[Bug middle-end/49640] New: Internal compiler in C99 code (using variable-length arrays) and OpenMP

["doriankrause at web dot de" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49640

           Summary: Internal compiler in C99 code (using variable-length
                    arrays) and OpenMP
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: doriankrause@web.de


Hello,

the attached code fails to compile with gcc 4.5.0 when enabling OpenMP:

[kraused@cub ~]$ gcc -c -std=gnu99 test.c
[kraused@cub ~]$ gcc -c -std=gnu99 -fopenmp test.c
test.c: In function 'convert_u8_f32.omp_fn.0':
test.c:31:9: internal compiler error: in expand_one_var, at cfgexpand.c:953
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

The gcc version is 4.5.0:

[kraused@cub ~]$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/share/apps/gcc/4.5.0/gcc_412/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ./configure --prefix=/share/apps/gcc/4.5.0/gcc_412
--with-mpfr=/share/apps/mpfr/2.4.2/gcc_412
--with-gmp=/share/apps/gmp/5.0.1/gcc_412
--with-mpc=/share/apps/mpc/0.8.2/gcc_412 --enable-languages=c,c++,fortran
Thread model: posix
gcc version 4.5.0 (GCC) 


Btw. the code also fails to compile with the 4.1.2 gcc on my RHEL box:

[kraused@icsprec03 ~]$ gcc -c -std=gnu99 -fopenmp convert.c 
convert.c: In function âconvert_u8_s32.omp_fn.0â:
convert.c:27: internal compiler error: in make_decl_rtl, at varasm.c:893
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://bugzilla.redhat.com/bugzilla> for instructions.
Preprocessed source stored into /tmp/ccsIbyBy.out file, please attach this to
your bugreport.
[kraused@icsprec03 ~]$ gcc -v
Using built-in specs.
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-libgcj-multifile
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk
--disable-dssi --disable-plugin
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic
--host=x86_64-redhat-linux
Thread model: posix
gcc version 4.1.2 20080704 (Red Hat 4.1.2-50)


Unfortunately I don't have a newer gcc available right now for testing.