configure.ac

])

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}"
])

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

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 "${with_sanitizer##*address*}" ], [
       AX_APPEND_COMPILE_FLAGS([-fsanitize-address-use-after-scope -fno-omit-frame-pointer -fsanitize=pointer-compare -fsanitize=pointer-subtract])
       AX_APPEND_COMPILE_FLAGS([-fsanitize-address-use-after-scope -fno-omit-frame-pointer -fsanitize=pointer-compare -fsanitize=pointer-subtract], [CXXFLAGS])
    ])
    AS_IF([test -z "${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])
    ])
])

dnl
dnl  Enable/disable optimizations
dnl
AC_ARG_ENABLE([optimizations],
  AS_HELP_STRING([--disable-optimizations],
    [disable compiler optimizations (default enabled)]),,
  [enable_optimizations="yes"])

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

  dnl -O3 only in production builds
  AS_IF([test "${enable_debug}" = "no"], [
    VLC_SAVE_FLAGS
    CFLAGS="${CFLAGS} -O3"
    CXXFLAGS="${CXXFLAGS} -O3"
    OBJCFLAGS="${OBJCFLAGS} -O3"
    AC_CACHE_CHECK([if $CC accepts -O3],  [ac_cv_c_o3], [
      AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [
        ac_cv_c_o3=yes
      ], [
        ac_cv_c_o3=no
      ])
    ])
    AS_IF([test "${ac_cv_c_o3}" = "no"], [VLC_RESTORE_FLAGS])
  ])

  dnl Check for fast maths
  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])

AH_BOTTOM([
#if defined(_MSC_VER) && !defined(__clang__)
# 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
#endif
])

  dnl Check for -funroll-loops
  VLC_SAVE_FLAGS
  CFLAGS="${CFLAGS} -funroll-loops"
  CXXFLAGS="${CXXFLAGS} -funroll-loops"
  OBJCFLAGS="${OBJCFLAGS} -funroll-loops"
  AC_CACHE_CHECK([if $CC accepts -funroll-loops], [ac_cv_c_unroll_loops], [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [
      ac_cv_c_unroll_loops=yes
    ], [
      ac_cv_c_unroll_loops=no
    ])
  ])
  AS_IF([test "${ac_cv_c_unroll_loops}" = "no"], [VLC_RESTORE_FLAGS])

  AS_IF([test "$enable_debug" = "no"], [
    dnl Check for -fomit-frame-pointer
    VLC_SAVE_FLAGS
    CFLAGS="${CFLAGS} -fomit-frame-pointer"
    CXXFLAGS="${CXXFLAGS} -fomit-frame-pointer"
    OBJCFLAGS="${OBJCFLAGS} -fomit-frame-pointer"
    AC_CACHE_CHECK([if $CC accepts -fomit-frame-pointer],
      [ac_cv_c_omit_frame_pointer], [
      AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [
        ac_cv_c_omit_frame_pointer=yes
      ], [
        ac_cv_c_omit_frame_pointer=no
      ])
    ])
    AS_IF([test "${ac_cv_c_omit_frame_pointer}" = "no"], [VLC_RESTORE_FLAGS])
  ])

])

AC_ARG_ENABLE([ssp],
  AS_HELP_STRING([--disable-ssp],
  [disable stack smashing protection (default enabled for optimized builds)]), [],
  [enable_ssp="yes"])

AS_IF([test "${enable_ssp}" != "no" -a "${enable_optimizations}" != "no"], [
  VLC_SAVE_FLAGS
  AX_APPEND_COMPILE_FLAGS([-fstack-protector-strong])
  AX_APPEND_COMPILE_FLAGS([-fstack-protector-strong], [CXXFLAGS])
  dnl Win32 requires linking to ssp for stack-protection
  AS_IF([test "${SYS}" = "mingw32"], [
      LDFLAGS="${LDFLAGS} -lssp"
      AC_CACHE_CHECK([if linker supports stack protectors], [ac_cv_ld_ssp], [
        AC_TRY_LINK([#include <stdio.h>],[char buf[100]; fgets(buf, sizeof(buf), stdin);], [
          ac_cv_ld_ssp="yes"
        ], [
          ac_cv_ld_ssp="no"
        ])
      ])
      AS_IF([test "${ac_cv_ld_ssp}" = "no"], [VLC_RESTORE_FLAGS])
  ])
])

AS_IF([test "${SYS}" = "mingw32"], [
    dnl library for BCrypt APIs
    AS_IF([test "${vlc_winstore_app}" = 1],
          [LDFLAGS="${LDFLAGS} -lbcrypt"])
])

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])

