Add a new tc-get-cxx-stdlib() that attempts to get the C++ stdlib variant used by the current C++ compiler. Currently it supports libc++ and libstdc++ (GCC's stdlib).
Signed-off-by: Michał Górny <[email protected]> --- eclass/tests/toolchain-funcs.sh | 22 ++++++++++++++++++++ eclass/toolchain-funcs.eclass | 36 +++++++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+) diff --git a/eclass/tests/toolchain-funcs.sh b/eclass/tests/toolchain-funcs.sh index 56379b10cded..5a35a44ce018 100755 --- a/eclass/tests/toolchain-funcs.sh +++ b/eclass/tests/toolchain-funcs.sh @@ -198,4 +198,26 @@ for compiler in gcc clang not-really-a-compiler; do fi done +if type -P gcc &>/dev/null; then + tbegin "tc-get-cxx-stdlib (gcc)" + [[ $(CXX=g++ tc-get-cxx-stdlib) == libstdc++ ]] + tend $? +fi + +if type -P clang &>/dev/null; then + for stdlib in libc++ libstdc++; do + if clang++ -stdlib=${stdlib} -x c++ -E -P - &>/dev/null \ + <<<'#include <ciso646>' + then + tbegin "tc-get-cxx-stdlib (clang, ${stdlib})" + [[ $(CXX=clang++ CXXFLAGS="-stdlib=${stdlib}" tc-get-cxx-stdlib) == ${stdlib} ]] + tend $? + fi + done + + tbegin "tc-get-cxx-stdlib (clang, invalid)" + ! CXX=clang++ CXXFLAGS="-stdlib=invalid" tc-get-cxx-stdlib + tend $? +fi + texit diff --git a/eclass/toolchain-funcs.eclass b/eclass/toolchain-funcs.eclass index 48bf11606c4a..92494158201e 100644 --- a/eclass/toolchain-funcs.eclass +++ b/eclass/toolchain-funcs.eclass @@ -1173,4 +1173,40 @@ gen_usr_ldscript() { done } +# @FUNCTION: tc-get-cxx-stdlib +# @DESCRIPTION: +# Attempt to identify the C++ standard library used by the compiler. +# If the library is identified, the function returns 0 and prints one +# of the following: +# +# - ``libc++`` for ``sys-libs/libcxx`` +# - ``libstdc++`` for ``sys-devel/gcc``'s libstdc++ +# +# If the library is not recognized, the function returns 1. +tc-get-cxx-stdlib() { + local code='#include <ciso646> + +#if defined(_LIBCPP_VERSION) + HAVE_LIBCXX +#elif defined(__GLIBCXX__) + HAVE_LIBSTDCPP +#endif +' + local res=$( + $(tc-getCXX) ${CXXFLAGS} ${CPPFLAGS} -x c++ -E -P - \ + <<<"${code}" 2>/dev/null + ) + + case ${res} in + *HAVE_LIBCXX*) + echo libc++;; + *HAVE_LIBSTDCPP*) + echo libstdc++;; + *) + return 1;; + esac + + return 0 +} + fi -- 2.38.0
