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libcxxrt: allow build with gcc13 and --no-undefined-version

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GCC 13 supports _Float16 and __int128 on fewer architectures than clang
and thus libcxxrt compiled with gcc13 is sometimes missing related
symbols.  Hack around this by explicitly appending --undefined-version
to LDFLAGS in problematic cases.

Reviewed by:	theraven, dim
Differential Revision:	https://reviews.freebsd.org/D45233
This commit is contained in:
Brooks Davis 2024-05-17 21:22:22 +01:00
parent f7d45c5443
commit 1062db3070
1 changed files with 10 additions and 0 deletions
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10
lib/libcxxrt/Makefile
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@ -42,3 +42,13 @@ Version-64.map: Version.map
.endif
.include <bsd.lib.mk>
# gcc13 doesn't support _Float16 on riscv, powerpc64, and x86 or __int128
# on i386. Disable checks for missing symbols to allow this to link.
#
# XXX: This is a hack that hides an ABI divergence between clang and gcc.
.if ${COMPILER_TYPE} == "gcc" && \
(${MACHINE_ARCH} == "amd64" || ${MACHINE_ARCH} == "i386" || \
${MACHINE_ARCH:Mpowerpc64*} || ${MACHINE_ARCH} == "riscv64")
LDFLAGS+= -Wl,--undefined-version
.endif