Hi, Thanks for your continued patience and time. Are you saying it would have been better for me to install both 3.4.6 and 4.3.5 into ... say /opt/gcc and then use -V <3.4.6> or <4.3.5> to run one or the other? What does --enable-version-specific-runtime-libs and its buddy --with-gxx-include-dir=<dirname> do? Would disastrous space-time continuum consequences result if I tried to install multiple versions into the same prefix without using this runtime-libs option thingie??? Obviously I could just keep building compilers and trying various options. But for the sake of the planet's environment I would prefer to have some idea what might happen. If it runs to completion, the 4.3.5 build takes like 6 or 8+ hours (1000 MHz 750GX). kevin On Mon, Nov 15, 2010 at 1:02 PM, Ian Lance Taylor <iant@xxxxxxxxxx> wrote: > kevin diggs <diggskevin38@xxxxxxxxx> writes: > >> Can the compiler be configured to automatically include -rpath options >> when it knows that these internal libraries are being used? Otherwise >> it does not look like I can keep both 3.4.6 and 4.3.5 installed at the >> same time (though 3.4.6 can "probably" just use the internal parts >> from 4.3.5 ...). > > Please reply to the mailing list, not just to me. Thanks. > > There is no current configure option for that. The gcc installation > system is designed to permit multiple versions to be installed using the > same --prefix, in which case a single LD_LIBRARY_PATH or > /etc/ld.so.cache entry suffices for all versions. You are using > different --prefix options, which is fine, but means that you do need > multiple options. > > I personally would have no objection to such a configure option, but it > does not currently exist. > > Ian >
