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[cmake] gcc.cmake: Add some more clang libc++ hardening options.

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These options are now only applied if compiling with clang.

While it's possible to use libc++ with gcc, it requires a lot of manual
changes, and basicaly no one does it. (libstdc++ with clang is commonly
done on desktop Linux systems, though.)

Don't -D_LIBCPP_ENABLE_ASSERTIONS on clang-17 or later. It's deprecated,
and may result in a compile error. (...though on Android/Termux with
clang-20.1.3, it didn't...)
This commit is contained in:
David Korth 2025-04-28 18:22:21 -04:00
parent bd5b649bf3
commit 191cbab172
1 changed files with 18 additions and 4 deletions
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22
cmake/platform/gcc.cmake
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@ -303,10 +303,24 @@ SET(RP_CXX_FLAGS_RELEASE "-O2 -DNDEBUG ${CFLAGS_VECTORIZE}")
SET(RP_C_FLAGS_RELWITHDEBINFO "-O2 -ggdb -DNDEBUG ${CFLAGS_VECTORIZE}")
SET(RP_CXX_FLAGS_RELWITHDEBINFO "-O2 -ggdb -DNDEBUG ${CFLAGS_VECTORIZE}")
# Enable C++ assertions. (libstdc++ / libc++)
# Also enable C++ debug mode. (libstdc++ only)
# TODO: Only enable GLIBCXX for libstdc++, and LIBCPP for libc++.
SET(RP_CXX_FLAGS_DEBUG "${RP_CXX_FLAGS_DEBUG} -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC -D_LIBCPP_ENABLE_ASSERTIONS -D_LIBCPP_ENABLE_HARDENED_MODE")
# Enable C++ assertions and other hardening options. (libstdc++ / libc++)
# TODO: Check for the actual C++ runtime being used instead of
# assuming libc++ is only used with Clang.
SET(RP_CXX_FLAGS_DEBUG "${RP_CXX_FLAGS_DEBUG} -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC")
# libc++ (clang only)
IF(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
SET(RP_CXX_FLAGS_DEBUG "${RP_CXX_FLAGS_DEBUG} -D_LIBCPP_ASSERT=1 -D_LIBCPP_DEBUG=1 -D_LIBCPP_ENABLE_HARDENED_MODE=1")
IF(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 16.50)
# clang-17: Use _LIBCPP_HARDENING_MODE.
SET(RP_CXX_FLAGS_DEBUG "${RP_CXX_FLAGS_DEBUG} -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG")
ELSE(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 16.50)
# clang-16 or earlier: Use _LIBCPP_ENABLE_ASSERTIONS.
# NOTE: _LIBCPP_ENABLE_ASSERTIONS causes an error if using clang-17 or later.
SET(RP_CXX_FLAGS_DEBUG "${RP_CXX_FLAGS_DEBUG} -D_LIBCPP_ENABLE_ASSERTIONS=1")
ENDIF(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 16.50)
ENDIF(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
# Unset temporary variables.
UNSET(CFLAG_OPTIMIZE_DEBUG)