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51cc8aa9f6
The GNU libstdc++ that ships witch gcc 5 can be used with the same ABI as older versions, or with a new ABI which is conformant to the C++11 standard. LyX did not build if the latter was used: https://kojipkgs.fedoraproject.org//work/tasks/1267/9651267/build.log This is now fixed by detecting the ABI version and disabling the wrong forward declarations. At the same time, STD_STRING_USES_COW is switched off for the C++11 ABI version, because the std::basic_string implementation is now C++11 conformant. Since the GNU libstdc++ can also used by other compilers such as clang, we must not test for the compiler version.