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Silence GCC warnings when using libc++ headers.

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GCC 12 raises warnings about literal operator suffixes not preceded by
'_' in libc++ headers such as <string_view> as it doesn't recognize
libc++ headers being an implementation of the standard.

GCC 12 also warns about clang-specific pragmas in <locale>.

Disabling these warnings globally for all C++ code is not ideal, but
is a better option than patching libc++ headers to ignore these
warnings.

Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D37530
This commit is contained in:
John Baldwin 2022-11-30 14:50:35 -08:00
parent d00c20882f
commit 442295c1fe
1 changed files with 8 additions and 0 deletions
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8
share/mk/bsd.sys.mk
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@ -217,6 +217,14 @@ CWARNFLAGS+= -Wno-error=overflow
.endif
.endif
# GCC 12.1.0
.if ${COMPILER_VERSION} >= 120100
# These warnings are raised by headers in libc++ so are disabled
# globally for all C++
CXXWARNFLAGS+= -Wno-literal-suffix \
-Wno-error=unknown-pragmas
.endif
# GCC produces false positives for functions that switch on an
# enum (GCC bug 87950)
CWARNFLAGS+= -Wno-return-type