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

[FX Coudert <fxcoudert at gmail dot com>]

> Should I file a bug ?

I think it might be better to wait for the opinion of the gomp  
maintainers, as I'm fairly new to that stuff and could have missed  
something important.

Jakuk, Diego? Is this a bug or a feature? :)

> > 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