On 18 April 2012 00:42, Oleg Smolsky wrote: > Hey all, I have a question about running multiple compilers concurrently on > a single OS. Here is what I do: > - configure gcc 4.7.0 with --prefix=/work/tools/gcc47 > - build and install > - reference /work/tools/gcc47/lib64 in /etc/ld.so.conf.d/gcc47-x86_64.conf > > This, however, forces the new version of libstdc++.so onto binaries that are > built with the system compiler. Normally that works, but we have just hit an > issue where std::stringstream::tellg() returns a different value after > extracting an "int". (the system compiler is 4.4.5 20110214 (Red Hat > 4.4.5-6)) That's a bug in the old version's stringstream that was fixed. If you recompiled the old binaries with -D_GLIBCXX_EXTERN_TEMPLATE=0 then the instantiation in libstdc++.so wouldn't be used, but that's not a very practical solution. > So, is there a way to build gcc and force a bump in the .so version? This > way I could keep environments completely distinct when using shared libs > (the issue goes away when statically linking the runtime) Using --enable-symvers=gnu-versioned-namespace will bump the soname (as well as moving all entities in namespace std to the inline namespace std::__v7)