VLC_SAVE_FLAGS
LDFLAGS="${LDFLAGS} -Wl,-z,defs"
AC_CACHE_CHECK([if linker supports -z,defs], [ac_cv_ld_z_defs], [
  AC_TRY_LINK([],, [
    ac_cv_ld_z_defs="yes"
  ], [
    ac_cv_ld_z_defs="no"
  ])
])
AS_IF([test "${ac_cv_ld_z_defs}" = "no"], [VLC_RESTORE_FLAGS])

dnl Check for __attribute__((packed))
AC_CACHE_CHECK([for __attribute__((packed))],
  [ac_cv_c_attribute_packed],
  [ac_cv_c_attribute_packed=no
   AC_TRY_COMPILE(, [struct __attribute__((__packed__)) foo { int a; } b; (void)b;],
                    [ac_cv_c_attribute_packed=yes])])
if test "${ac_cv_c_attribute_packed}" != "no"; then
  AC_DEFINE(HAVE_ATTRIBUTE_PACKED, 1, Support for __attribute__((packed)) for structs)
fi

dnl
dnl  Check the CPU
dnl
case "${host_cpu}" in
  "")
    ARCH=unknown
    ;;
  armv*)
    ARCH="arm"
    host_cpu="arm"
    ;;
  *)
    ARCH="${host_cpu}"
    ;;
esac

dnl Check for backtrace() support
AC_CHECK_HEADERS([execinfo.h])
AC_CHECK_FUNCS([backtrace])

dnl
dnl  default modules
dnl
ALIASES="${ALIASES} cvlc rvlc"

dnl
dnl  Accelerated modules
dnl

dnl  Check for fully working MMX intrinsics
dnl  We need support for -mmmx, we need <mmintrin.h>, and we also need a
dnl  working compiler (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23963)
AC_ARG_ENABLE([mmx],
  AS_HELP_STRING([--disable-mmx],
    [disable MMX optimizations (default auto)]),,[
  case "${host_cpu}" in
    i?86|x86_64)
      enable_mmx="yes"
      ;;
    *)
      enable_mmx="no"
      ;;
  esac
])
have_mmx="no"
have_mmxext="no"
AS_IF([test "${enable_mmx}" != "no"], [
  ARCH="${ARCH} mmx"
  VLC_SAVE_FLAGS
  CFLAGS="${CFLAGS} -mmmx"
  AC_CACHE_CHECK([if $CC groks MMX intrinsics], [ac_cv_c_mmx_intrinsics], [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
[#include <mmintrin.h>
#include <stdint.h>
uint64_t frobzor;]], [
[__m64 a, b, c;
a = b = c = (__m64)frobzor;
a = _mm_slli_pi16(a, 3);
a = _mm_adds_pi16(a, b);
c = _mm_srli_pi16(c, 8);
c = _mm_slli_pi16(c, 3);
b = _mm_adds_pi16(b, c);
a = _mm_unpacklo_pi8(a, b);
frobzor = (uint64_t)a;]])], [
      ac_cv_c_mmx_intrinsics=yes
    ], [
      ac_cv_c_mmx_intrinsics=no
    ])
  ])
  VLC_RESTORE_FLAGS
  AS_IF([test "${ac_cv_c_mmx_intrinsics}" != "no"], [
    AC_DEFINE(HAVE_MMX_INTRINSICS, 1, [Define to 1 if MMX intrinsics are available.])
  ])

  VLC_SAVE_FLAGS
  CFLAGS="${CFLAGS} -mmmx"
  AC_CACHE_CHECK([if $CC groks MMX inline assembly], [ac_cv_mmx_inline], [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,[[
void *p;
asm volatile("packuswb %%mm1,%%mm2"::"r"(p):"mm1", "mm2");
]])
    ], [
      ac_cv_mmx_inline=yes
    ], [
      ac_cv_mmx_inline=no
    ])
  ])
  AS_IF([test "${ac_cv_mmx_inline}" != "no"], [
    AC_DEFINE(CAN_COMPILE_MMX, 1, [Define to 1 inline MMX assembly is available.])
    have_mmx="yes"
  ])

  AC_CACHE_CHECK([if $CC groks MMX EXT inline assembly],
                 [ac_cv_mmxext_inline], [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,[[
void *p;
asm volatile("maskmovq %%mm1,%%mm2"::"r"(p):"mm1", "mm2");
]])
    ], [
      ac_cv_mmxext_inline=yes
    ], [
      ac_cv_mmxext_inline=no
    ])
  ])
  VLC_RESTORE_FLAGS
  AS_IF([test "${ac_cv_mmxext_inline}" != "no"], [
    AC_DEFINE(CAN_COMPILE_MMXEXT, 1, [Define to 1 if MMX EXT inline assembly is available.])
    have_mmxext="yes"
  ])
])
AM_CONDITIONAL([HAVE_MMX], [test "${have_mmx}" = "yes"])
AM_CONDITIONAL([HAVE_MMXEXT], [test "${have_mmxext}" = "yes"])

dnl  Check for fully workin SSE2 intrinsics
dnl  We need support for -mmmx, we need <emmintrin.h>, and we also need a
dnl  working compiler (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23963)
AC_ARG_ENABLE([sse],
  AS_HELP_STRING([--disable-sse],
    [disable SSE (1-4) optimizations (default auto)]),, [
  case "${host_cpu}" in
    i?86|x86_64)
      enable_sse=yes
      ;;
    *)
      enable_sse=no
      ;;
  esac
])
have_sse2="no"
AS_IF([test "${enable_sse}" != "no"], [
  ARCH="${ARCH} sse sse2"

