[libstdc++-v3] lib64 folder is ignored when building x86_64-*-linux-gnu multilib cross toolchain

[Dmitry Perov]

Hi everyone,

I'm trying to build a gcc 4.9.3 cross-toolchain for x86_64-*-linux-gnu
target and get weird errors during configuration of libstdc++-v3.
Assuming that I have my sysroot under $(MY_SYSROOT) I have cross
binutils installed there and glibc-2.13 installed under
$(MY_SYSROOT)/lib and $(MY_SYSROOT)/lib64 for 32- and 64-bit versions
respectively. For some reason ld won't search for libc under
$(MY_SYSROOT)/lib64:

> configure:3898:  /home/dima/projects/linux-x86_64/build/toolchain/gcc/build/./gcc/xgcc -B/home/dima/projects/linux-x86_64/build/toolchain/gcc/build/./gcc/ -B$(MY_SYSROOT)/bin/ -B$(MY_SYSROOT)/lib/ -isystem $(MY_SYSROOT)/include -isystem $(MY_SYSROOT)/sys-include    -o conftest -g -O2 -pipe   conftest.c  >&5
> $(MY_SYSROOT)/bin/ld: skipping incompatible $(MY_SYSROOT)/lib/libc.so when searching for -lc
> $(MY_SYSROOT)/bin/ld: skipping incompatible $(MY_SYSROOT)/lib/libc.a when searching for -lc
> $(MY_SYSROOT)/bin/ld: cannot find -lc
> collect2: error: ld returned 1 exit status
> configure:3901: $? = 1


The part of config.log for libstdc++-v3 up to this place is attached.
What could be the issue and how can I fix this?

Best regards,
Dmitry Perov.

-- 
C уважением,
Дмитрий Перов.
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