On Fri, Jan 31, 2014 at 3:33 PM, Richard Biener <richard.guent...@gmail.com> wrote: > On Fri, Dec 13, 2013 at 10:47 PM, FX <fxcoud...@gmail.com> wrote: >>> The patch is okay, but if other architecture maintainers could add >>> similar checks for their ports (SPARC and PPC, I guess), it would be nice. >> >> Thanks, committed as rev. 205975 >> >> Adding other systems to the list of checks will be easy, once the >> maintainers confirm that they want to opt in into it. > > In our default build environment for package building GCC no longer builds > because of this: > > [ 152s] > /usr/lib64/gcc/x86_64-suse-linux/4.8/../../../../x86_64-suse-linux/bin/ > ld: skipping incompatible /usr/lib64/gcc/x86_64-suse-linux/4.8/libgcc.a when > sea > rching for -lgcc > [ 152s] > /usr/lib64/gcc/x86_64-suse-linux/4.8/../../../../x86_64-suse-linux/bin/ > ld: cannot find -lgcc > [ 152s] > /usr/lib64/gcc/x86_64-suse-linux/4.8/../../../../x86_64-suse-linux/bin/ld: > skipping incompatible /usr/lib64/gcc/x86_64-suse-linux/4.8/libgcc_s.so > when searching for -lgcc_s > [ 152s] > /usr/lib64/gcc/x86_64-suse-linux/4.8/../../../../x86_64-suse-linux/bin/ld: > cannot find -lgcc_s > [ 152s] collect2: error: ld returned 1 exit status > [ 152s] configure: error: I suspect your system does not have 32-bit > developement libraries (libc and headers). If you have them, rerun > configure with --enable-multilib. If you do not have them, and want to > build a 64-bit-only compiler, rerun configure with --disable-multilib. > > the issue is that while we do have 32bit glibc support installed but not all > required files for the host compiler to produce 32bit executables - which > isn't needed - the compiler we bootstrap will have all the support for this. > > In fact, a x86_64 multilib GCC can be just bootstrapped fine with a > non-multilib x86_64 compiler which you also disallow with the above check. > > I don't see how you can do this configure check in its current form early, > before you've built the stage1 compiler. > > So - please consider reverting this patch or at least provide a way to > override the check.
I've just seen that an explicit --enable-multilib is a way to do that. Still I think this is odd behavior - as you are matching x86_64-*linux you can as well check for /usr/include/gnu/stub{,-64}.h. I don't know of any distribution where you can have the header package installed without the corresponding libraries. Richard. > Thanks, > Richard. > > > >> FX