2011/8/26 Ian Lance Taylor <iant@xxxxxxxxxx>: >> I think that one idea of installing gcc under /opt/csw/gcc4 was to >> support an installation of multiple versions at the same time. For >> example, gcc-3.x would go under /opt/csw/gcc3, gcc-4.x would go under >> /opt/csw/gcc4, etc. > > To be clear, the header files and libraries are gcc version specific. > You can't use the gcc-4.x libstdc++ header files with gcc-3.x. The headers are installed in a directory which includes the version, so that should work well. I have a question about libraries, though. There are some libraries which haven't changed their SONAMEs since gcc-3.x. For example a compiled gcc-3.4.6 will produce libstdc++.so.6, and so wil gcc-4.6.1. The theory is that if the SONAME of a shared library doesn't change, applications should be able to link against that library at runtime and run fine. If that's true, I should be able to compile and link a binary against libstdc++.so.6 using gcc.3.4.6, and then replace libstdc++.so.6 with the one built by gcc-4.6.1. Is this in fact possible? Maciej
