| # Check if $CXX does or can be made to support C++11 by adding switches. |
| # If $CXX explicitly selects a language standard, then |
| # refrain from overriding this choice. |
| AC_DEFUN([AX_CXX_COMPILE_STDCXX_11_NO_OVERRIDE], [dnl |
| AC_PROG_GREP |
| echo $CXX | $GREP -e "-std=" > /dev/null 2> /dev/null |
| if test $? -eq 0; then |
| _AX_CXX_COMPILE_STDCXX_11_DEFAULT |
| else |
| AX_CXX_COMPILE_STDCXX_11([noext], [optional]) |
| fi |
| ]) |
| |
| # Check if $CXX supports C++11 by default (without adding switches). |
| # This is a trimmed down version of AX_CXX_COMPILE_STDCXX_11 |
| # that reuses its _AX_CXX_COMPILE_STDCXX_testbody_11. |
| AC_DEFUN([_AX_CXX_COMPILE_STDCXX_11_DEFAULT], [dnl |
| AC_LANG_PUSH([C++])dnl |
| ac_success=no |
| AC_CACHE_CHECK(whether $CXX supports C++11 features by default, |
| ax_cv_cxx_compile_cxx11, |
| [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_11])], |
| [ax_cv_cxx_compile_cxx11=yes], |
| [ax_cv_cxx_compile_cxx11=no])]) |
| if test x$ax_cv_cxx_compile_cxx11 = xyes; then |
| ac_success=yes |
| fi |
| AC_LANG_POP([C++]) |
| if test x$ac_success = xno; then |
| HAVE_CXX11=0 |
| else |
| HAVE_CXX11=1 |
| AC_DEFINE(HAVE_CXX11,1, |
| [define if the compiler supports basic C++11 syntax]) |
| fi |
| AC_SUBST(HAVE_CXX11) |
| ]) |