  VLC_SAVE_FLAGS
  CFLAGS="${CFLAGS} -msse2"
  AC_CACHE_CHECK([if $CC groks SSE2 intrinsics], [ac_cv_c_sse2_intrinsics], [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
[#include <emmintrin.h>
#include <stdint.h>
uint64_t frobzor;]], [
[__m128i a, b, c;
a = b = c = _mm_set1_epi64((__m64)frobzor);
a = _mm_slli_epi16(a, 3);
a = _mm_adds_epi16(a, b);
c = _mm_srli_epi16(c, 8);
c = _mm_slli_epi16(c, 3);
b = _mm_adds_epi16(b, c);
a = _mm_unpacklo_epi8(a, b);
frobzor = (uint64_t)_mm_movepi64_pi64(a);]])], [
      ac_cv_c_sse2_intrinsics=yes
    ], [
      ac_cv_c_sse2_intrinsics=no
    ])
  ])
  VLC_RESTORE_FLAGS
  AS_IF([test "${ac_cv_c_sse2_intrinsics}" != "no"], [
    AC_DEFINE(HAVE_SSE2_INTRINSICS, 1, [Define to 1 if SSE2 intrinsics are available.])
  ])

  VLC_SAVE_FLAGS
  CFLAGS="${CFLAGS} -msse"
  AC_CACHE_CHECK([if $CC groks SSE inline assembly], [ac_cv_sse_inline], [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,[[
void *p;
asm volatile("xorps %%xmm1,%%xmm2"::"r"(p):"xmm1", "xmm2");
]])
    ], [
      ac_cv_sse_inline=yes
    ], [
      ac_cv_sse_inline=no
    ])
  ])

  AS_IF([test "${ac_cv_sse_inline}" != "no" -a "${SYS}" != "solaris"], [
    AC_DEFINE(CAN_COMPILE_SSE, 1, [Define to 1 if SSE inline assembly is available.])
  ])

  AC_CACHE_CHECK([if $CC groks SSE2 inline assembly], [ac_cv_sse2_inline], [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,[[
void *p;
asm volatile("punpckhqdq %%xmm1,%%xmm2"::"r"(p):"xmm1", "xmm2");
]])
    ], [
      ac_cv_sse2_inline=yes
    ], [
      ac_cv_sse2_inline=no
    ])
  ])
  AS_IF([test "${ac_cv_sse2_inline}" != "no" -a "${SYS}" != "solaris"], [
    AC_DEFINE(CAN_COMPILE_SSE2, 1, [Define to 1 if SSE2 inline assembly is available.])
    have_sse2="yes"
  ])

  # SSE3
  AC_CACHE_CHECK([if $CC groks SSE3 inline assembly], [ac_cv_sse3_inline], [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,[[
void *p;
asm volatile("movsldup %%xmm1,%%xmm0"::"r"(p):"xmm0", "xmm1");
]])
    ], [
      ac_cv_sse3_inline=yes
    ], [
      ac_cv_sse3_inline=no
    ])
  ])

  AS_IF([test "${ac_cv_sse3_inline}" != "no"], [
    AC_DEFINE(CAN_COMPILE_SSE3, 1, [Define to 1 if SSE3 inline assembly is available.]) ])
  # SSSE3
  AC_CACHE_CHECK([if $CC groks SSSE3 inline assembly], [ac_cv_ssse3_inline], [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,[[
void *p;
asm volatile("pabsw %%xmm0,%%xmm0"::"r"(p):"xmm0");
]])
    ], [
      ac_cv_ssse3_inline=yes
    ], [
      ac_cv_ssse3_inline=no
    ])
  ])

  AS_IF([test "${ac_cv_ssse3_inline}" != "no"], [
    AC_DEFINE(CAN_COMPILE_SSSE3, 1, [Define to 1 if SSSE3 inline assembly is available.]) ])

  # SSE4.1
  AC_CACHE_CHECK([if $CC groks SSE4.1 inline assembly],
                 [ac_cv_sse4_1_inline], [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,[[
void *p;
asm volatile("pmaxsb %%xmm1,%%xmm0"::"r"(p):"xmm0", "xmm1");
]])
    ], [
      ac_cv_sse4_1_inline=yes
    ], [
      ac_cv_sse4_1_inline=no
    ])
  ])

  AS_IF([test "${ac_cv_sse4_1_inline}" != "no"], [
    AC_DEFINE(CAN_COMPILE_SSE4_1, 1, [Define to 1 if SSE4_1 inline assembly is available.]) ])

