gcc code dumpes core, other compilers do not

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2 total messages Started by Markus Lautenbacher Wed, 12 Aug 1992 11:57

#928

Author: Markus Lautenbacher
Date: Wed, 12 Aug 1992 11:57

48 lines
2723 bytes

Dear Sir,

whether this really is a bug report or not I am not a computer expert
enough to decide. So let me just bring the following to your attention.

I am writing right now a C program to get some theoretical predictions
for an experimentally measured quantity in particle physics.
Numerically this basically means to solve for the eigensystem of real,
non-symmetric matrices. Compiling my C-sources (basically K&R I style)
with various compilers, in particular GNU gcc, I have run into the
following problem:

--------------------------------------------------------
  Compiler  |                    Flags 
            |  default  |    -g    |    -O    |    -g-O
--------------------------------------------------------
Turbo-C 1.0 |     OK    |          |          |
    cc      |           |    OK    |    OK    |
  gcc-1.40  |           |    OK    |    OK    |
  gcc-2.1   |           |    OK    |    CD    |    CD
  gcc-2.2.2 |           |    CD    |    CD    |    CD

where OK means "compiles and links fine, runs and produces sensible
data" and CD means "compiles and links fine, but dumps core".
The workstation I am using is a Sun SPRCstation 1+ running SunOS 4.1.2.
The PC with the Turbo-C is a standard AT 286/7 clone under DOS 3.3.

I have found out that the problem is in a routine I have copied from
the program-listing disk of the wellknown "Numerical Recipes" book. So
it seems unlikely that I have made a programming error that now causes
the core dump. Strange enough the problem has come about with the
major release change 1.* -> 2.* and there first only in optimized code,
but now with the latest gcc in any kind of code.

Do you want me to send you my sources (in *.tar.Z form) to have a look
at the problem ? If you're interested let me know (please not that you
probably won't be able to reach me from 22/8/92 until 22/9/92 since I
am abroad for a research visit during that period).


Best regards,
             MARKUS

-----
MARKUS E. LAUTENBACHER,
Technical University Munich,    | phone:    +49/89/3209-2398
Physics Dept.-Theo. Physics T31,| Internet:
D-8046 Garching, FRG.           | lauten@feynman.t30.physik.tu-muenchen.de

gcc code dumpes core, other compilers do not

#941

Author: Richard Stallman
Date: Thu, 13 Aug 1992 13:07

12 lines
1053 bytes

This is probably a GCC bug.  But the GCC maintainers don't have time
to figure out how your program is supposed to work; we can only take
action if you verify positively that a particular line does not
execute as it should.

In particular, we need to know WHICH line doesn't execute as it
should.  There is no reason to assume that the problem is in the line
where the crash happens.  We need you to figure out which line
the fault is in.

If you determine this information, you can send a bug report
that enables us to fix the problem.

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