[Bug driver/36485] New: gcc driver incorrectly assumes existence of $(prefix)/usr/lib

["pluto at agmk dot net" <gcc-bugzilla at gcc dot gnu dot org>]

i've configured gcc in this way:

$ ./xgcc -B. -v

Reading specs from ./specs
Target: x86_64-gnu-linux
Configured with: ../configure --target=x86_64-gnu-linux --with-arch=k8
--prefix=/local/devel/toolchain43/x86_64-gnu-linux
--with-sysroot=/local/devel/toolchain43/x86_64-gnu-linux
--libdir=/local/devel/toolchain43/x86_64-gnu-linux/lib64
--libexecdir=/local/devel/toolchain43/x86_64-gnu-linux/lib64
--with-slibdir=/local/devel/toolchain43/x86_64-gnu-linux/lib64
--with-gmp-include=/home/users/builder/toolchain/trunk/linux/gcc-math-runtime/include
--with-gmp-lib=/home/users/builder/toolchain/trunk/linux/gcc-math-runtime/lib64
--with-mpfr-include=/home/users/builder/toolchain/trunk/linux/gcc-math-runtime/include
--with-mpfr-lib=/home/users/builder/toolchain/trunk/linux/gcc-math-runtime/lib64
--disable-multilib --disable-nls --disable-libgomp --disable-libmudflap
--disable-libssp --disable-libstdcxx-pch --enable-c99 --enable-long-long
--enable-linux-futex --enable-threads=posix --enable-__cxa_atexit
--enable-languages=c,c++ --enable-symvers=gnu --with-long-double-128
--disable-cld --disable-bootstrap
Thread model: posix
gcc version 4.3.1 (GCC)

afaics, the collect2 contains LIBRARY_PATH=./:
/local/devel/toolchain43/x86_64-gnu-linux/usr/lib/../lib64/:
/local/devel/toolchain43/x86_64-gnu-linux/usr/lib/

which uses $(prefix)/usr/lib directory (which may not exist in sysroot!)
to access stuff in lib64. in my case, this directory doesn't exist,
linker fails and libstdc++ configure reports errors.

imho using $(readlink -m) to canonicalize builtin search paths
is a good solution.


-- 
           Summary: gcc driver incorrectly assumes existence of
                    $(prefix)/usr/lib
           Product: gcc
           Version: 4.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pluto at agmk dot net
GCC target triplet: x86_64-gnu-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36485