  # SSE4.2
  AC_CACHE_CHECK([if $CC groks SSE4.2 inline assembly],
                 [ac_cv_sse4_2_inline], [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,[[
void *p;
asm volatile("pcmpgtq %%xmm1,%%xmm0"::"r"(p):"xmm0", "xmm1");
]])
    ], [
      ac_cv_sse4_2_inline=yes
    ], [
      ac_cv_sse4_2_inline=no
    ])
  ])

  AS_IF([test "${ac_cv_sse4_2_inline}" != "no"], [
    AC_DEFINE(CAN_COMPILE_SSE4_2, 1, [Define to 1 if SSE4_2 inline assembly is available.]) ])

  # SSE4A
  AC_CACHE_CHECK([if $CC groks SSE4A inline assembly], [ac_cv_sse4a_inline], [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,[[
void *p;
asm volatile("insertq %%xmm1,%%xmm0"::"r"(p):"xmm0", "xmm1");
]])
    ], [
      ac_cv_sse4a_inline=yes
    ], [
      ac_cv_sse4a_inline=no
    ])
  ])
  VLC_RESTORE_FLAGS
  AS_IF([test "${ac_cv_sse4a_inline}" != "no"], [
    AC_DEFINE([CAN_COMPILE_SSE4A], [1], [Define to 1 if SSE4A inline assembly is available.]) ])
])
AM_CONDITIONAL([HAVE_SSE2], [test "$have_sse2" = "yes"])

VLC_SAVE_FLAGS
CFLAGS="${CFLAGS} -mmmx"
have_3dnow="no"
AC_CACHE_CHECK([if $CC groks 3D Now! inline assembly], [ac_cv_3dnow_inline], [
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,[[
void *p;
asm volatile("pfadd %%mm1,%%mm2"::"r"(p):"mm1", "mm2");
]])
  ], [
    ac_cv_3dnow_inline=yes
  ], [
    ac_cv_3dnow_inline=no
  ])
])
VLC_RESTORE_FLAGS
AS_IF([test "${ac_cv_3dnow_inline}" != "no"], [
  AC_DEFINE([CAN_COMPILE_3DNOW], 1,
            [Define to 1 if 3D Now! inline assembly is available.])
  have_3dnow="yes"
])
AM_CONDITIONAL([HAVE_3DNOW], [test "$have_3dnow" = "yes"])


AC_ARG_ENABLE([neon],
  AS_HELP_STRING([--disable-neon],
    [disable ARM NEON optimizations (default auto)]),, [
  case "${host_cpu}" in
    "arm")
      enable_neon="32"
      ;;
    "aarch64")
      enable_neon="64"
      ;;
    *)
      enable_neon="no"
      ;;
  esac
])
AS_IF([test "${enable_neon}" != "no"], [
  VLC_SAVE_FLAGS
  AC_CACHE_CHECK([if $CCAS groks ARM NEON assembly], [ac_cv_arm_neon], [
    AS_IF([test "${enable_neon}" != "64"], [
      CFLAGS="${CFLAGS} -mfpu=neon -mhard-float"
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM(,[[
asm volatile("vqmovun.s64 d0, q1":::"d0");
]])
      ], [
        ac_cv_arm_neon="32"
      ], [
        ac_cv_arm_neon="no"
      ])
    ], [
      CFLAGS="${CFLAGS} -march=armv8-a+simd"
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM(,[[
asm volatile("uhadd v0.8b, v0.8b, v1.8b":::"v0");
]])
      ], [
        ac_cv_arm_neon="64"
      ], [
        ac_cv_arm_neon="no"
      ])
    ])
  ])
  VLC_RESTORE_FLAGS
])
AM_CONDITIONAL([HAVE_NEON], [test "${ac_cv_arm_neon}" = "32"])
AM_CONDITIONAL([HAVE_ARM64], [test "${ac_cv_arm_neon}" = "64"])

AC_ARG_ENABLE([sve],
  AS_HELP_STRING([--disable-sve],
    [disable ARM SVE optimizations (default auto)]),, [
  AS_IF([test "${host_cpu}" = "aarch64"], [enable_sve="yes"] ,[enable_sve="no"])
])
AS_IF([test "${enable_sve}" != "no"], [
  VLC_SAVE_FLAGS
  CFLAGS="${CFLAGS} -march=armv8-a+sve"
  AC_CACHE_CHECK([if $CCAS groks ARM SVE assembly], [ac_cv_arm_sve], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM(,[[
asm volatile("ptrue p0.s" ::: "p0");
]])
    ], [
      ac_cv_arm_sve="yes"
    ], [
      ac_cv_arm_sve="no"
    ])
  ])
  VLC_RESTORE_FLAGS
])
AM_CONDITIONAL([HAVE_SVE], [test "${ac_cv_arm_sve}" = "yes"])


