[Bug c/51206] New: Building Cross-Compiler for Linux/x86_64 multilibs fails due to FLAGS_FOR_TARGET

[gcc at rkeene dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51206

             Bug #: 51206
           Summary: Building Cross-Compiler for Linux/x86_64 multilibs
                    fails due to FLAGS_FOR_TARGET
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: gcc@rkeene.org


In gcc 4.6.1's top-level "configure.ac" the following line:

FLAGS_FOR_TARGET=$FLAGS_FOR_TARGET' -B$(build_tooldir)/bin/
-B$(build_tooldir)/lib/ -isystem $(build_tooldir)/include -isystem
$(build_tooldir)/sys-include'

causes build failure for "libgcc" when creating a (non-Canadian) cross-compiler
for Linux/x86_64 using multilibs.

The failure is triggered when the 64-bit "libgcc" is built.  The -B.../lib 
argument is passed to "xgcc" causing it to look in the 32-bit "lib" directory
for the 64-bit "crti.o", "crtn.o", and "libc.so".

Specifically what fails is:

/bin/sh ../../../gcc-4.6.1/libgcc/../mkinstalldirs .
/home/rkeene/root/cross-compilers/build-cc/gcc-x86_64-slackware-linux/./gcc/xgcc
-B/home/rkeene/root/cross-compilers/build-cc/gcc-x86_64-slackware-linux/./gcc/
-B/home/rkeene/root/cross-compilers/x86_64-slackware-linux/x86_64-slackware-linux/bin/
-B/home/rkeene/root/cross-compilers/x86_64-slackware-linux/x86_64-slackware-linux/lib/
-isystem
/home/rkeene/root/cross-compilers/x86_64-slackware-linux/x86_64-slackware-linux/include
-isystem
/home/rkeene/root/cross-compilers/x86_64-slackware-linux/x86_64-slackware-linux/sys-include
--sysroot=/home/rkeene/root/cross-compilers/x86_64-slackware-linux/x86_64-slackware-linux
  -O2  -g -O2 -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE -DNATIVE_CROSS  -W -Wall
-Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT
-DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector  -shared
-nodefaultlibs -Wl,--soname=libgcc_s.so.1 -Wl,--version-script=libgcc.map -o
./libgcc_s.so.1.tmp -g -O2 -B./ _muldi3_s.o _negdi2_s.o _lshrdi3_s.o
_ashldi3_s.o _ashrdi3_s.o _cmpdi2_s.o _ucmpdi2_s.o _clear_cache_s.o
_enable_execute_stack_s.o _trampoline_s.o __main_s.o _absvsi2_s.o _absvdi2_s.o
_addvsi3_s.o _addvdi3_s.o _subvsi3_s.o _subvdi3_s.o _mulvsi3_s.o _mulvdi3_s.o
_negvsi2_s.o _negvdi2_s.o _ctors_s.o _ffssi2_s.o _ffsdi2_s.o _clz_s.o
_clzsi2_s.o _clzdi2_s.o _ctzsi2_s.o _ctzdi2_s.o _popcount_tab_s.o
_popcountsi2_s.o _popcountdi2_s.o _paritysi2_s.o _paritydi2_s.o _powisf2_s.o
_powidf2_s.o _powixf2_s.o _mulsc3_s.o _muldc3_s.o _mulxc3_s.o _divsc3_s.o
_divdc3_s.o _divxc3_s.o _bswapsi2_s.o _bswapdi2_s.o _fixunssfsi_s.o
_fixunsdfsi_s.o _fixunsxfsi_s.o _fixsfdi_s.o _fixdfdi_s.o _fixxfdi_s.o
_fixunssfdi_s.o _fixunsdfdi_s.o _fixunsxfdi_s.o _floatdisf_s.o _floatdidf_s.o
_floatdixf_s.o _floatundisf_s.o _floatundidf_s.o _floatundixf_s.o _divdi3_s.o
_moddi3_s.o _udivdi3_s.o _umoddi3_s.o _udiv_w_sdiv_s.o _udivmoddi4_s.o
addtf3_s.o divtf3_s.o multf3_s.o negtf2_s.o subtf3_s.o unordtf2_s.o fixtfsi_s.o
fixunstfsi_s.o floatsitf_s.o floatunsitf_s.o fixtfdi_s.o fixunstfdi_s.o
floatditf_s.o floatunditf_s.o fixtfti_s.o fixunstfti_s.o floattitf_s.o
floatuntitf_s.o extendsftf2_s.o extenddftf2_s.o extendxftf2_s.o trunctfsf2_s.o
trunctfdf2_s.o trunctfxf2_s.o getf2_s.o letf2_s.o eqtf2_s.o _divtc3_s.o
_multc3_s.o _powitf2_s.o unwind-dw2_s.o unwind-dw2-fde-glibc_s.o
unwind-sjlj_s.o gthr-gnat_s.o unwind-c_s.o emutls_s.o -lc && rm -f
./libgcc_s.so && if [ -f ./libgcc_s.so.1 ]; then mv -f ./libgcc_s.so.1
./libgcc_s.so.1.backup; else true; fi && mv ./libgcc_s.so.1.tmp ./libgcc_s.so.1
&& ln -s libgcc_s.so.1 ./libgcc_s.so
/home/rkeene/root/cross-compilers/x86_64-slackware-linux/x86_64-slackware-linux/bin/ld:
skipping incompatible
/home/rkeene/root/cross-compilers/x86_64-slackware-linux/x86_64-slackware-linux/lib/libc.so
when searching for -lc
/home/rkeene/root/cross-compilers/x86_64-slackware-linux/x86_64-slackware-linux/bin/ld:
i386 architecture of input file
`/home/rkeene/root/cross-compilers/x86_64-slackware-linux/x86_64-slackware-linux/lib/crti.o'
is incompatible with i386:x86-64 output
/home/rkeene/root/cross-compilers/x86_64-slackware-linux/x86_64-slackware-linux/bin/ld:
i386 architecture of input file
`/home/rkeene/root/cross-compilers/x86_64-slackware-linux/x86_64-slackware-linux/lib/crtn.o'
is incompatible with i386:x86-64 output
collect2: ld returned 1 exit status