http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55293
--- Comment #16 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2012-11-14 08:49:46 UTC --- > FWIW, I bootstrapped a pure 64-bit gcc-4.7.2 on Solaris 10/SPARC64 yesterday, > with C, Ada, and C++, using a normal 32-bit-but-64-bit-capable gcc-4.7.2 as > host compiler. About the only issue was that I had to coerce the host > compiler > to generate 64-bit code by default; for that I put > > #!/bin/sh > exec gcc -m64 "$@" > > in a "gcc64" shell script and passed the path to it in CC when configuring > gcc. That's not even necessary, just do CC="gcc -m64" ./configure [options]. > Overriding CFLAGS might have worked too, but I didn't try that. Nope, fiddling with CFLAGS, BOOT_CFLAGS and the like is strongly discouraged.
