Hello, This is a followup on Thomas' proposal at
http://gcc.gnu.org/ml/gcc-patches/2013-05/msg01617.html re the use of $target_alias vs $target derivatives in the GNAT Makefiles to select target specific pairs for runtime and tools. As part of this dicsussion, we: - agreed that moving back to a scheme based on canonical $target parts was better than relying on $target_alias, - mentioned that we had cases where we needed target_alias and that we were going to reconsider these, - agreed that Thomas' suggestion was a real improvement, and indicated that we were willing to experiment in-house before committing. Assuming we could indeed go back to a scheme where we rely essentially on canonical $target based values, the suggestion was to use standard variables computed by configure (target_cpu etc) instead of our ad-hoc computations (arch, osys etc). We experimented with this suggestion together with a change in the way we handle vxworksmils internally, which was the main motivation for the use of the non-canonical $target_alias in pair selections. It turned out that vxwmils has enough specificities of its own to better be handled as a canonical os name anyway. We're very happy with the change so I'm about to commit it, after bootstrap and regtest on x86_64-suse-linux, plus checks that the new version produces the same pairs as the original code for a panel of targets. Thanks a lot to Thomas and other participants for the input on this topic. With Kind Regards, Olivier 2013-10-11 Thomas Schwinge <tho...@codesourcery.com> Olivier Hainque <hain...@adacore.com> * gcc-interface/Makefile.in: Import target_cpu, target_vendor, target_os and their host_ counterparts. Remove host_canonical and target_cpu_default, unused. Remove local ad-hoc computations of "host", "targ", "arch", "osys" and "manu". Replace uses of these by uses of the now imported family, hence back to filters against canonical values. Remove filters on e500 for target_cpu, expected to be canonicalized into powerpc. Invert the logic filtering on 64bit sparc for VxWorks. Simplify the filtering logic for bareboard tools target pairs, now using straight elf/eabi filters on the target_os part only.
ada-target_alias.diff
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