* m4/ax_cxx_compile_stdcxx.m4: Replace with current version from the
autoconf archive.
--
This fixes the problem that the switch -std=c++11 was omitted if the
compiler supported C++11 features by default. This made gcc happily
compile C++14 code. Now C++11 is enforced by gcc.
GnuPG-bug-id: 6141
* m4/ax_cxx_compile_stdxx.m4 (AX_CXX_COMPILE_STDCXX): Set CXXCPP if
neccessary.
--
This fixes the build with scan-build where CXXCPP is already set but
does not include stdc++11. While this deviates from the
autotools-archive version of the script it does not make sense
to me first to check if stdc++11 needs to be set and then not
set it.
* configure.ac: Call ax_cxx_compile_stdcxx
* m4/ax_cxx_compile_stdcxx.m4
--
Depending on c++11 is intended to make the port away from
Boost easier.
The m4 macro was taken from the website mentioned in the License
header of the file.
