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# Use C99 as the language standard for C code.
CFLAGS="$CFLAGS -pthread -std=c99"
# Use the C++11 standard. Do not warn about C++11 incompatibilities.
CXXFLAGS="$CXXFLAGS -pthread -std=c++11 -Wno-c++11-compat"
# Clang requires suppression of unused arguments warnings.
if test "$c_compiler" = "clang"; then
CFLAGS="$CFLAGS -Qunused-arguments"
fi
# Suppress unused arguments warnings for C++ files as well.
if test "$cxx_compiler" = "clang++"; then
CXXFLAGS="$CXXFLAGS -Qunused-arguments"
# Default to libc++ as the standard library on Darwin, if it isn't already enforced through CXXFLAGS.
if test "$os_darwin" = "yes"; then
AS_CASE([$CXXFLAGS], [*-stdlib=*], [], [CXXFLAGS="$CXXFLAGS -stdlib=libc++"])
fi
# If Clang will be using libstdc++ as the standard library, version >= 4.8.1 should be in use.
AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
#if defined(__GLIBCXX__) && __GLIBCXX__ >= 20130531
#include <type_traits>
bool libstdcxxTest = std::is_trivially_destructible<bool>::value;
#endif
])], [], [AC_MSG_ERROR([libstdc++ >= 4.8.1 is required as the standard library used with the Clang compiler.])])
AC_LANG_POP([C++])
fi
if test "$host_cpu" = "sh4"; then
CXXFLAGS="$CXXFLAGS -mieee -w"
CFLAGS="$CFLAGS -mieee -w"
fi
# Add '-g' flag to gcc to build with debug symbols.
if test "$enable_debug_symbols" = "min"; then
CXXFLAGS="$CXXFLAGS -g1"
CFLAGS="$CFLAGS -g1"
elif test "$enable_debug_symbols" != "no"; then
CXXFLAGS="$CXXFLAGS -g"
CFLAGS="$CFLAGS -g"
fi
# Add the appropriate 'O' level for optimized builds.
if test "$enable_optimizations" = "yes"; then
CXXFLAGS="$CXXFLAGS -O2"
CFLAGS="$CFLAGS -O2"
if test "$c_compiler" = "gcc"; then
CFLAGS="$CFLAGS -D_FORTIFY_SOURCE=2"
fi
if test "$cxx_compiler" = "g++"; then
CXXFLAGS="$CXXFLAGS -D_FORTIFY_SOURCE=2"
fi
else
CXXFLAGS="$CXXFLAGS -O0"
CFLAGS="$CFLAGS -O0"
fi
# Some architectures need to add libatomic explicitly
AC_LANG_PUSH([C++])
AC_LINK_IFELSE([AC_LANG_SOURCE([[
#include <atomic>
int main() {
std::atomic<int64_t> i(0);
i++;
return 0;
}
]])], has_atomic=yes, has_atomic=no)
AC_LANG_POP([C++])
if test "$has_atomic" = "no"; then
LIBS="$LIBS -latomic"
fi
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