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| author | Cory Fields <cory-nospam-@coryfields.com> | 2017-02-22 13:33:22 -0500 |
|---|---|---|
| committer | Cory Fields <cory-nospam-@coryfields.com> | 2017-02-22 13:37:35 -0500 |
| commit | 9829c54de2725037ee0702306cbaa99fc9aa1826 (patch) | |
| tree | 34159e34bfbc44151210f13675f088a748802ea8 /build-aux/m4 | |
| parent | 5f0556d0326bf6f4d34f7e8b9ada7bbb09cb1df2 (diff) | |
build: force a c++ standard to be specified
Newer compilers may switch to newer standards by default. For example, gcc6
uses std=gnu++14 by default.
Diffstat (limited to 'build-aux/m4')
| -rw-r--r-- | build-aux/m4/ax_cxx_compile_stdcxx.m4 | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/build-aux/m4/ax_cxx_compile_stdcxx.m4 b/build-aux/m4/ax_cxx_compile_stdcxx.m4 index 2c18e49c56..f147cee3b1 100644 --- a/build-aux/m4/ax_cxx_compile_stdcxx.m4 +++ b/build-aux/m4/ax_cxx_compile_stdcxx.m4 @@ -57,8 +57,14 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl [$3], [mandatory], [ax_cxx_compile_cxx$1_required=true], [$3], [optional], [ax_cxx_compile_cxx$1_required=false], [m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])]) + m4_if([$4], [], [ax_cxx_compile_cxx$1_try_default=true], + [$4], [default], [ax_cxx_compile_cxx$1_try_default=true], + [$4], [nodefault], [ax_cxx_compile_cxx$1_try_default=false], + [m4_fatal([invalid fourth argument `$4' to AX_CXX_COMPILE_STDCXX])]) AC_LANG_PUSH([C++])dnl ac_success=no + + m4_if([$4], [nodefault], [], [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])], @@ -66,7 +72,7 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl [ax_cv_cxx_compile_cxx$1=no])]) if test x$ax_cv_cxx_compile_cxx$1 = xyes; then ac_success=yes - fi + fi]) m4_if([$2], [noext], [], [dnl if test x$ac_success = xno; then |