nx-libs/m4/ax_cxx_compile_stdcxx.m4, branch 3.6.x

nx-libs/m4/ax_cxx_compile_stdcxx.m4, branch 3.6.x NXv3 (redistributed) https://openid.arctica-project.org/nx-libs/atom?h=3.6.x 2019-04-04T09:19:01+00:00 m4/: update external macros from autoconf-archive. 2019-04-04T09:19:01+00:00 Mihai Moldovan ionic@ionic.de 2019-04-01T07:16:43+00:00 urn:sha1:2efaa423bdfb8067897028854a5c56086d3843fc nx{comp{,shad},proxy}: add configure flag --enable-cxx11 to enable and setup optional C++11 support. 2017-10-27T06:45:42+00:00 Mihai Moldovan ionic@ionic.de 2017-09-29T15:19:06+00:00 urn:sha1:1f717c6fdfa478f1c422bff51bc8574360dbe127 Use AX_CXX_COMPILE_STDCXX(_11) from autotools archive. Note: should only be used in tandem. Make sure that each component either uses the C++11 ABI or none uses it. Mixing and matching libraries and binaries with different C++ ABIs might lead to weird errors.