Fwd: Segmentation fault in openmp simple routine from libgomp testsuite.

["Benjamin Réveillé" <benjamin dot reveille at gmail dot com>]

Hi FX

I hadn't tried dynamic linking... I have now and it also works fine...

Should I file a bug ?

Benjamin

On 2/28/06, François-Xavier Coudert <fxcoudert@gmail.com> wrote:
> > I might be missing out on something but I get a segmentation fault when
> > manualy executing omp_hello.f from libgomp testsuite
> > (libgomp/testsuite/libgomp.fortran/omp_hello.f)...
> >
> > Compiled using gfortran -static -fopenmp -g omp_hello.f -o omp_hello
>
> Hum... for trunk on i686-linux, I do see the following. Dynamic
> linking works fine:
>
> $ gfortran -fopenmp omp_hello.f && OMP_NUM_THREADS=2 ./a.out
>  Hello World from thread =            0
>  Number of threads =            2
>  Hello World from thread =            1
>
> Static linking fails:
>
> $ gfortran -fopenmp omp_hello.f -static
> /tmp/cc697VvU.o(.text+0x24): In function `MAIN__':
> omp_hello.f: undefined reference to `GOMP_parallel_start'
> /tmp/cc697VvU.o(.text+0x39):omp_hello.f: undefined reference to
> `GOMP_parallel_end'
> /tmp/cc697VvU.o(.text+0x49): In function `MAIN__.omp_fn.0':
> omp_hello.f: undefined reference to `omp_get_thread_num_'
> /tmp/cc697VvU.o(.text+0xe3):omp_hello.f: undefined reference to
> `omp_get_num_threads_'
> collect2: ld returned 1 exit status
>
> The reading of the libgomp.spec lead me to give it explicitly the
> needed libraries (although it shouldn't be necessary, I guess). But
> then, it segfaults:
>
> $ gfortran -fopenmp omp_hello.f -static -lgomp -lrt && OMP_NUM_THREADS=2 ./a.out
> zsh: segmentation fault  OMP_NUM_THREADS=2 ./a.out
>
> And the backtrace is:
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x08048466 in initialize_team () at ../../../gcc/libgomp/config/posix/sem.h:75
> 75      ../../../gcc/libgomp/config/posix/sem.h: No such file or directory.
>         in ../../../gcc/libgomp/config/posix/sem.h
> (gdb) where
> #0  0x08048466 in initialize_team ()
>     at ../../../gcc/libgomp/config/posix/sem.h:75
> #1  0x080aff5e in __do_global_ctors_aux ()
> #2  0x08048109 in _init ()
> #3  0x080613ed in __libc_csu_init ()
> #4  0x08061138 in __libc_start_main ()
> #5  0x08048141 in _start ()
>
>
> PS: Some details on the static linking failure:
>
> Driving: gfortran -fopenmp omp_hello.f -static -v -lgfortranbegin -lgfortran -lm
> Using built-in specs.
> Target: i386-linux
> Configured with: ../gcc/configure
> --prefix=/cosmic/coudert/tmp/gfortran-20060228/irun
> --enable-languages=c,fortran --host=i386-linux
> --with-gmp=/cosmic/coudert/tmp/gfortran-20060228/gfortran_libs
> Thread model: posix
> gcc version 4.2.0 20060228 (experimental)
>  /tmpdir/opt/gfortran/gfortran-20060228/bin/../libexec/gcc/i386-linux/4.2.0/f951
> omp_hello.f -ffixed-form -quiet -dumpbase omp_hello.f -mtune=i386
> -auxbase omp_hello -version -fopenmp -I
> /tmpdir/opt/gfortran/gfortran-20060228/bin/../lib/gcc/i386-linux/4.2.0/finclude
> -o /tmp/ccGKM8HT.s
> GNU F95 version 4.2.0 20060228 (experimental) (i386-linux)
>         compiled by GNU C version 4.2.0 20060228 (experimental).
> GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
>  as -V -Qy -o /tmp/cc08jqIE.o /tmp/ccGKM8HT.s
> GNU assembler version 2.15.94.0.2.2 (i386-redhat-linux) using BFD
> version 2.15.94.0.2.2 20041220
> Reading specs from
> /tmpdir/opt/gfortran/gfortran-20060228/bin/../lib/gcc/i386-linux/4.2.0/../../../libgomp.spec
>  /tmpdir/opt/gfortran/gfortran-20060228/bin/../libexec/gcc/i386-linux/4.2.0/collect2
> -m elf_i386 -static /usr/lib/crt1.o /usr/lib/crti.o
> /tmpdir/opt/gfortran/gfortran-20060228/bin/../lib/gcc/i386-linux/4.2.0/crtbeginT.o
> -lgomp -lrt -L/tmpdir/opt/gfortran/gfortran-20060228/bin/../lib/gcc/i386-linux/4.2.0
> -L/tmpdir/opt/gfortran/gfortran-20060228/bin/../lib/gcc
> -L/tmpdir/opt/gfortran/gfortran-20060228/bin/../lib/gcc/i386-linux/4.2.0/../../..
> /tmp/cc08jqIE.o -lgfortranbegin -lgfortran -lm --start-group -lgcc
> -lgcc_eh -lpthread -lc --end-group
> /tmpdir/opt/gfortran/gfortran-20060228/bin/../lib/gcc/i386-linux/4.2.0/crtend.o
> /usr/lib/crtn.o
> /tmp/cc08jqIE.o(.text+0x24): In function `MAIN__':
> omp_hello.f: undefined reference to `GOMP_parallel_start'
> /tmp/cc08jqIE.o(.text+0x39):omp_hello.f: undefined reference to
> `GOMP_parallel_end'
> /tmp/cc08jqIE.o(.text+0x49): In function `MAIN__.omp_fn.0':
> omp_hello.f: undefined reference to `omp_get_thread_num_'
> /tmp/cc08jqIE.o(.text+0xe3):omp_hello.f: undefined reference to
> `omp_get_num_threads_'
> collect2: ld returned 1 exit status
>
> --
> FX
>