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m4/nc_cxx: don't enable libcxx on clang by default

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Some system libraries, like boost, may have linked against libstdc++ and
hence make breaking assumptions about std structure layouts.

eg, boost::filesystem::path and std::basic_string
This commit is contained in:
Danny Robson 2016-05-13 15:20:36 +10:00
parent 8dc4abb69c
commit 7cc4173dea
1 changed files with 5 additions and 7 deletions
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12
m4/nc_cxx.m4
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@ -1,6 +1,4 @@
AC_DEFUN([NC_CXX],[ AC_DEFUN([NC_CXX],[
AC_REQUIRE([AX_COMPILER_VENDOR])
AX_CHECK_COMPILE_FLAG( AX_CHECK_COMPILE_FLAG(
[-std=c++1z], [-std=c++1z],
[AX_APPEND_FLAG([-std=c++1z], [CXXFLAGS])], [AX_APPEND_FLAG([-std=c++1z], [CXXFLAGS])],
@ -16,11 +14,11 @@ AC_DEFUN([NC_CXX],[
AC_C_RESTRICT AC_C_RESTRICT
AC_C_INLINE AC_C_INLINE
AX_COMPILER_VENDOR AC_ARG_ENABLE([libcxx], [AS_HELP_STRING([--enable-libcxx], [use clang's cxx library])])
AS_IF(
[test "x$ax_cv_cxx_compiler_vendor" == "xclang"], AS_IF([test "x${enable_libcxx}" == "xyes"], [
[AX_APPEND_COMPILE_FLAGS([-stdlib=libc++])] AX_APPEND_COMPILE_FLAGS([-stdlib=libc++])
) ])
AX_APPEND_COMPILE_FLAGS([-fvisibility=hidden], [], [-Werror]) AX_APPEND_COMPILE_FLAGS([-fvisibility=hidden], [], [-Werror])
]) ])