This is the mail archive of the
cygwin@sources.redhat.com
mailing list for the Cygwin project.
g77 -lm link problem [Re: Results for 2.97 20010115 (experimental) testsuite on i686-pc -cygwin]
- To: "'cygwin at cygwin dot com'" <cygwin at cygwin dot com>
- Subject: g77 -lm link problem [Re: Results for 2.97 20010115 (experimental) testsuite on i686-pc -cygwin]
- From: Mumit Khan <khan at NanoTech dot Wisc dot EDU>
- Date: Tue, 23 Jan 2001 21:09:48 -0600 (CST)
On Tue, 23 Jan 2001, Christopher Faylor wrote:
> On Wed, Jan 24, 2001 at 12:38:56AM -0000, Billinghurst, David (CRTS) wrote:
>
> I guess I was vainly hoping that someone would actually debug the
> problem or offer insight into the reason for the problem rather than
> saying "Just remove -lm! Works for me!"
The problem is that the g77 runtime library (libg2c) contains main, and
internal reordering of libraries by gcc driver causes the problem.
$ cat libm-bugf.f
program libm_bug
write (*,*) 'libm bug'
stop
end
Following causes a problem because g77 driver puts -lm before -lg2c
(use -v to see it):
$ g77 -o libm-bugf.exe libm-bugf.f -lm
/usr/lib/libm.a(libcmain.o)(.text+0x6a):libcmain.c: undefined reference
to `WinMain@16' collect2: ld returned 1 exit status
Following "fixes" the problem now that we know that libg2c must come
beforehand (use -v to see it):
$ g77 -o libm-bugf.exe libm-bugf.f -lg2c -lm
$
I know the symptom, but don't know the real problem, hence don't know
the solution (yet).
Regards,
Mumit
--
Want to unsubscribe from this list?
Check out: http://cygwin.com/ml/#unsubscribe-simple