X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=m4%2Fax_cxx_compile_stdcxx.m4;h=9413da624d2545123501b7788b7ac6d96fd322e8;hp=43087b2e6889ec6f8ebd2f8ba77f4a9a716f8ac2;hb=9197695fc88502b6a56c7270e824f73faa7749f9;hpb=67a2e95e20ac5354755993ba567f504718b74594 diff --git a/m4/ax_cxx_compile_stdcxx.m4 b/m4/ax_cxx_compile_stdcxx.m4 index 43087b2e..9413da62 100644 --- a/m4/ax_cxx_compile_stdcxx.m4 +++ b/m4/ax_cxx_compile_stdcxx.m4 @@ -16,7 +16,7 @@ # The second argument, if specified, indicates whether you insist on an # extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g. # -std=c++11). If neither is specified, you get whatever works, with -# preference for an extended mode. +# preference for no added switch, and then for an extended mode. # # The third argument, if specified 'mandatory' or if left unspecified, # indicates that baseline support for the specified C++ standard is @@ -35,13 +35,14 @@ # Copyright (c) 2015 Moritz Klammler # Copyright (c) 2016, 2018 Krzesimir Nowak # Copyright (c) 2019 Enji Cooper +# Copyright (c) 2020 Jason Merrill # # Copying and distribution of this file, with or without modification, are # permitted in any medium without royalty provided the copyright notice # and this notice are preserved. This file is offered as-is, without any # warranty. -#serial 11 +#serial 12 dnl This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro dnl (serial version number 13). @@ -62,6 +63,16 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl AC_LANG_PUSH([C++])dnl ac_success=no + m4_if([$2], [], [dnl + AC_CACHE_CHECK(whether $CXX supports C++$1 features by default, + ax_cv_cxx_compile_cxx$1, + [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])], + [ax_cv_cxx_compile_cxx$1=yes], + [ax_cv_cxx_compile_cxx$1=no])]) + if test x$ax_cv_cxx_compile_cxx$1 = xyes; then + ac_success=yes + fi]) + m4_if([$2], [noext], [], [dnl if test x$ac_success = xno; then for alternative in ${ax_cxx_compile_alternatives}; do