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[Bug bootstrap/67728] Build fails when cross-compiling with in-tree GMP and ISL
- From: "joseph at codesourcery dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 28 Sep 2015 17:01:51 +0000
- Subject: [Bug bootstrap/67728] Build fails when cross-compiling with in-tree GMP and ISL
- Auto-submitted: auto-generated
- References: <bug-67728-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67728
--- Comment #5 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
GMP does, or did, select an ABI at configuration time that may not be the
same as that used by default by the compiler used to build it. For
example, if building on an x86_64 processor it might select a 64-bit ABI
even if you have configured GCC for a 32-bit host. If your goal is to
make multiple-precision computations as fast as possible, choosing the ABI
for that purpose makes sense - but for GCC's uses the requirement is to
choose the same ABI as for the selected host, even if that's slower than
some other ABI available on the processor.