* g77 -lm doesn't work
@ 2001-01-01 5:19 Billinghurst, David (CRTS)
2001-01-01 15:59 ` Larry Hall (RFK Partners, Inc)
0 siblings, 1 reply; 2+ messages in thread
From: Billinghurst, David (CRTS) @ 2001-01-01 5:19 UTC (permalink / raw)
To: 'cygwin@sources.redhat.com'
Using cygwin 1.17-1, if I try to link any Fortran program with -lm I get the
error
/usr/lib/gcc-lib/i686-pc-cygwin/2.95.2-6/../../../../i686-pc-cygwin/lib/libm
.a(libcmain.o)(.text+0x7f): undefined reference to `WinMain@16'
collect2: ld returned 1 exit status
Now libm.a is a symbolic link to libcygwin.a. I believe the root cause is
linking libcygwin.a before libg2c.a since for any Fortran program I see
g77 foo.f OK
g77 foo.f -lm FAIL
g77 foo.f -lg2c -lm OK
g77 foo.f -lcygwin FAIL
g77 foo.f -lg2c -lcygwin OK
Now the obvious solution is to not use -lm, but then I have to edit
Makefiles (or even worse - hack Dejagnu so I can run the g77 testsuite).
Once upon a time the cygwin libm.a was an empty archive. Can we revert to
this?
+++++++++++++++++++++++++++++++++++++++++
(Mr) David Billinghurst
Comalco Research Centre
PO Box 316, Thomastown, Vic, Australia, 3074
Phone: +61 3 9469 0642
FAX: +61 3 9462 2700
Email: David.Billinghurst@riotinto.com.au
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: g77 -lm doesn't work
2001-01-01 5:19 g77 -lm doesn't work Billinghurst, David (CRTS)
@ 2001-01-01 15:59 ` Larry Hall (RFK Partners, Inc)
0 siblings, 0 replies; 2+ messages in thread
From: Larry Hall (RFK Partners, Inc) @ 2001-01-01 15:59 UTC (permalink / raw)
To: Billinghurst, David (CRTS), 'cygwin@sources.redhat.com'
At 08:19 AM 1/1/2001, Billinghurst, David (CRTS) wrote:
>Using cygwin 1.17-1, if I try to link any Fortran program with -lm I get the
>error
>
>/usr/lib/gcc-lib/i686-pc-cygwin/2.95.2-6/../../../../i686-pc-cygwin/lib/libm
>.a(libcmain.o)(.text+0x7f): undefined reference to `WinMain@16'
>collect2: ld returned 1 exit status
>
>Now libm.a is a symbolic link to libcygwin.a. I believe the root cause is
>linking libcygwin.a before libg2c.a since for any Fortran program I see
>
>g77 foo.f OK
>g77 foo.f -lm FAIL
>g77 foo.f -lg2c -lm OK
>g77 foo.f -lcygwin FAIL
>g77 foo.f -lg2c -lcygwin OK
>
>Now the obvious solution is to not use -lm, but then I have to edit
>Makefiles (or even worse - hack Dejagnu so I can run the g77 testsuite).
>Once upon a time the cygwin libm.a was an empty archive. Can we revert to
>this?
>
>+++++++++++++++++++++++++++++++++++++++++
>(Mr) David Billinghurst
>Comalco Research Centre
>PO Box 316, Thomastown, Vic, Australia, 3074
>Phone: +61 3 9469 0642
>FAX: +61 3 9462 2700
>Email: David.Billinghurst@riotinto.com.au
No, reverting isn't an option. Some packages look for certain functionality
in libm.a as part of their configure (if I remember correctly - and if not,
you'll find the precise answer in the mail archives!;-)) Perhaps this issue
could be resolved in the specs file (forgive me, I'm pretty ignorant of gcc
internals)?
Larry Hall lhall@rfk.com
RFK Partners, Inc. http://www.rfk.com
118 Washington Street (508) 893-9779 - RFK Office
Holliston, MA 01746 (508) 893-9889 - FAX
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