaddr_storage=no)])
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AS_IF([test "${ac_cv_struct_sockaddr_storage}" = no], [
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  AC_DEFINE(sockaddr_storage, sockaddr)
  AC_DEFINE(ss_family, sa_family)
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])
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dnl FreeBSD has a gnugetopt library for this:
GNUGETOPT_LIBS=""
AC_CHECK_FUNC(getopt_long,, [
  AC_CHECK_LIB([gnugetopt],[getopt_long], [
    GNUGETOPT_LIBS="-lgnugetopt"
  ])
])
AC_SUBST(GNUGETOPT_LIBS)
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AC_CHECK_LIB(m,cos,[
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  LIBM="-lm"
], [
  LIBM=""
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])
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AC_SUBST(LIBM)
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AC_CHECK_LIB(m,lrintf, [
  AC_DEFINE(HAVE_LRINTF, 1, [Define to 1 if you have the lrintf function])
  VLC_ADD_LIBS([skins2],[-lm])
])
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AC_CHECK_LIB(m,nanf,
  AC_DEFINE(HAVE_NANF, 1, [Define to 1 if you have the NANF function])
)
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AC_CHECK_LIB(m,sincos, [
  AC_DEFINE(HAVE_SINCOS, 1, [Define to 1 if you have the sincos function.])
], [
  AC_LIBOBJ([sincos])
])
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AC_MSG_CHECKING([_Thread_local support])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([_Thread_local int foo = 0;
                   int main() {}])], [
    AC_MSG_RESULT([ok])
    AC_DEFINE(HAVE_THREAD_LOCAL, 1, [Defined to 1 if C11 _Thread_local storage qualifier is supported])
],[ AC_MSG_RESULT([no])])

dnl __STDC_NO_THREADS__ can't be trusted on some platforms.
dnl check for its availability explicitely
AC_CHECK_HEADERS([threads.h])

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AC_CHECK_LIB([anl],[getaddrinfo_a],[
  AC_DEFINE(HAVE_LIBANL, 1, [Define to 1 if you have the anl library])
])

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dnl Check for dynamic plugins
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LIBDL=""
have_dynamic_objects="no"
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VLC_SAVE_FLAGS
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AC_SEARCH_LIBS(dlsym, [dl svld], [
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  AS_IF([test "$ac_cv_search_dlsym" != "none required"], [
    LIBDL="$ac_cv_search_dlsym"
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  ])
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  have_dynamic_objects="yes"
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])
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VLC_RESTORE_FLAGS
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# Windows
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AS_IF([test "${SYS}" = "mingw32"], [
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  LIBDL=""
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  have_dynamic_objects="yes" #assume we can use shared objects
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])
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AC_ARG_WITH([libfuzzer],
    [AS_HELP_STRING([--with-libfuzzer=DIR],
        [use libFuzzer library from DIR and triggers sanitize coverage (default disabled)])],
     [],
     [with_libfuzzer=no])
AS_VAR_IF(with_libfuzzer, no, [], [
    enable_shared=no
    enable_static=yes
    enable_vlc=no
])
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AM_CONDITIONAL(HAVE_LIBFUZZER, [test "${with_libfuzzer}" != "no"])
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AS_IF([test "${enable_shared}" = "no"], [
  have_dynamic_objects=no
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])
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AM_CONDITIONAL(HAVE_DYNAMIC_PLUGINS, [test "${have_dynamic_objects}" != "no"])