AC_ARG_ENABLE([altivec],
  AS_HELP_STRING([--disable-altivec],
    [disable AltiVec optimizations (default auto)]),, [
  AS_CASE("${host_cpu}", [powerpc*],
        [enable_altivec=yes], [enable_altivec=no])
])
have_altivec="no"
ALTIVEC_CFLAGS=""
AS_IF([test "${enable_altivec}" = "yes"], [
  ARCH="${ARCH} altivec";
  VLC_SAVE_FLAGS
  AC_CACHE_CHECK([if $CC groks AltiVec inline assembly],
    [ac_cv_altivec_inline],
    [AC_TRY_COMPILE(,[asm volatile("vperm 0,1,2,3");],
         ac_cv_altivec_inline="yes",
         [CFLAGS="${CFLAGS} -Wa,-maltivec"
          AC_TRY_COMPILE(,[asm volatile("vperm 0,1,2,3");],
            [ac_cv_altivec_inline="-Wa,-maltivec"],
            ac_cv_altivec_inline=no)
         ])])
  VLC_RESTORE_FLAGS
  AS_IF([test "${ac_cv_altivec_inline}" != "no"], [
    AC_DEFINE(CAN_COMPILE_ALTIVEC, 1,
              [Define to 1 if AltiVec inline assembly is available.])
    AS_IF([test "${ac_cv_altivec_inline}" != "yes"], [
      ALTIVEC_CFLAGS="${ac_cv_altivec_inline}"
      VLC_ADD_CFLAGS([libvlccore],[${ac_cv_altivec_inline}])
    ])
    have_altivec="yes"
  ])

  VLC_SAVE_FLAGS
  AC_CACHE_CHECK([if \$CC groks AltiVec C extensions],
  [ac_cv_c_altivec], [
    CFLAGS="${CFLAGS} -maltivec"
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
[#include <altivec.h>]], [
[vec_ld(0, (unsigned char *)0);]])], [
      ac_cv_c_altivec="-maltivec"
    ], [
      ac_cv_c_altivec="no"
    ])
  ])
  VLC_RESTORE_FLAGS
  AS_IF([test "${ac_cv_c_altivec}" != "no"], [
    CPPFLAGS="${CPPFLAGS} ${ac_cv_c_altivec}"
    AC_DEFINE(CAN_COMPILE_C_ALTIVEC, 1, [Define to 1 if C AltiVec extensions are available.])
    VLC_ADD_CFLAGS([libvlccore],[${ac_cv_c_altivec}])
    ALTIVEC_CFLAGS="$ALTIVEC_CFLAGS ${ac_cv_c_altivec}"
    VLC_ADD_CFLAGS([deinterlace],[${ac_cv_c_altivec}])
    have_altivec="yes"
  ])
  AC_CHECK_HEADERS([altivec.h])

  VLC_SAVE_FLAGS
  LDFLAGS="${LDFLAGS} -Wl,-framework,vecLib"
  AC_CACHE_CHECK([if linker needs -framework vecLib],
    [ac_cv_ld_altivec],
    [AC_TRY_LINK([],,ac_cv_ld_altivec=yes,ac_cv_ld_altivec=no)])
  VLC_RESTORE_FLAGS
  AS_IF([test "${ac_cv_ld_altivec}" != "no"], [
    VLC_ADD_LIBS([libvlccore],[-Wl,-framework,vecLib])
  ])
])
AC_SUBST([ALTIVEC_CFLAGS])
AM_CONDITIONAL([HAVE_ALTIVEC], [test "$have_altivec" = "yes"])

dnl
dnl  Memory usage
dnl
AC_ARG_ENABLE([optimize-memory],
  AS_HELP_STRING([--enable-optimize-memory],
    [optimize memory usage over performance]))
if test "${enable_optimize_memory}" = "yes"; then
  AC_DEFINE(OPTIMIZE_MEMORY, 1, Define if you want to optimize memory usage over performance)
fi

dnl
dnl Allow running as root (useful for people running on embedded platforms)
dnl
AC_ARG_ENABLE([run-as-root],
  AS_HELP_STRING([--enable-run-as-root],
    [allow running VLC as root (default disabled)]))
AS_IF([test "${enable_run_as_root}" = "yes"],[
    AC_DEFINE(ALLOW_RUN_AS_ROOT, 1,
              [Define to 1 to allow running VLC as root (uid 0).])
])

dnl
dnl Stream output
dnl
AC_ARG_ENABLE([sout],
  AS_HELP_STRING([--disable-sout],
    [disable streaming output (default enabled)]))
AS_IF([test "${enable_sout}" != "no"], [
  AC_DEFINE(ENABLE_SOUT, 1, [Define to 1 for stream output support.])
])
AM_CONDITIONAL([ENABLE_SOUT], [test "${enable_sout}" != "no"])

dnl Lua modules
AC_ARG_ENABLE([lua],
  AS_HELP_STRING([--disable-lua],
    [disable LUA scripting support (default enabled)]))
if test "${enable_lua}" != "no"
then
  PKG_CHECK_MODULES(LUA, lua5.2,
    [ have_lua=yes ],
    [
    AC_MSG_WARN([${LUA_PKG_ERRORS}, trying lua 5.1 instead])

