Re: [khan@NanoTech.Wisc.EDU: missing signgam problem [Re: perl/PDL]]

["J. Johnston" <jjohnstn at cygnus dot com>]

Christopher Faylor wrote:
> 
> Should this be fixed in newlib?
> 
> cgf
> 

It should.  The simple way to handle it is to change math.h to have:

#define signgam (_impure_ptr->_new._reent._gamma_signgam)

This mirrors the way stdio.h declares stdin/stdout/stderr.

-- Jeff J.

> ----- Forwarded message from Mumit Khan <khan@NanoTech.Wisc.EDU> -----
> 
> From: Mumit Khan <khan@NanoTech.Wisc.EDU>
> To: Jerome BENOIT <JGMBenoit@Wanadoo.fr>
> cc: Cygnus <cygwin@sourceware.cygnus.com>
> Subject: missing signgam problem [Re: perl/PDL]
> Date: Sat, 20 Jan 2001 17:55:28 -0600 (CST)
> In-Reply-To: <3A6A1AD8.4D81C9D8@Wanadoo.fr>
> 
> On Sun, 21 Jan 2001, Jerome BENOIT wrote:
> 
> > dllwrap --dllname Math.dll --driver-name gcc --dlltool dlltool
> > --export-all-symb
> > ols --as as --output-def libMath.def --output-lib libMath.a \
> >  -s -L/usr/local/lib Math.o blas.o eigens.o ndtri.o quiet_nan.o cpoly.o
> > simq.o s
> > vd.o const.o mtherr.o polevl.o
> > /usr/lib/perl5/5.6.1/cygwin/CORE/libperl5_6_1.a -
> > L/usr/lib -lm
> > dllwrap: no export definition file provided
> > dllwrap: creating one, but that may not be what you want
> > Math.o(.text+0xb8c2):Math.c: undefined reference to `signgam'
> [ ... ]
> 
> It's a bug in newlib (Cygwin's C library) math.h header. The variable
> signgam was changed to a macro, but the header file doesn't show that.
> 
> Please add the following 2 lines *before* signgam is used in the sources
> (use grep to find out), and if it works, I'll work up a patch after
> I figure out the right way to do this.
> 
> extern __IMPORT struct _reent reent_data;
> #define signgam reent_data._new._reent._gamma_signgam
> 
> Regards,
> Mumit
> 
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> ----- End forwarded message -----
> 
> --
> cgf@cygnus.com                        Red Hat, Inc.
> http://sources.redhat.com/            http://www.redhat.com/