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| author | Joshua Judson Rosen <jrosen@harvestai.com> | 2015-12-02 16:46:05 -0500 |
|---|---|---|
| committer | Peter Simons <simons@cryp.to> | 2016-02-29 11:41:21 +0100 |
| commit | 9e5ef8a7fa6f32dce37a9a340cef793254d2396b (patch) | |
| tree | f5ee7f83c763343a4a85c7057575967dcf1659bc /m4/ax_cxx_compile_stdcxx_0x.m4 | |
| parent | 401d6b8cefcc5bf3c1f6c35d76c589bb6b7387b0 (diff) | |
| download | autoconf-archive-9e5ef8a7fa6f32dce37a9a340cef793254d2396b.tar.gz | |
AX_CXX_COMPILE_STDCXX: don't break "make CXXFLAGS=..."
Make C++ std-selection macros modify $(CXX), not $(CXXFLAGS).
Using $(CXXFLAGS) prevents users from being able to
rebuild with different CXXFLAGS (e.g.: to try out
different optimisations or to change debug levels)
unless they re-run ./configure with their CFLAGS.
This is more like what the mainline Autoconf macros do
(e.g.: AC_PROG_CC_C99, AC_PROG_CC_STD, etc. modify $(CC),
not $(CCFLAGS)), presmuably for much the same reasons:
if you need to specify a standard to the compiler,
it doesn't really make sense to separate that from
$(CC)/$(CXX) since $(CC)/$(CXX) aren't usable without it.
Diffstat (limited to 'm4/ax_cxx_compile_stdcxx_0x.m4')
| -rw-r--r-- | m4/ax_cxx_compile_stdcxx_0x.m4 | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/m4/ax_cxx_compile_stdcxx_0x.m4 b/m4/ax_cxx_compile_stdcxx_0x.m4 index a49f430..52c3984 100644 --- a/m4/ax_cxx_compile_stdcxx_0x.m4 +++ b/m4/ax_cxx_compile_stdcxx_0x.m4 @@ -23,7 +23,7 @@ # and this notice are preserved. This file is offered as-is, without any # warranty. -#serial 9 +#serial 10 AU_ALIAS([AC_CXX_COMPILE_STDCXX_0X], [AX_CXX_COMPILE_STDCXX_0X]) AC_DEFUN([AX_CXX_COMPILE_STDCXX_0X], [ @@ -55,8 +55,8 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX_0X], [ ax_cv_cxx_compile_cxx0x_cxx, [AC_LANG_SAVE AC_LANG_CPLUSPLUS - ac_save_CXXFLAGS="$CXXFLAGS" - CXXFLAGS="$CXXFLAGS -std=c++0x" + ac_save_CXX="$CXX" + CXX="$CXX -std=c++0x" AC_TRY_COMPILE([ template <typename T> struct check @@ -73,7 +73,7 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX_0X], [ check_type c; check_type&& cr = static_cast<check_type&&>(c);],, ax_cv_cxx_compile_cxx0x_cxx=yes, ax_cv_cxx_compile_cxx0x_cxx=no) - CXXFLAGS="$ac_save_CXXFLAGS" + CXX="$ac_save_CXX" AC_LANG_RESTORE ]) @@ -81,8 +81,8 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX_0X], [ ax_cv_cxx_compile_cxx0x_gxx, [AC_LANG_SAVE AC_LANG_CPLUSPLUS - ac_save_CXXFLAGS="$CXXFLAGS" - CXXFLAGS="$CXXFLAGS -std=gnu++0x" + ac_save_CXX="$CXX" + CXX="$CXX -std=gnu++0x" AC_TRY_COMPILE([ template <typename T> struct check @@ -99,7 +99,7 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX_0X], [ check_type c; check_type&& cr = static_cast<check_type&&>(c);],, ax_cv_cxx_compile_cxx0x_gxx=yes, ax_cv_cxx_compile_cxx0x_gxx=no) - CXXFLAGS="$ac_save_CXXFLAGS" + CXX="$ac_save_CXX" AC_LANG_RESTORE ]) |