    PKG_CHECK_MODULES(LUA, lua5.1,
      [ have_lua=yes ],
      [
      AC_MSG_WARN([${LUA_PKG_ERRORS}, trying lua >= 5.1 instead])
      PKG_CHECK_MODULES(LUA, lua >= 5.1,
        [ have_lua=yes ],
        [
          AC_MSG_WARN([${LUA_PKG_ERRORS}, trying manual detection instead])
          have_lua=yes
          AC_CHECK_HEADERS([lua.h lauxlib.h lualib.h],
            [],
            [ have_lua=no ] )
          AC_CHECK_LIB(  lua5.2 , luaL_newstate,
            [LUA_LIBS="-llua5.2"],
          AC_CHECK_LIB( lua5.1 , luaL_newstate,
            [LUA_LIBS="-llua5.1"],
            AC_CHECK_LIB( lua51 , luaL_newstate,
              [LUA_LIBS="-llua51"],
              AC_CHECK_LIB( lua , luaL_newstate,
                [LUA_LIBS="-llua"],
                [ have_lua=no
                ], [-lm])
            )))
        ])
      ])
    ])
  if test "x${have_lua}" != "xyes" ;  then
      AC_MSG_ERROR([Could not find lua. Lua is needed for some interfaces (rc, telnet, http) as well as many other custom scripts. Use --disable-lua to ignore this error.])
  fi
  AC_ARG_VAR([LUAC], [LUA byte compiler])
  AS_IF([test -z "$LUAC"], [
     AC_CHECK_TOOL(LUAC, [luac], [false])
  ])
  AS_IF([test "${LUAC}" = "false"], [
    AC_MSG_ERROR([Could not find the LUA byte compiler.])
  ])
  AS_IF([test -d "${CONTRIB_DIR}" -a -f "${CONTRIB_DIR}/lib/liblua.a" -a `echo|${LUAC} -o - -|od -j 8 -N 2 -t x2|head -n 1|tr -s ' '|cut -d' ' -f2` != 0404], [
    AC_MSG_ERROR([You need 32-bits luac when using lua from contrib.])
  ])
fi
AM_CONDITIONAL([BUILD_LUA], [test "${have_lua}" = "yes"])


dnl
dnl VideoLAN manager
dnl
AC_ARG_ENABLE([vlm],
  AS_HELP_STRING([--disable-vlm],
    [disable the stream manager (default enabled)]),,
  [enable_vlm="${enable_sout}"])
AS_IF([test "${enable_vlm}" != "no"], [
  AS_IF([test "${enable_sout}" = "no"], [
    AC_MSG_ERROR([VLM requires the stream output. Do not use --disable-sout.])
  ])
  AC_DEFINE(ENABLE_VLM, 1, [Define if you want the VideoLAN manager support])
])
AM_CONDITIONAL([ENABLE_VLM], [test "${enable_vlm}" != "no"])


dnl
dnl Addons manager storage and repositories modules
dnl
AC_ARG_ENABLE([addonmanagermodules],
  AS_HELP_STRING([--disable-addonmanagermodules],
    [disable the addons manager modules (default enabled)]))
if test "${enable_addonmanagermodules}" != "no"
then
  AC_DEFINE(ENABLE_ADDONMANAGERMODULES, 1, [Define if you want the addons manager modules])
fi
AM_CONDITIONAL([ENABLE_ADDONMANAGERMODULES], [test "${enable_addonmanagermodules}" != "no"])


dnl
dnl  Input plugins
dnl

EXTEND_HELP_STRING([Input plugins:])

dnl
dnl  libarchive access module
dnl
PKG_ENABLE_MODULES_VLC([ARCHIVE], [archive], [libarchive >= 3.1.0], (libarchive support), [auto])

dnl
dnl  live555 input
dnl
AC_ARG_ENABLE([live555],
  AS_HELP_STRING([--enable-live555],
    [enable RTSP input through live555 (default enabled)]))

AS_IF([test "${enable_live555}" != "no" -a -n "${CXX}"], [
  PKG_CHECK_MODULES(LIVE555, live555, [
    VLC_ADD_PLUGIN([live555])
    VLC_ADD_CXXFLAGS([live555], [$LIVE555_CFLAGS])
    VLC_ADD_LIBS([live555],[$LIVE555_LIBS])
  ], [
    AC_MSG_WARN([${LIVE555_PKG_ERRORS}.])

