[FFmpeg-devel] Build ffmpeg with clang lto

[Adrian Tong]

Hi Carl

This is the error message I get. It seems like libavdevice.a is llvm
bitcode.

Thanks
-Adrian

./configure --cc=clang --enable-lto && make -j28

AR libavcodec/libavcodec.a

LD ffmpeg_g

LD ffprobe_g

/usr/bin/ld: skipping incompatible libavdevice/libavdevice.a when searching
for -lavdevice

/usr/bin/ld: cannot find -lavdevice

/usr/bin/ld: skipping incompatible libavfilter/libavfilter.a when searching
for -lavfilter

/usr/bin/ld: cannot find -lavfilter

/usr/bin/ld: skipping incompatible libavformat/libavformat.a when searching
for /usr/bin/ld-lavformat

: skipping incompatible libavdevice/libavdevice.a when searching for
-lavdevice

/usr/bin/ld: cannot find -lavdevice

/usr/bin/ld: skipping incompatible libavfilter/libavfilter.a when searching
for -lavfilter

/usr/bin/ld: cannot find -lavfilter

/usr/bin/ld: skipping incompatible libavformat/libavformat.a when searching
for -lavformat

/usr/bin/ld: skipping incompatible libavcodec/libavcodec.a when searching
for -lavcodec

/usr/bin/ld: skipping incompatible libavcodec/libavcodec.a when searching
for -lavcodec

/usr/bin/ld: skipping incompatible libswresample/libswresample.a when
searching for -lswresample

/usr/bin/ld: skipping incompatible libswscale/libswscale.a when searching
for -lswscale

/usr/bin/ld: skipping incompatible libswresample/libswresample.a when
searching for -lswresample

/usr/bin/ld: skipping incompatible libavutil/libavutil.a when searching for
-lavutil

/usr/bin/ld: skipping incompatible libswscale/libswscale.a when searching
for -lswscale

/usr/bin/ld: skipping incompatible libavutil/libavutil.a when searching for
-lavutil

clang: *error: *linker command failed with exit code 1 (use -v to see
invocation)

clang: *error: *linker command failed with exit code 1 (use -v to see
invocation)

Makefile:111: recipe for target 'ffprobe_g' failed

On Sat, 1 Jun 2019 at 09:55, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:

> Am Sa., 1. Juni 2019 um 17:45 Uhr schrieb Adrian Tong
> <adriantong1024 at gmail.com>:
>
> > Anyone has experience compiling ffmpeg with clang LTO before ? I tried
> > ./configure --cc=clang --cxx=clang++ --enable-lto and it did not work.
>
> cxx should never be needed.
>
> "did not work" is not a useful problem description...
> (clang is definitely supported)
>
> Carl Eugen
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