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AC_SUBST(LIBDL)
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dnl Check for thread library
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LIBPTHREAD=""
AS_IF([test "${SYS}" != "mingw32"], [
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  VLC_SAVE_FLAGS
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  LIBS=""
  AC_SEARCH_LIBS(pthread_rwlock_init, pthread pthreads c_r, [
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    AS_IF([test "$ac_cv_search_pthread_rwlock_init" != "none required"], [
      LIBPTHREAD="$ac_cv_search_pthread_rwlock_init"
    ])
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  ])
  VLC_RESTORE_FLAGS
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])
AC_SUBST(LIBPTHREAD)
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AC_SEARCH_LIBS([clock_nanosleep], [rt pthread], [
  AS_IF([test "$ac_cv_search_clock_nanosleep" != "none required"], [
    LIBRT="$ac_cv_search_clock_nanosleep"
  ])
], [
  AC_SEARCH_LIBS([nanosleep], [rt pthread posix4], [
    AS_IF([test "$ac_cv_search_nanosleep" != "none required"], [
      LIBRT="$ac_cv_search_nanosleep"
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    ])
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  ])
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])
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AC_SUBST(LIBRT)
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dnl
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dnl Check for headers
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dnl

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dnl  POSIX
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AC_CHECK_HEADERS([arpa/inet.h pthread.h search.h sys/shm.h sys/socket.h sys/uio.h])
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AC_CHECK_HEADERS([net/if.h], [], [],
[
#include <sys/types.h>
#include <sys/socket.h>
])
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AC_CHECK_HEADER([syslog.h], [have_syslog="yes"], [have_syslog="no"])
AM_CONDITIONAL([HAVE_SYSLOG], [test "$have_syslog" = "yes"])

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dnl  BSD
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AC_CHECK_HEADERS([netinet/tcp.h netinet/udplite.h sys/param.h sys/mount.h])
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dnl  GNU/Linux
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AC_CHECK_HEADERS([features.h getopt.h linux/dccp.h linux/magic.h mntent.h sys/eventfd.h])
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dnl  MacOS
AC_CHECK_HEADERS([xlocale.h])
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dnl LP64 and LLP64 architectures had better define ssize_t by themselves...
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AH_TEMPLATE(ssize_t, [Define to `int' if <stddef.h> does not define.]) dnl ` (fix VIM syntax highlight
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AC_CHECK_TYPE(ssize_t,, [
  AC_DEFINE(ssize_t, int)
])

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dnl It seems that autoconf detects pkg-config only during the first
dnl PKG_CHECK_MODULES from configure.ac - which makes sense. But in our case,
dnl it is nested within a conditional block, so it was not working right.
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dnl Make PKG_CONFIG_PATH precious so that it appears in the help and get saved
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AC_ARG_VAR(PKG_CONFIG_PATH,
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       [Paths where to find .pc not at the default location])
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PKG_PROG_PKG_CONFIG()

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dnl On some OS we need static linking
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AS_IF([test -n "${PKG_CONFIG}" ],[
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    AS_IF([test "${SYS}" = "mingw32" -o "${SYS}" = "darwin" -o "${SYS}" = "os2" ],[
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        PKG_CONFIG="${PKG_CONFIG} --static"
    ])
])
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dnl
dnl Check for zlib.h and -lz along with system -lminizip if available
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dnl
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AC_CHECK_HEADERS(zlib.h, [ have_zlib=yes ], [ have_zlib=no ])
AM_CONDITIONAL(HAVE_ZLIB, [ test "${have_zlib}" = "yes" ])
if test "${have_zlib}" = "yes"
then
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  VLC_ADD_LIBS([sap],[-lz])
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  PKG_CHECK_MODULES([MINIZIP], [minizip] , [ have_minizip=yes ], [
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    AC_CHECK_HEADERS([unzip.h], [
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      have_minizip=yes
      MINIZIP_LIBS="-lminizip -lz"
    ], [
      have_minizip=no
    ])
  ])
fi
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AM_CONDITIONAL(HAVE_MINIZIP, [ test "${have_minizip}" = "yes" ])
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dnl
dnl Domain name i18n support via GNU libidn
dnl
PKG_CHECK_MODULES([IDN], [libidn], [
  have_libidn="yes"
  AC_DEFINE([HAVE_IDN], 1, [Define to 1 if you have GNU libidn.])
], [
  have_libidn="no"
])


