🚀 go-pugleaf

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