[FFmpeg-devel] [PATCH v6 1/3] mips: improve detection of ISAs, FPU and ASEs (DSP, MSA)

[Michael Niedermayer]

On Thu, Jan 14, 2016 at 02:59:03PM +0000, Vicente Olivert Riera wrote:
> Signed-off-by: Vicente Olivert Riera <Vincent.Riera at imgtec.com>
> ---
> Changes v5 -> v6:
>  - Multiple changes:
>    - Use separate if blocks when detecting the MIPS ISA, this way when a block
>      disables one ISA it will be detected by the next one. Before the elif was
>      preventing this to be done.
>    - Don't use check_cflags and use only check_ldflags instead, which will
>      check if that flag is valid for compiling and linking. The compiler may
>      accept some cflags for compiling but not for linking, so if we check first
>      for the cflags it will succeed, and the cflags will be added to the CFLAGS
>      variable despite of the check_ldflags failing after that. This can cause
>      problems because of having multiple incompatible cflags enabled at the same
>      time.
>    - Check if mipsfpu has been disabled, and if so, then use -msoft-float. This
>      way we override the compiler default behavious which can be building for
>      hard-float.
>    - Explicitly disable the features that fail any check by adding "|| disable
>      $feature" at the end of the checks chain.
> 
> Changes v4 -> v5:
>  - Check for msa.h and disable msa if not found.
> 
> Changes v3 -> v4:
>  - Nothing.
> 
> Changes v2 -> v3:
>  - Nothing.
> 
> Changes v1 -> v2:
>  - Add a block of code for mipsdspr2 which was previously placed in the
>    first patch of this series causing a syntax error in the configure
>    script.
>    https://lists.ffmpeg.org/pipermail/ffmpeg-devel/2015-November/183444.html

make distclean ; ../configure --cross-prefix=/usr/mips-linux-gnu/bin/ --cc='ccache mips-linux-gnu-gcc-4.4' --arch=mips --target-os=linux --enable-cross-compile  --disable-mipsfpu && make -j12
results in pages of:

/usr/lib/gcc/mips-linux-gnu/4.4.5/../../../../mips-linux-gnu/bin/ld: Warning: libavfilter/filtfmts-test uses hard float, libswresample/libswresample.a(dither.o) uses soft float
/usr/lib/gcc/mips-linux-gnu/4.4.5/../../../../mips-linux-gnu/bin/ld: Warning: libavfilter/filtfmts-test uses hard float, libswresample/libswresample.a(resample.o) uses soft float
/usr/lib/gcc/mips-linux-gnu/4.4.5/../../../../mips-linux-gnu/bin/ld: Warning: libavfilter/filtfmts-test uses hard float, libswresample/libswresample.a(resample_dsp.o) uses soft float
/usr/lib/gcc/mips-linux-gnu/4.4.5/../../../../mips-linux-gnu/bin/ld: Warning: libavfilter/filtfmts-test uses hard float, libavutil/libavutil.a(adler32.o) uses soft float
/usr/lib/gcc/mips-linux-gnu/4.4.5/../../../../mips-linux-gnu/bin/ld: Warning: libavfilter/filtfmts-test uses hard float, libavutil/libavutil.a(aes.o) uses soft float
/usr/lib/gcc/mips-linux-gnu/4.4.5/../../../../mips-linux-gnu/bin/ld: Warning: libavfilter/filtfmts-test uses hard float, libavutil/libavutil.a(aes_ctr.o) uses soft float
/usr/lib/gcc/mips-linux-gnu/4.4.5/../../../../mips-linux-gnu/bin/ld: Warning: libavfilter/filtfmts-test uses hard float, libavutil/libavutil.a(audio_fifo.o) uses soft float


[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The worst form of inequality is to try to make unequal things equal.
-- Aristotle
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