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libs/libcxx: Silence warnings when building libcxx.

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Silence two warnings when building libcxx with GCC 12.2.0 and std=c++2b:

libcxx/src/charconv.cpp_CXXFLAGS += -Wno-attributes
 - Results from libcxx fallback to use __always_inline__ when exclude_from_explicit_instantiation isn't available.

libcxx/src/locale.cpp_CXXFLAGS += -Wno-attributes
 - Results from the expansion of _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS. Should be fine to ignore.
This commit is contained in:
Stuart Ianna
2023-10-26 12:56:55 +11:00
committed by Alin Jerpelea
parent 5fa1819492
commit ad9f6b79e0
1 changed files with 21 additions and 0 deletions
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libs/libxx/libcxx.defs
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@@ -115,6 +115,27 @@ endif
# ~~~~~~~~~~^~~~~~~~~~~~
libcxx/src/condition_variable.cpp_CXXFLAGS += -Wno-sign-compare
# When building with GCC 12.2.0
# libcxx has a fallback to use __always_inline__ when the (clang) exclude_from_explicit_instantiation isn't available.
# This causes: `always_inline` function might not be inlinable [-Wattributes] warnings in some modules.
# For example:
# libcxx/src/include/to_chars_floating_point.h:988:17: warning: ‘always_inline’ function might not be inlinable [-Wattributes]
# Should be OK to ignore these
ifeq ($(GCCVER),12)
libcxx/src/charconv.cpp_CXXFLAGS += -Wno-attributes
endif
# Another warning on gcc 12.2.0
# libcxx/src/locale.cpp:6604:85: warning: type attributes ignored after type is already defined [-Wattributes]
# 6604 | template class _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS codecvt_byname<char16_t, char, mbstate_t>;
# | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# libcxx/src/locale.cpp:6605:85: warning: type attributes ignored after type is already defined [-Wattributes]
# 6605 | template class _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS codecvt_byname<char32_t, char, mbstate_t>;
ifeq ($(GCCVER),12)
libcxx/src/locale.cpp_CXXFLAGS += -Wno-attributes
endif
CPPSRCS += $(wildcard libcxx/src/*.cpp)
CPPSRCS += $(wildcard libcxx/src/experimental/*.cpp)
CPPSRCS += $(wildcard libcxx/src/filesystem/*.cpp)