Bug -- what else? 8=}

[Christos Siopis <siopis at astro dot ufl dot edu>]

Greetings,

Consider the following program saved in file foo.c:

===================================
#include <math.h>

int main(void)
{
  int  n;

  n = (int) cos(acos(0.1));
  pow(0.123, 0.75);
  pow(0.123, 0.75);
  return 0;
}
===================================

Now I compile and run:

host% gcc -v -O2 foo.c -lm
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/specs
gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
 /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/cpp -lang-c -v -undef -D__GNUC__=2 -D__GNUC_MINOR__=91 -D__ELF__ -Dunix -Di386 -D__i386__ -Dlinux -D__ELF__ -D__unix__ -D__i386__ -D__i386__ -D__linux__ -D__unix -D__i386 -D__linux -Asystem(posix) -D__OPTIMIZE__ -Asystem(unix) -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ foo.c /tmp/cc9QFebC.i
GNU CPP version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release) (i386 Linux/ELF)
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /usr/i386-redhat-linux/include
 /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/include
 /usr/include
End of search list.
 /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/cc1 /tmp/cc9QFebC.i -quiet -dumpbase foo.c -O2 -version -o /tmp/ccOfD1E7.s
GNU C version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release) (i386-redhat-linux) compiled by GNU C version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release).
 as -V -Qy -o /tmp/ccT1vVyL.o /tmp/ccOfD1E7.s
GNU assembler version 2.9.1 (i386-redhat-linux), using BFD version 2.9.1.0.23
 /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/collect2 -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 /usr/lib/crt1.o /usr/lib/crti.o /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/crtbegin.o -L/usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66 -L/usr/i386-redhat-linux/lib /tmp/ccT1vVyL.o -lm -lgcc -lc -lgcc /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/crtend.o /usr/lib/crtn.o


host%  a.out
Segmentation fault


It does *not* segfault when:

1. I use optimization under -O2   --or--

2. I do not have to make the (int) cast (i.e., if n is a double)  --or--

3. I only have one pow() call.


This is using a Linux 2.2.7-1.25 kernel (RedHat 6.0).

Is this a bug or am I being up too late?

Thank you,
Christos Siopis
siopis@astro.ufl.edu

PS  Thanks for your efforts in making this great compiler!