    AC_LANG_PUSH(C++)
    VLC_SAVE_FLAGS

    dnl detect include paths
    AS_IF([test -f "${CONTRIB_DIR}/include/UsageEnvironment/UsageEnvironment.hh"], [
      CPPFLAGS_live555="-I${CONTRIB_DIR}/include/liveMedia -I${CONTRIB_DIR}/include/groupsock -I${CONTRIB_DIR}/include/BasicUsageEnvironment -I${CONTRIB_DIR}/include/UsageEnvironment"
    ], [
      AS_IF([test "${SYS}" != "os2"], [
        LIVE555_PREFIX=${LIVE555_PREFIX-"/usr"}
        CPPFLAGS_live555="-I${LIVE555_PREFIX}/include/liveMedia -I${LIVE555_PREFIX}/include/groupsock -I${LIVE555_PREFIX}/include/BasicUsageEnvironment -I${LIVE555_PREFIX}/include/UsageEnvironment"
      ], [
        LIVE555_PREFIX=${LIVE555_PREFIX-"/usr/lib/live"}
        CPPFLAGS_live555="-I${LIVE555_PREFIX}/liveMedia/include -I${LIVE555_PREFIX}/groupsock/include -I${LIVE555_PREFIX}/BasicUsageEnvironment/include -I${LIVE555_PREFIX}/UsageEnvironment/include"
        LDFLAGS_live555="-L${LIVE555_PREFIX}/liveMedia -L${LIVE555_PREFIX}/groupsock -L${LIVE555_PREFIX}/BasicUsageEnvironment -L${LIVE555_PREFIX}/UsageEnvironment"
      ])
    ])

    dnl CPP Flags
    AS_IF([test "${SYS}" = "solaris"], [
      CPPFLAGS_live555="${CPPFLAGS_live555} -DSOLARIS"
    ])
    CPPFLAGS="${CPPFLAGS} ${CPPFLAGS_live555}"
    LDFLAGS="${LDFLAGS} ${LDFLAGS_live555}"

    dnl version check
    AC_CACHE_CHECK([for live555 version 1324598400 or later], [ac_cv_live555], [
      AC_PREPROC_IFELSE([AC_LANG_PROGRAM([
[#include <liveMedia_version.hh>
#if !defined (LIVEMEDIA_LIBRARY_VERSION_INT) || (LIVEMEDIA_LIBRARY_VERSION_INT < 1324598400)
# error BOOM
#endif]])
      ], [
        ac_cv_live555="yes"
      ], [
        ac_cv_live555="no"
      ])
    ])

    AS_IF([test "$ac_cv_live555" = "no"], [
      AC_MSG_WARN([live555 is missing or its installed version is too old:
Version 2011.12.23 or later is required to proceed.
You can get an updated one from http://www.live555.com/liveMedia .])
      AS_IF([test -n "${enable_live555}"], [
        AC_MSG_ERROR([Update live555 or pass --disable-live555 to disable RTSP input support.])
      ])
    ], [
      other_libs="-lgroupsock -lBasicUsageEnvironment -lUsageEnvironment"
      other_libs_pic="-lgroupsock_pic -lBasicUsageEnvironment_pic -lUsageEnvironment_pic"
      AS_IF([test "${SYS}" = "mingw32"], [
        # add ws2_32 for closesocket, select, recv
        other_libs="$other_libs -lws2_32"
      ])

      dnl We need to check for pic because live555 don't provide shared libs
      dnl and we want to build a plugins so we need -fPIC on some arch.
      VLC_ADD_CXXFLAGS([live555], [${CPPFLAGS_live555}])
      VLC_ADD_LDFLAGS([live555], [${LDFLAGS_live555}])
      AC_CHECK_LIB([liveMedia_pic], [main], [
        VLC_ADD_PLUGIN([live555])
        VLC_ADD_LIBS([live555], [-lliveMedia_pic ${other_libs_pic}])
      ],[
        AC_CHECK_LIB([liveMedia], [main], [
          VLC_ADD_PLUGIN([live555])
          VLC_ADD_LIBS([live555], [-lliveMedia ${other_libs}])
        ],[],[${other_libs}])
      ],[${other_libs_pic}])
    ])
    VLC_RESTORE_FLAGS
    AC_LANG_POP(C++)
  ])
])

dnl
dnl IIDC and DV FireWire input modules
dnl
PKG_ENABLE_MODULES_VLC([DC1394], [], [libdc1394-2 >= 2.1.0], [IIDC FireWire input module], [auto])
PKG_ENABLE_MODULES_VLC([DV1394], [], [libraw1394 >= 2.0.1 libavc1394 >= 0.5.3], [DV FireWire input module], [auto])

dnl
dnl - linsys modules: access module check for libzvbi
dnl
AC_ARG_ENABLE([linsys],
  AS_HELP_STRING([--enable-linsys],
    [Linux Linear Systems Ltd. SDI and HD-SDI input cards (default enabled)]))
AS_IF([test "$SYS" = "linux" -a "${enable_linsys}" != "no"], [
  VLC_ADD_PLUGIN([linsys_hdsdi])
  PKG_CHECK_MODULES(LINSYS_SDI, [zvbi-0.2 >= 0.2.28], [
    VLC_ADD_PLUGIN([linsys_sdi])
  ], [
    AC_MSG_WARN([${LINSYS_SDI_PKG_ERRORS}.])
  ])
])

