[Bug c/51129] New: 4.7 trunk libgcc cannot compute suffix of object files - cannot find find libcloog, though in path

[ohsumit at molbio dot mgh.harvard.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51129

             Bug #: 51129
           Summary: 4.7 trunk libgcc cannot compute suffix of object files
                    - cannot find find libcloog, though in path
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: blocker
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ohsumit@molbio.mgh.harvard.edu


I am trying to compile the trunk version of gcc (checked out around 2:30 PM
Eastern Nov. 14, 2011) under SuSE linux using gcc 4.1.2 20070115 (default
installed).  I have cloog-ppl-0.15.11, gmp-5.0.2, mpc-0.9, and mpfr-3.1.0 all
installed in /usr/local/{include,lib} and have m4-1.4.16 in /usr/bin.  All of
the libraries passed their checks before I installed them.  I have

declare -x LDFLAGS="-L/usr/local/lib -L/usr/local/lib64 -L/usr/lib -L/usr/lib64
-L/lib -L/lib64
-R/usr/local/lib:/usr/local/lib64:/usr/lib:/usr/lib64:/lib:/lib64"
declare -x
LD_LIBRARY_PATH="/usr/lib:/usr/lib64:/lib:/lib64:/usr/local/lib:/usr/local/lib64

Now in the below, directories /tools and /store1/tools are identical.  I then
did

sudo /tools/gcc-4.7.0_src/configure --enable-langugages=c,c++,fortran
--prefix=/tools/gcc-4.7.0 --with-gmp-include=/usr/local/include
--with-gmp-lib=/usr/local/lib --with-mpc-include=/usr/local/include
--with-mpc-lib=/usr/local/lib --with-mpfr-include=/usr/local/include
--with-mpfr-lib=/usr/local/lib --with-ppl-include=/usr/local/include
--with-ppl-lib=/usr/local/lib --with-cloog-include=/usr/local/include
--with-cloog-lib=/usr/local/lib

in directory /tools/gcc-4.7.0_build followed by "sudo make -j6".  (I also tried
it without the -j6.  Same problem.)  It compiles xgcc in subdirectory gcc
successfully.  However, then the build crashes on

mkdir -p -- x86_64-unknown-linux-gnu/libgcc
Checking multilib configuration for libgcc...
Configuring stage 1 in x86_64-unknown-linux-gnu/libgcc
configure: creating cache ./config.cache
... <some lines edited out> ...
checking whether ln -s works... yes
checking for x86_64-unknown-linux-gnu-gcc...
/store1/tools/gcc-4.7.0_build/./gcc/xgcc -B/store1/tools/gcc-4.7.0_build/./gcc/
-B/tools/gcc-4.7.0/x86_64-unknown-linux-gnu/bin/
-B/tools/gcc-4.7.0/x86_64-unknown-linux-gnu/lib/ -isystem
/tools/gcc-4.7.0/x86_64-unknown-linux-gnu/include -isystem
/tools/gcc-4.7.0/x86_64-unknown-linux-gnu/sys-include   
checking for suffix of object files... configure: error: in
`/store1/tools/gcc-4.7.0_build/x86_64-unknown-linux-gnu/libgcc':
configure: error: cannot compute suffix of object files: cannot compile

where the config.log in libgcc says

configure:3650: /store1/tools/gcc-4.7.0_build/./gcc/xgcc
-B/store1/tools/gcc-4.7.0_build/./gcc/
-B/tools/gcc-4.7.0/x86_64-unknown-linux-gnu/bin/
-B/tools/gcc-4.7.0/x86_64-unknown-linux-gnu/lib/ -isystem
/tools/gcc-4.7.0/x86_64-unknown-linux-gnu/include -isystem
/tools/gcc-4.7.0/x86_64-unknown-linux-gnu/sys-include    -c -g -O2  conftest.c
>&5
/store1/tools/gcc-4.7.0_build/./gcc/cc1: error while loading shared libraries:
libcloog.so.0: cannot open shared object file: No such file or directory
configure:3654: $? = 1
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "GNU C Runtime Library"
| #define PACKAGE_TARNAME "libgcc"
| #define PACKAGE_VERSION "1.0"
| #define PACKAGE_STRING "GNU C Runtime Library 1.0"
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL "http://www.gnu.org/software/libgcc/"
| /* end confdefs.h.  */
|
| int
| main ()
| {
|
|   ;
|   return 0;
| }

What is puzzling is that 

> ls -l /usr/local/lib/libcloog.so.*
lrwxrwxrwx 1 root root     17 2011-11-14 13:58 /usr/local/lib/libcloog.so.0 ->
libcloog.so.0.0.0
-rwxr-xr-x 1 root root 428100 2011-11-14 13:57 /usr/local/lib/libcloog.so.0.0.0

the library is there and the path is in both LD_LIBRARY_PATH as well as
LDFLAGS.  Furthermore, I specified the path to cloog in the configure options. 
(I even tried doing a soft-link to /usr/lib, but with no success.)  Any
thoughts on why this is occurring?  

I would be grateful for any information regarding how to resolve this.