[FFmpeg-cvslog] configure: Disable linker warnings for common symbols

Andreas Rheinhardt git at videolan.org
Mon Feb 26 23:53:13 EET 2024

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Fri Feb 23 18:54:10 2024 +0100| [25e0e087c4314730d42ac16061962904b8fb3ae6] | committer: Andreas Rheinhardt

configure: Disable linker warnings for common symbols

Common symbols are not part of ISO-C and therefore not used
by FFmpeg at all. Yet linker warnings to ensure it stays
that way are nevertheless wrong, because the existence of
common symbols does not imply that there is a bug in our code.

More precisely, Clang's ASAN implementation uses a common symbol
___asan_globals_registered when used on Elf targets with
the -fsanitize-address-globals-dead-stripping option;
said option is the default since Clang 17 [1].
This leads to 1883 warnings about ___asan_globals_registered
when linking here.
(Even without that option there were warnings like
_ZN14__interception10real_vforkE being overridden.)

Said warning is also unnecessary: The proper way to ensure
that our code is free of common symbols is to let the compiler
enforce this. But this is already the default since GCC 10
and Clang 11, so there is no risk of introducing our own
common symbols.

[1]: https://reviews.llvm.org/D152604

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=25e0e087c4314730d42ac16061962904b8fb3ae6

 configure | 1 -
 1 file changed, 1 deletion(-)

diff --git a/configure b/configure
index 2d0e6a444a..bb5e630bad 100755
--- a/configure
+++ b/configure
@@ -7337,7 +7337,6 @@ void (^block)(void);
 # add some linker flags
-check_ldflags -Wl,--warn-common
 check_ldflags -Wl,-rpath-link=:libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil
 enabled rpath && add_ldexeflags -Wl,-rpath,$libdir && add_ldsoflags -Wl,-rpath,$libdir
 test_ldflags -Wl,-Bsymbolic && append SHFLAGS -Wl,-Bsymbolic

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