[parisc-linux] perl/gcc bug if someone wants to look :)

[parisc-linux] perl/gcc bug if someone wants to look :)

[Randolph Chung]

perl-5.8 fails to build on hppa because of a test failure. The problem
can be seen very easily:

tausq@gsyprf11:~/build/perl-5.8.0$ cat t/t.pl
print log "A";
tausq@gsyprf11:~/build/perl-5.8.0$ ./perl t/t.pl
Can't take log of 2.75773e-308 at t/t.pl line 1.

that should have said:
tausq@gsyprf11:~/build/perl-5.8.0$ /usr/bin/perl t/t.pl
Can't take log of 0 at t/t.pl line 1.

interestingly, a debug build of perl (using -g and no -O flags) doesn't
have the same problem, so this looks like some kind of compiler
optimization bug. I've tried this with both 3.2.3 and 3.3... same
problems.

would anyone like to try to look at this some more and see if they can
isolate the C code/a small test case that is causing the problem?

thanks
randolph
-- 
Randolph Chung
Debian GNU/Linux Developer, hppa/ia64 ports
http://www.tausq.org/

[parisc-linux] glibc/gcc bug -> perl/gcc bug?

[Carlos O'Donell]

> perl-5.8 fails to build on hppa because of a test failure. The problem
> can be seen very easily:
> 
> tausq@gsyprf11:~/build/perl-5.8.0$ cat t/t.pl
> print log "A";
> tausq@gsyprf11:~/build/perl-5.8.0$ ./perl t/t.pl
> Can't take log of 2.75773e-308 at t/t.pl line 1.
> 
> that should have said:
> tausq@gsyprf11:~/build/perl-5.8.0$ /usr/bin/perl t/t.pl
> Can't take log of 0 at t/t.pl line 1.
> 
> interestingly, a debug build of perl (using -g and no -O flags) doesn't
> have the same problem, so this looks like some kind of compiler
> optimization bug. I've tried this with both 3.2.3 and 3.3... same
> problems.
> 
> would anyone like to try to look at this some more and see if they can
> isolate the C code/a small test case that is causing the problem?

Glibc's math tests are still failing even under gcc-3.3 (not to mention
the threading problems I'm in the middle of fixing).

Though I'm seeing more:

Failure: Real part of: cacos (NaN + inf i) == NaN - inf i: Exception "Invalid operation" set
Failure: Real part of: cacos (NaN - inf i) == NaN + inf i: Exception "Invalid operation" set
Failure: Real part of: cacos (NaN + NaN i) == NaN + NaN i: Exception "Invalid operation" set

Or:
Failure: Test: Imaginary part of: ctanh (NaN - 0 i) == NaN - 0 i
Result:
 is:          nan   nan
 should be:  -0.00000000000000000000e+00  -0x0.00000000000000000000p+0

Even with a new ulps, the tests were still failing.

c.