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dnl Check for dbus
AC_ARG_ENABLE(dbus,
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  [AS_HELP_STRING([--enable-dbus],
    [compile D-Bus message bus support (default enabled)])])
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have_dbus="no"
AS_IF([test "${enable_dbus}" != "no"], [
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  PKG_CHECK_MODULES(DBUS, [dbus-1 >= 1.6.0], [
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    have_dbus="yes"
  ], [
    AS_IF([test -n "${enable_dbus}"], [
      AC_MSG_ERROR([${DBUS_PKG_ERRORS}.])
    ], [
      AC_MSG_WARN([${DBUS_PKG_ERRORS}.])
    ])
  ])
])
AM_CONDITIONAL([HAVE_DBUS], [test "${have_dbus}" = "yes"])
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dnl Check for systemd
PKG_CHECK_MODULES([SYSTEMD], [libsystemd], [
  have_systemd="yes"
], [
  AC_MSG_WARN([${SYSTEMD_PKG_ERRORS}.])
])
AM_CONDITIONAL([HAVE_SYSTEMD], [test "${have_systemd}" = "yes"])


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EXTEND_HELP_STRING([Optimization options:])
dnl
dnl  Compiler warnings
dnl
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AX_APPEND_COMPILE_FLAGS([-Wall -Wextra -Wsign-compare -Wundef -Wpointer-arith -Wvolatile-register-var -Wformat -Wformat-security], [CFLAGS])
AX_APPEND_COMPILE_FLAGS([-Wall -Wextra -Wsign-compare -Wundef -Wpointer-arith -Wvolatile-register-var -Wformat -Wformat-security], [CXXFLAGS])

AX_APPEND_COMPILE_FLAGS([-Wbad-function-cast -Wwrite-strings -Wmissing-prototypes -Werror-implicit-function-declaration -Winit-self -Wlogical-op -Wshadow=local], [CFLAGS])
AX_APPEND_COMPILE_FLAGS([-pipe], [CFLAGS])
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dnl
dnl  Debugging mode
dnl
AC_ARG_ENABLE(debug,
  [AS_HELP_STRING([--enable-debug],
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    [build with run-time assertions (default disabled)])],,
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  [enable_debug="no"])
AH_TEMPLATE(NDEBUG,
            [Define to 1 if debug code should NOT be compiled])
AS_IF([test "${enable_debug}" != "no"], [
  AC_CHECK_HEADERS([valgrind/valgrind.h])
], [
  AC_DEFINE(NDEBUG)
])

dnl
dnl  Profiling
dnl
AC_ARG_ENABLE(gprof,
  [AS_HELP_STRING([--enable-gprof],[profile with gprof (default disabled)])],,
  [enable_gprof="no"])
AS_IF([test "${enable_gprof}" != "no"], [
  CFLAGS="${CFLAGS} -pg"
  CXXFLAGS="${CXXFLAGS} -pg"
  OBJCFLAGS="${OBJCFLAGS} -pg"
  LDFLAGS="${LDFLAGS} -pg"
])

AC_ARG_ENABLE(cprof,
  [AS_HELP_STRING([--enable-cprof],[profile with cprof (default disabled)])],,
  [enable_cprof="no"])
AS_IF([test "${enable_gprof}" != "no"], [
  CFLAGS="${CFLAGS} -finstrument-functions"
  CXXFLAGS="${CXXFLAGS} -finstrument-functions"
  OBJCFLAGS="${OBJCFLAGS} -finstrument-functions"
  LDFLAGS="${LDFLAGS} -finstrument-functions"
])

dnl
dnl  Test coverage
dnl
AC_ARG_ENABLE(coverage,
  [AS_HELP_STRING([--enable-coverage],
    [build for test coverage (default disabled)])],,
  [enable_coverage="no"])
AS_IF([test "${enable_coverage}" != "no"], [
  CFLAGS="-fprofile-arcs -ftest-coverage ${CFLAGS}"
  CXXFLAGS="-fprofile-arcs -ftest-coverage ${CXXFLAGS}"
  LDFLAGS="-lgcov ${LDFLAGS}"
])