dnl
dnl dvdread module: check for libdvdread
dnl
PKG_ENABLE_MODULES_VLC([DVDREAD], [], [dvdread > 6.0.0], [dvdread input module], [auto])

dnl
dnl libdvdnav plugin
dnl
PKG_ENABLE_MODULES_VLC([DVDNAV], [], [dvdnav >= 6.0.0], [DVD with navigation input module (dvdnav)], [auto])

dnl
dnl  Blu-ray Disc Support with libbluray
dnl
PKG_ENABLE_MODULES_VLC([BLURAY], [libbluray], [libbluray >= 0.6.2], (libbluray for Blu-ray disc support ) )

dnl
dnl  OpenCV wrapper and example filters
dnl
PKG_ENABLE_MODULES_VLC([OPENCV], [opencv_example opencv_wrapper], [opencv > 2.0], (OpenCV (computer vision) filter), [auto])


dnl
dnl  libsmbclient plugin
dnl
PKG_ENABLE_MODULES_VLC([SMBCLIENT], [smbc], [smbclient], (SMB/CIFS support), [auto])

dnl
dnl  liBDSM access module
dnl
AM_CONDITIONAL([HAVE_DSM], [test "$AS_TR_SH(with_dsm)" = "yes"])
PKG_WITH_MODULES([DSM], [libdsm >= 0.2.0], [
       VLC_ADD_PLUGIN([dsm])
       VLC_ADD_CFLAGS([dsm], [$DSM_CFLAGS])
       VLC_ADD_LIBS([dsm], [$DSM_LIBS])
       have_dsm="yes"
   ],,[libdsm SMB/CIFS access/sd module], [auto])
AM_CONDITIONAL([HAVE_DSM], [test "${have_dsm}" = "yes"])

dnl
dnl sftp access support
dnl
PKG_ENABLE_MODULES_VLC([SFTP], [sftp], [libssh2], (support SFTP file transfer via libssh2), [auto])

dnl
dnl nfs access support
dnl
PKG_ENABLE_MODULES_VLC([NFS], [nfs], [libnfs >= 1.10.0], (support nfs protocol via libnfs), [auto])

dnl
dnl smb2 access support
dnl
PKG_ENABLE_MODULES_VLC([SMB2], [smb2], [libsmb2 >= 2.0.0], (support smb2 protocol via libsmb2), [auto])

dnl
dnl  Video4Linux 2
dnl
AC_ARG_ENABLE([v4l2], AS_HELP_STRING([--disable-v4l2],
  [disable Video4Linux version 2 (default auto)]))
have_v4l2="no"
AS_IF([test "$enable_v4l2" != "no"], [
  AC_CHECK_HEADERS([linux/videodev2.h], [
    have_v4l2="yes"
  ])
])
AM_CONDITIONAL([HAVE_V4L2], [test "${have_v4l2}" != "no"])

dnl
dnl special access module for Blackmagic SDI cards
dnl
AC_ARG_ENABLE([decklink],
  AS_HELP_STRING([--disable-decklink],
    [disable Blackmagic DeckLink SDI input (default auto)]))
AC_ARG_WITH([decklink_sdk],
  AS_HELP_STRING([--with-decklink-sdk=DIR],
    [location of Blackmagic DeckLink SDI SDK]))
have_decklink=no
if test "${enable_decklink}" != "no"
then
  if test "${with_decklink_sdk}" != "no" -a -n "${with_decklink_sdk}"
  then
    VLC_ADD_CPPFLAGS([decklink decklinkoutput stream_out_sdi],[-I${with_decklink_sdk}/include])
  fi
  VLC_SAVE_FLAGS
  CPPFLAGS="${CPPFLAGS} ${CPPFLAGS_decklink}"
  AC_LANG_PUSH([C++])
  AC_CHECK_HEADERS([DeckLinkAPIDispatch.cpp], [
      have_decklink=yes
      AS_IF([test "${SYS}" = "darwin"], [
        VLC_ADD_LIBS([decklink decklinkoutput],[-Wl,-framework,CoreFoundation])
      ])
  ], [
      AS_IF([test "${enable_decklink}" = "yes"], [
        AC_MSG_ERROR([Blackmagic DeckLink SDI include files not found!])
      ], [
        AC_MSG_WARN([Blackmagic DeckLink SDI include files not found, decklink disabled])
      ])
  ])
  AC_LANG_POP([C++])
  VLC_RESTORE_FLAGS
fi
AM_CONDITIONAL([HAVE_DECKLINK], [ test "${have_decklink}" != "no" ])