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Avoids some code duplication.

Also drop the -mno-cygwin check since that option was removed back in 2008.

--disable-win32thread can be passed as an argument to configure to compile
with pthreads, which was the old default behavior.

Some compilers depending on target OS uses 4-byte stack alignment by default.
Explicitly check known good compilers and specific options for stack alignment.

Add Haiku as supported platform in configure.
Haiku has no nice() function, use the platform specific substitute instead.

Henrik Gramner authored Aug 11, 2015 and Anton Mitrofanov committed Aug 19, 2015

It makes more sense to tune the defaults to benefit the vast majority of users.

Anyone still using a Pentium III for video encoding is of course free to
explicitly set different flags when compiling.

Henrik Gramner authored Aug 10, 2015 and Anton Mitrofanov committed Aug 19, 2015

Use -fp:fast as a substitute for -ffast-math.
Increase warning level from -W0 to -W1 (the default setting).
Disable -GS (stack cookies) on MSVS. It's disabled by default on ICL.

Henrik Gramner authored Aug 12, 2015 and Anton Mitrofanov committed Aug 19, 2015

Fixes out-of-tree MSVS builds on Cygwin.

Henrik Gramner authored Aug 08, 2015 and Anton Mitrofanov committed Aug 19, 2015

`cl -showIncludes` creates absolute Windows paths for some files, attempt
to convert those to Unix paths.

Use relative paths for dependencies located in or below the working directory
in order to mimic the behavior of gcc and to make the paths more readable.

Make the dependency generation script a bit more robust in general.

Henrik Gramner authored Aug 08, 2015 and Anton Mitrofanov committed Aug 19, 2015

Also remove some non-POSIX syntax and improve robustness.

As a bonus the script now runs about 2-3 times faster.

`git rev-list --count` could be used to simplify things even further,
but that functionality was added in git 1.7.2 so keep `wc -l` for now
to maintain compatibility with older git versions.

Henrik Gramner authored Jul 26, 2015 and Anton Mitrofanov committed Aug 19, 2015

Avoids an irrelevant compatibility layer in Terminal Services environments.

https://msdn.microsoft.com/en-us/library/cc834995.aspx

Henrik Gramner authored Jul 26, 2015 and Anton Mitrofanov committed Aug 19, 2015

/usr/bin/link from coreutils may be located before the MSVS linker in $PATH
which causes linking to fail due to using the wrong binary.

GCC doesn't have an "-arch" switch, but works when that entire line is removed.

MSA is the MIPS SIMD Architecture.

Add X264_CPU_MSA define.
Update configure to detect MIPS platform and set flags.
CPU-specific gcc options are expected through --extra-cflags.

Sample command line for mips32r5:
    ./configure --host=mipsel-linux-gnu --cross-prefix=<TOOLCHAIN>/mips-mti-linux-gnu-
    --extra-cflags="-EL -mips32r5 -msched-weight -mload-store-pairs"
Signed-off-by: Kaustubh Raste <kaustubh.raste@imgtec.com>

Enables the use of nasm as an alternative to yasm.

Note that nasm cannot assemble x264 with PIC enabled since it currently doesn't
support [symbol-$$] addressing which is used extensively by x264's PIC code.
This includes all 64-bit Windows and 64-bit OS X builds, even non-shared.

For the above reason nasm is currently intentionally not auto-detected, instead
the assembler must be explicitly specified using "AS=nasm ./configure".

Also drop -O2 from ASFLAGS since it's simply ignored anyway.

PIC is always enabled when compiling for Windows so gcc complains when using
-fPIC since it doesn't do anything.

Update to the latest version of gas-preprocessor.pl from http://git.libav.org/?p=gas-preprocessor.git

Contributions by Janne Grunau, Martin Storsjo, Mans Rullgard, David Conrad, Martin Aumuller and others

The integrated assembler in llvm trunk (to be released as 3.5) is
otherwise capable enough to assemble the arm asm correctly.

The first MSVS compiler C99 compliant enough to build x264.
Use `CC=cl ./configure` to compile with it.

The warnings generated by -Wmaybe-uninitialized are mostly spurious.

This avoids a dependency on Perl to build OpenCL support.

SPARC has been obsolete for a long time and makes little sense as a
H.264 encoding platform.

Also update authors file.

libavcore was a never-released bad idea with a short lifespan.

This is how all other toolchain flags are handled.

Fixes some build warnings with clang.

Fixes Clang 3.4 compilation on OS X.

If the stack is known to be at least 32-byte aligned we can safely store ymm
registers on the stack without doing manual alignment.

Change ALLOC_STACK to always align the stack before allocating stack space for
consistency. Previously alignment would occur either before or after allocating
stack space depending on whether manual alignment was required or not.