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configure: Disable inline assembly with nonlocal labels with LTO on Clang on Windows

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The file libavcodec/x86/mlpdsp_init.c uses inline assembly with
nonlocal labels that are referenced outside of the assembly in C.
This fails to link with LTO when built with Clang when targeting
Windows.

The root cause has been reported upstream at
https://github.com/llvm/llvm-project/issues/76046.

Fixes: https://trac.ffmpeg.org/ticket/10548
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2023-12-20 14:39:50 +02:00
parent cb6b165b16
commit 102045028e
1 changed files with 10 additions and 0 deletions
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10
configure vendored
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@ -7399,6 +7399,16 @@ if [ -n "$lto" ]; then
check_cflags $lto
check_ldflags $lto $cpuflags
disable inline_asm_direct_symbol_refs
if test "$cc_type" = "clang"; then
# Clang's LTO fails on Windows, when there are references outside
# of inline assembly to nonlocal labels defined within inline assembly,
# see https://github.com/llvm/llvm-project/issues/76046.
case $target_os in
mingw32|win32)
disable inline_asm_nonlocal_labels
;;
esac
fi
fi
enabled ftrapv && check_cflags -ftrapv