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AS_IF([test "${SYS}" != "mingw32" -a "${SYS}" != "os2"], [
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  VLC_SAVE_FLAGS
  CFLAGS="${CFLAGS} -fvisibility=hidden"
  CXXFLAGS="${CXXFLAGS} -fvisibility=hidden"
  OBJCFLAGS="${OBJCFLAGS} -fvisibility=hidden"
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  AC_CACHE_CHECK([if $CC accepts -fvisibility=hidden],
                 [ac_cv_c_visibility_hidden], [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [
      ac_cv_c_visibility_hidden=yes
    ], [
      ac_cv_c_visibility_hidden=no
    ])
  ])
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  AS_IF([test "${ac_cv_c_visibility_hidden}" = "no"], [VLC_RESTORE_FLAGS])
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])

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dnl
dnl Sanitizer flags
dnl
AC_ARG_WITH([sanitizer],
    [AS_HELP_STRING([--with-sanitizer=(address/memory/undefined/thread)],
        [build with sanitizer flags (default disabled)])],
     [],
     [with_sanitizer=no])

AS_VAR_IF(with_sanitizer, no, [], [
    AX_CHECK_COMPILE_FLAG([-fsanitize=${with_sanitizer}], [
        AX_APPEND_FLAG([-fsanitize=${with_sanitizer}])
        AX_APPEND_FLAG([-fsanitize=${with_sanitizer}], [CXXFLAGS])
        AX_APPEND_FLAG([-fsanitize=${with_sanitizer}], [LDFLAGS])
    ], [
        AC_MSG_ERROR(["-fsanitize=${with_sanitizer} not supported!"])
    ])
    AX_APPEND_FLAG([-g])
    AX_APPEND_FLAG([-g], [CXXFLAGS])

    AS_IF([test -z "${with_sanitizer##*address*}" ], [
       AX_APPEND_COMPILE_FLAGS([-fsanitize-address-use-after-scope -fno-omit-frame-pointer])
       AX_APPEND_COMPILE_FLAGS([-fsanitize-address-use-after-scope -fno-omit-frame-pointer], [CXXFLAGS])
    ])
    AS_IF([test -z "${with_sanitizer##*memory*}" ], [
        AX_APPEND_COMPILE_FLAGS([-fPIE -pie])
        AX_APPEND_COMPILE_FLAGS([-fPIE -pie], [CXXFLAGS])
    ])
    AS_IF([test -z "${with_sanitizer##*thread*}" ], [
        AX_APPEND_COMPILE_FLAGS([-fPIE -pie])
        AX_APPEND_COMPILE_FLAGS([-fPIE -pie], [CXXFLAGS])
    ])
])
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dnl
dnl  Enable/disable optimizations
dnl
AC_ARG_ENABLE(optimizations,
  [AS_HELP_STRING([--disable-optimizations],
    [disable compiler optimizations (default enabled)])],,
  [enable_optimizations="yes"])

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dnl Check for various optimization flags
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AS_IF([test "${enable_optimizations}" != "no"], [

