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# FP_FIND_CXX_STD_LIB
# -------------------
#
# Identify which C++ standard library implementation the C++ toolchain links
# against.
AC_DEFUN([FP_FIND_CXX_STD_LIB],[
# Annoyingly, Darwin's <cstddef> includes <version> and APFS is
# case-insensitive. Consequently, it will end up #including the
# VERSION file generated by the configure script on the second
# and subsequent runs of the configure script.
# See #23116.
mkdir -p actest.tmp
cd actest.tmp
# If this is non-empty then assume that the user has specified these
# manually.
if test -z "$CXX_STD_LIB_LIBS"; then
cat >actest.cpp <<-EOF
#include <iostream>
#if defined(_LIBCPP_VERSION)
libc++
#elif defined(__GLIBCXX__)
libstdc++
#else
unknown
#endif
EOF
AC_MSG_CHECKING([C++ standard library flavour])
if ! "$CXX" -E actest.cpp -o actest.out; then
rm -f actest.cpp actest.out
AC_MSG_ERROR([Failed to compile test program])
fi
dnl Identify standard library type
if grep "libc++" actest.out >/dev/null; then
CXX_STD_LIB_FLAVOUR="c++"
AC_MSG_RESULT([libc++])
elif grep "libstdc++" actest.out >/dev/null; then
CXX_STD_LIB_FLAVOUR="stdc++"
AC_MSG_RESULT([libstdc++])
else
rm -f actest.cpp actest.out
AC_MSG_ERROR([Unknown C++ standard library implementation.])
fi
rm -f actest.cpp actest.out
dnl -----------------------------------------
dnl Figure out how to link...
dnl -----------------------------------------
cat >actest.cpp <<-EOF
#include <iostream>
int main(int argc, char** argv) {
std::cout << "hello world\n";
return 0;
}
EOF
if ! "$CXX" -c actest.cpp; then
AC_MSG_ERROR([Failed to compile test object])
fi
try_libs() {
dnl Try to link a plain object with CC manually
AC_MSG_CHECKING([for linkage against '${3}'])
if "$CC" -o actest actest.o ${1} 2>/dev/null; then
CXX_STD_LIB_LIBS="${3}"
p="`"$CXX" --print-file-name ${2}`"
d="`dirname "$p"`"
dnl On some platforms (e.g. Windows) the C++ standard library
dnl can be found in the system search path. In this case $CXX
dnl --print-file-name will simply print the filename without a
dnl directory part. Consequently, dirname will return `.`. However,
dnl we don't want to include such paths in the package database.
if test "$d" = "."; then d=""; fi
CXX_STD_LIB_LIB_DIRS="$d"
CXX_STD_LIB_DYN_LIB_DIRS="$d"
AC_MSG_RESULT([success])
true
else
AC_MSG_RESULT([failed])
false
fi
}
case $CXX_STD_LIB_FLAVOUR in
c++)
try_libs "-lc++ -lc++abi" "libc++.so" "c++ c++abi" || \
try_libs "-lc++ -lc++abi -lpthread" "libc++.so" "c++ c++abi pthread" || \
try_libs "-lc++ -lcxxrt" "libc++.so" "c++ cxxrt" ||
AC_MSG_ERROR([Failed to find C++ standard library]) ;;
stdc++)
try_libs "-lstdc++" "libstdc++.so" "stdc++" || \
try_libs "-lstdc++ -lsupc++" "libstdc++.so" "stdc++ supc++" || \
AC_MSG_ERROR([Failed to find C++ standard library]) ;;
esac
rm -f actest.cpp actest.o actest
fi
cd ..
rm -R actest.tmp
AC_SUBST([CXX_STD_LIB_LIBS])
AC_SUBST([CXX_STD_LIB_LIB_DIRS])
AC_SUBST([CXX_STD_LIB_DYN_LIB_DIRS])
])
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