From:	khan AT xraylith DOT wisc DOT edu (Mumit Khan)
Subject:	Missing signgam definition in libm [Re: problems with lgamma()]
13 May 1997 16:21:09 -0700 :
Approved:	cygnus DOT gnu-win32 AT cygnus DOT com
Distribution:	cygnus
Message-ID:	<9705122346.AA10143.cygnus.gnu-win32@modi.xraylith.wisc.edu>
Original-To:	warisawa AT pi DOT titech DOT ac DOT jp
Original-Cc:	gnu-win32 AT cygnus DOT com
In-Reply-To:	Your message of "Mon, 12 May 1997 19:08:01 +0900."
	<3376EC01 DOT 317B AT pi DOT titech DOT ac DOT jp>
Original-Sender:	owner-gnu-win32 AT cygnus DOT com

"Shin'ichi Warisawa" <warisawa AT pi DOT titech DOT ac DOT jp> writes:
> I'm having a trouble in compiling and liking a program listed as
> follows.
> 
> #include <stdio.h>
> #include <math.h>
> 
> main()
> {
>   double l;
>   l = lgamma(1);
>   printf("%lf\n", l);
> }
> 
> Compiling environment is on Win NT 4.0 with cygwin32 beta 18.
> 
> Compiling processes and messages are as follows:
> 
> bash$ gcc -o lgamma lgamma.c
> /tmp\cc0015931.o(.text+0x1b):lgamma.c: undefined reference to `lgamma'
> gcc: Internal compiler error: program ld got fatal signal 1
> 
> bash$ gcc -o lgamma lgamma.c -lm
> C:\gnuwin32\b18\H-i386-cygwin32\lib\gcc-lib\i386-cygwin32\cygnus-2.7.2-970404
> \../../../../i386-cygwin32\lib/libm.a(w_lgamma.o)(.text+0x7):w_lgamma.c:
> undefined reference to `signgam'
> gcc: Internal compiler error: program ld got fatal signal 1
> 

For some reason, the file s_signgam.c, where signgam is defined, wasn't
included in the 'obj' variable in the Makefile (it is there in the 
src one) and hence left out of the library. You can fix it one of 2 
ways:
    
    1. Get the file cdk/newlib/libm/math/s_signgam.c, compile it and put
       in libm, or
    
    2. temporarily, include the following in your program somewhere in a
       file scope:

       #ifdef __CYGWIN32__
       int signgam = 0;
       #endif
    
       and rebuild.

In any case, the compiler shouldn't be dying with internal compiler error,
and that's a bug. The Linux cross-compiler, btw, doesn't die, and simply
reports the linker error.

Mumit

Cc: "Shin'ichi Warisawa" <warisawa AT pi DOT titech DOT ac DOT jp>,
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