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configure: link to libatomic when it's present

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C11 atomics in some configurations (e.g. 64bit operations on ppc64 with
GCC) require linking to libatomic.

Fixes #9275
This commit is contained in:
Anton Khirnov 2022-01-19 12:50:41 +01:00
parent 9e4693a1cb
commit 2f0a214a62
1 changed files with 16 additions and 9 deletions
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25
configure vendored
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@ -3795,20 +3795,20 @@ cws2fws_extralibs="zlib_extralibs"
# libraries, in any order
avcodec_deps="avutil"
avcodec_suggest="libm"
avcodec_suggest="libm stdatomic"
avdevice_deps="avformat avcodec avutil"
avdevice_suggest="libm"
avdevice_suggest="libm stdatomic"
avfilter_deps="avutil"
avfilter_suggest="libm"
avfilter_suggest="libm stdatomic"
avformat_deps="avcodec avutil"
avformat_suggest="libm network zlib"
avutil_suggest="clock_gettime ffnvcodec libm libdrm libmfx opencl user32 vaapi vulkan videotoolbox corefoundation corevideo coremedia bcrypt"
avformat_suggest="libm network zlib stdatomic"
avutil_suggest="clock_gettime ffnvcodec libm libdrm libmfx opencl user32 vaapi vulkan videotoolbox corefoundation corevideo coremedia bcrypt stdatomic"
postproc_deps="avutil gpl"
postproc_suggest="libm"
postproc_suggest="libm stdatomic"
swresample_deps="avutil"
swresample_suggest="libm libsoxr"
swresample_suggest="libm libsoxr stdatomic"
swscale_deps="avutil"
swscale_suggest="libm"
swscale_suggest="libm stdatomic"
avcodec_extralibs="pthreads_extralibs iconv_extralibs dxva2_extralibs"
avfilter_extralibs="pthreads_extralibs"
@ -6325,7 +6325,14 @@ check_headers asm/types.h
# it seems there are versions of clang in some distros that try to use the
# gcc headers, which explodes for stdatomic
# so we also check that atomics actually work here
check_builtin stdatomic stdatomic.h "atomic_int foo, bar = ATOMIC_VAR_INIT(-1); atomic_store(&foo, 0); foo += bar"
#
# some configurations also require linking to libatomic, so try
# both with -latomic and without
for LATOMIC in "-latomic" ""; do
check_builtin stdatomic stdatomic.h \
"atomic_int foo, bar = ATOMIC_VAR_INIT(-1); atomic_store(&foo, 0); foo += bar" \
$LATOMIC && eval stdatomic_extralibs="\$LATOMIC" && break
done
check_lib advapi32 "windows.h" RegCloseKey -ladvapi32
check_lib bcrypt "windows.h bcrypt.h" BCryptGenRandom -lbcrypt &&