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  dnl -O3 only in production builds
Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
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  AS_IF([test "${enable_debug}" = "no"], [
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    VLC_SAVE_FLAGS
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    CFLAGS="${CFLAGS} -O3"
    CXXFLAGS="${CXXFLAGS} -O3"
    OBJCFLAGS="${OBJCFLAGS} -O3"
    AC_CACHE_CHECK([if $CC accepts -O3],  [ac_cv_c_o3], [
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      AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [
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        ac_cv_c_o3=yes
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      ], [
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        ac_cv_c_o3=no
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      ])
    ])
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    AS_IF([test "${ac_cv_c_o3}" = "no"], [VLC_RESTORE_FLAGS])
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  ])
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  dnl Check for fast maths
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  AX_APPEND_COMPILE_FLAGS([-fno-math-errno -funsafe-math-optimizations -fno-rounding-math -fno-signaling-nans -fcx-limited-range], [CFLAGS])
  AX_APPEND_COMPILE_FLAGS([-fno-math-errno -funsafe-math-optimizations -fno-rounding-math -fno-signaling-nans -fcx-limited-range], [CXXFLAGS])
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AH_BOTTOM([
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#if defined(_MSC_VER) && !defined(__clang__)
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# pragma fenv_access(off)
# pragma fp_contract(on)
#elif defined(__GNUC__)
/* Not supported so far */
#else
# pragma STDC FENV_ACCESS OFF
# pragma STDC FP_CONTRACT ON
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#endif
])
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  dnl Check for -funroll-loops
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  VLC_SAVE_FLAGS
  CFLAGS="${CFLAGS} -funroll-loops"
  CXXFLAGS="${CXXFLAGS} -funroll-loops"
  OBJCFLAGS="${OBJCFLAGS} -funroll-loops"
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  AC_CACHE_CHECK([if $CC accepts -funroll-loops], [ac_cv_c_unroll_loops], [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [
      ac_cv_c_unroll_loops=yes
    ], [
      ac_cv_c_unroll_loops=no
    ])
  ])
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  AS_IF([test "${ac_cv_c_unroll_loops}" = "no"], [VLC_RESTORE_FLAGS])
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  AS_IF([test "$enable_debug" = "no"], [
    dnl Check for -fomit-frame-pointer
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    VLC_SAVE_FLAGS
    CFLAGS="${CFLAGS} -fomit-frame-pointer"
    CXXFLAGS="${CXXFLAGS} -fomit-frame-pointer"
    OBJCFLAGS="${OBJCFLAGS} -fomit-frame-pointer"
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    AC_CACHE_CHECK([if $CC accepts -fomit-frame-pointer],
      [ac_cv_c_omit_frame_pointer], [
      AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [
        ac_cv_c_omit_frame_pointer=yes
      ], [
        ac_cv_c_omit_frame_pointer=no
      ])
    ])
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    AS_IF([test "${ac_cv_c_omit_frame_pointer}" = "no"], [VLC_RESTORE_FLAGS])
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  ])
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  AX_APPEND_COMPILE_FLAGS([-fstack-protector-strong])
  AX_APPEND_COMPILE_FLAGS([-fstack-protector-strong], [CXXFLAGS])
  dnl Win32 requires linking to ssp for stack-protection
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  AS_IF([test "${SYS}" = "mingw32"], [
      LDFLAGS="${LDFLAGS} -lssp"
      AS_IF([test "${vlc_winstore_app}" != 1], [LDFLAGS="${LDFLAGS} -ladvapi32"])
  ])
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])
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VLC_SAVE_FLAGS
LDFLAGS="${LDFLAGS} -Wl,-Bsymbolic"
AC_CACHE_CHECK([if linker supports -Bsymbolic], [ac_cv_ld_bsymbolic], [
  AC_TRY_LINK([],, [
    ac_cv_ld_bsymbolic="-Wl,-Bsymbolic"
  ], [
    ac_cv_ld_bsymbolic=""
  ])
])
VLC_RESTORE_FLAGS
SYMBOLIC_LDFLAGS="${ac_cv_ld_bsymbolic}"
AC_SUBST(SYMBOLIC_LDFLAGS)

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VLC_SAVE_FLAGS
LDFLAGS="${LDFLAGS} -Wl,-z,defs"
AC_CACHE_CHECK([if linker supports -z,defs], [ac_cv_ld_z_defs], [
  AC_TRY_LINK([],, [
    ac_cv_ld_z_defs="yes"
  ], [
    ac_cv_ld_z_defs="no"
  ])
])
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AS_IF([test "${ac_cv_ld_z_defs}" = "no"], [VLC_RESTORE_FLAGS])
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dnl Check for __attribute__((packed))
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AC_CACHE_CHECK([for __attribute__((packed))],
  [ac_cv_c_attribute_packed],
  [ac_cv_c_attribute_packed=no
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   AC_TRY_COMPILE(, [struct __attribute__((__packed__)) foo { int a; } b; (void)b;],
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                    [ac_cv_c_attribute_packed=yes])])
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if test "${ac_cv_c_attribute_packed}" != "no"; then