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Date: Wed, 22 Feb 2006 10:28:00 -0000
Subject: [Bug c/26412]  New: Problem with OpenMP / C
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Message-ID: <bug-26412-12239@http.gcc.gnu.org/bugzilla/>
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From: "eloranta at jyu dot fi" <gcc-bugzilla@gcc.gnu.org>
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The following code causes gcc to crash when openmp is enabled:

bug2.c:

/*
 * This program triggers an openmp bug in gcc 4.2:
Using built-in specs.
Target: powerpc-apple-darwin8.4.0
Configured with: /opt/local/var/db/dports/build/_opt_local_var_db_dports_sour
ces_rsync.rsync.darwinports.org_dpupdate_dports_lang_gcc42/work/gcc-4.2-20060
204/configure --prefix=/opt/local --enable-languages=c,c++,java,objc,fortran 
--libdir=/opt/local/lib/gcc42 --includedir=/opt/local/include/gcc42 --infodir
=/opt/local/share/info --mandir=/opt/local/share/man --with-local-prefix=/opt
/local --with-system-zlib --disable-nls --program-suffix=-dp-4.2 --with-gxx-i
nclude-dir=/opt/local/include/gcc42/c++/ --with-gmp=/opt/local --with-mpfr=/o
pt/local --disable-multilib
Thread model: posix
gcc version 4.2.0 20060204 (experimental)
*
*
* To compile:
*
* gcc -fopenmp -c bug2.c
*
* The resulting error message is:
*
bug2.c: In function 'test':
bug2.c:34: internal compiler error: Bus error
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
*
* The program compiles without the -fopenmp flag.
*
* The system is MacOS X 10.4.5.
*
* Note: the program does nothing useful (it just for demonstrating the problem)
*
*/

extern double table_h[];
extern int dft_model;

void test() {

  int ri;
  double ph;

#pragma omp parallel for private(ri)
  for (ri = 0; ri < 100; ri++) {
    ph = table_h[dft_model];
  }
}

bug2.i:

# 1 "bug2.c"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "bug2.c"
# 26 "bug2.c"
extern double table_h[];
extern int dft_model;

void test() {

  int ri;
  double ph;

#pragma omp parallel for private(ri)
  for (ri = 0; ri < 100; ri++) {
    ph = table_h[dft_model];
  }
}


-- 
           Summary: Problem with OpenMP / C
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: eloranta at jyu dot fi


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26412