[Bug bootstrap/12679] New: parallel build failure with multilibs

["zlomek at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12679

           Summary: parallel build failure with multilibs
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Keywords: build
          Severity: normal
          Priority: P2
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: zlomek at gcc dot gnu dot org
                CC: aj at suse dot de,gcc-bugs at gcc dot gnu dot org
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu

When bootstrapping mainline with 2 processes (make -j2 bootstrap) 32-bit library
is wrongly configured and I get following error. When using 1 process or 4
processes the bug does not appear.

/usr/bin/ld: warning: i386 architecture of input file `.libs/allchblk.o' is
incompatible with i386:x86-64 output
/usr/bin/ld: warning: i386 architecture of input file `.libs/alloc.o' is
incompatible with i386:x86-64 output
/usr/bin/ld: warning: i386 architecture of input file `.libs/blacklst.o' is
incompatible with i386:x86-64 output
/usr/bin/ld: warning: i386 architecture of input file `.libs/checksums.o' is
incompatible with i386:x86-64 output
/usr/bin/ld: warning: i386 architecture of input file `.libs/dbg_mlc.o' is
incompatible with i386:x86-64 output
/usr/bin/ld: warning: i386 architecture of input file `.libs/dyn_load.o' is
incompatible with i386:x86-64 output
/usr/bin/ld: warning: i386 architecture of input file `.libs/finalize.o' is
incompatible with i386:x86-64 output
/usr/bin/ld: warning: i386 architecture of input file `.libs/gc_dlopen.o' is
incompatible with i386:x86-64 output
/usr/bin/ld: warning: i386 architecture of input file `.libs/gcj_mlc.o' is
incompatible with i386:x86-64 output
/usr/bin/ld: warning: i386 architecture of input file `.libs/headers.o' is
incompatible with i386:x86-64 output
/usr/bin/ld: warning: i386 architecture of input file `.libs/aix_irix_threads.o'
is incompatible with i386:x86-64 output
/usr/bin/ld: warning: i386 architecture of input file `.libs/malloc.o' is
incompatible with i386:x86-64 output
/usr/bin/ld: warning: i386 architecture of input file `.libs/mallocx.o' is
incompatible with i386:x86-64 output
/usr/bin/ld: warning: i386 architecture of input file `.libs/mark.o' is
incompatible with i386:x86-64 output

When I look into x86_64-unknown-linux-gnu/32/config.cache "-m32" is missing for
ac_cv_prog_CC but it is there for ac_cv_prog_CXXCPP:

ac_cv_prog_CC=${ac_cv_prog_CC='/abuild2/zlomekj/gcc-main/build/gcc/xgcc
-B/abuild2/zlomekj/gcc-main/build/gcc/
-B/usr/local/x86_64-unknown-linux-gnu/bin/
-B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem
/usr/local/x86_64-unknown-linux-gnu/include -isystem
/usr/local/x86_64-unknown-linux-gnu/sys-include'}
ac_cv_prog_CPP=${ac_cv_prog_CPP='/abuild2/zlomekj/gcc-main/build/gcc/xgcc
-B/abuild2/zlomekj/gcc-main/build/gcc/
-B/usr/local/x86_64-unknown-linux-gnu/bin/
-B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem
/usr/local/x86_64-unknown-linux-gnu/include -isystem
/usr/local/x86_64-unknown-linux-gnu/sys-include -E'}
ac_cv_prog_CXXCPP=${ac_cv_prog_CXXCPP='/abuild2/zlomekj/gcc-main/build/gcc/xgcc
-shared-libgcc -B/abuild2/zlomekj/gcc-main/build/gcc/ -nostdinc++
-L/abuild2/zlomekj/gcc-main/build/x86_64-unknown-linux-gnu/32/libstdc++-v3/src
-L/abuild2/zlomekj/gcc-main/build/x86_64-unknown-linux-gnu/32/libstdc++-v3/src/.libs
-B/usr/local/x86_64-unknown-linux-gnu/bin/
-B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem
/usr/local/x86_64-unknown-linux-gnu/include -isystem
/usr/local/x86_64-unknown-linux-gnu/sys-include  -m32 -E'}