gcc 2.95.1 bug

Steven G. Johnson stevenj@hunsmac.mit.edu
Fri Oct 1 13:45:00 GMT 1999


I have encountered what looks like a bug in gcc 2.95.1, for which I
have attached a complete test case that illustrates the bug. I have
tried to make the test case as minimal as possible, and it should be
quite easy to follow.

gcc version: 2.95.1 (compiled from source)
system type: Linux 2.0.36 on Pentium II and Pentium III, RedHat 5.2 (glibc 2)
compiler options: see below

Short description:

I have two small files, bug.c and bug2.c, and a shared header bug.h.
When bug2.c is compiled with -O and bug.c is compiled with no flags,
the program demonstrates non-deterministic behaviour and starts
spitting out NaN values.

Longer description:

bug.c contains a subroutine bug() that does two things.  First, it
calls a routine called matrix3x3_invert in bug2.c to return the
inverse of an input matrix (the identity matrix), where both input and
return value are structs containing the elements of the matrix.  bug()
checks for NaNs in the returned matrix.  Second, it calls a function
foo() that returns a different struct with one element.

The main program just calls bug() repeatedly many times.  When bug2.c
is compiled with -O and bug.c is compiled with no flags, bug() detects
a NaN after it is called 4 times.

gcc 2.8.1 and 2.7.2.3 don't seem to demonstrate the error.

There are no arrays or pointers, and there don't seem to be any
unassigned variables or anything like that, so I don't see how bug()
could return different results on different calls without a compiler
bug.

I have attached a uuencoded .tar.gz archive containing:

	Makefile: makefile to compile and run the bug program
	bug.c, bug2.c, bug.h: the original source code
	bug-pre.c, bug2-pre.c: the preprocessed source code (with gcc -E)

Please let me know if you have any other questions, or if anyone can
replicate and/or figure out the bug.  I have replicated the bug on two
RedHat 5.2 systems (a P-II from VA Research with Linux pre-installed,
and a P-III from Dell with Linux freshly installed a couple of days
ago).

Cordially,
Steven G. Johnson

---------------------------cut here ------------------------------
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`
end


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