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Date: Tue, 27 Mar 2001 09:10:00 -0500
From: Jason Tishler <Jason DOT Tishler AT dothill DOT com>
To: Cygwin <cygwin AT sources DOT redhat DOT com>
Subject: Will libm.a always be a symlink? (or snapshot vs. release)
Message-ID: <20010327091000.B797@dothill.com>
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Organization: Dot Hill Systems Corp.

While testing Rob Collins pthread support with the 2001-03-25 snapshot,
I noticed that libm.a and libc.a were *not* symlinks to libcygwin.a as
has been the case up till 1.1.8-2.  Is this an inherent difference
between snapshots and releases?  Or, will 1.3.0 and later be this way too?

The reason why I'm bring this up is that when -lm is supplied during
linking and libm.a is *not* a symlink to libcygwin.a, then one will
get link errors such as the following:

    gcc -shared -Wl,--enable-auto-image-base \
    -Wl,--out-implib=libpython2.1.dll.a -o libpython2.1.dll \
    Modules/getbuildinfo.o ... -lm
    /usr/lib/libcygwin.a(ds00023.o)(.text+0x0): multiple definition of `__infinity'
    /usr/lib/libm.a(s_infconst.o)(.text+0x0): first defined here

IIRC, Cygwin binutils had been fixed to tolerate (i.e., ignore)
superfluous -lc and -lm options.  If so, then it seems that this only
works when libm.a and libc.a are symlinks.

Thanks,
Jason

-- 
Jason Tishler
Director, Software Engineering       Phone: +1 (732) 264-8770 x235
Dot Hill Systems Corp.               Fax:   +1 (732) 264-8798
82 Bethany Road, Suite 7             Email: Jason DOT Tishler AT dothill DOT com
Hazlet, NJ 07730 USA                 WWW:   http://www.dothill.com

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