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Bug 248

Summary: Is libgsl a bit broken?
Product: [Retired] Red Hat Linux Reporter: paulmatthews
Component: gslAssignee: David Lawrence <dkl>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: low    
Version: 5.2   
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 1998-12-03 17:16:02 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description paulmatthews 1998-12-01 12:31:56 UTC
Is libgsl a bit broken, or is just me? For example if I try
to compile this simple program :

  #include <math.h>
  #include <gsl_errno.h>
  #include <gsl_fft_real.h>
  #include <gsl_fft_halfcomplex.h>

  void main()
  {
   int i, n = 100;
   double data[n];
   gsl_fft_real_wavetable real_wavetable;

   for (i = 0; i < n; i++)
    data[i] = 0.0;

   for (i = n / 3; i < 2 * n / 3; i++)
    data[i] = 1.0;

   gsl_fft_real_wavetable_alloc( n, &real_wavetable );
   gsl_fft_real_init( n, &real_wavetable );
   gsl_fft_real( data, n, &real_wavetable );
   gsl_fft_real_wavetable_free( &real_wavetable );
 }

using :

  gcc -lgslfft -lgslerr -lm -o fft fft.c

The following errors occur :

  /tmp/cca007241.o: In function `main':
  /tmp/cca007241.o(.text+0x0): multiple definition of `main'
  /usr/lib/libgslfft.a(benchmark.o)(.text+0x0): first
defined here
  ld: Warning: size of symbol `main' changed from 1056 to
481 in /tmp/cca007241.o
  /tmp/cca007241.o: In function `main':
  /tmp/cca007241.o(.text+0x121): undefined reference to
`gsl_fft_real_wavetable_alloc'
  /tmp/cca007241.o(.text+0x134): undefined reference to
`gsl_fft_real_init'
  /tmp/cca007241.o(.text+0x14d): undefined reference to
`gsl_fft_real'
  /tmp/cca007241.o(.text+0x15c): undefined reference to
`gsl_fft_real_wavetable_free'

Comment 1 paulmatthews 1998-12-02 02:42:59 UTC
[Additional information] I downloaded the new gsl library from the gnu
site, compiled it up, rewrote the test program to fit the new api, and
it failed in exactly the same way.  Either they are doing something
consistently wrong, or I'm misssing something very obvious. If this is
a "your holding your mouth the wrong way" type of thing I'm going to
look silly...

Comment 2 paulmatthews 1998-12-02 12:07:59 UTC
[ARRG] No it's me. Where's my gun.

gcc -o fft fft.c -lgslfft -lgslerr -lm

This works OK. It's where you put the libraries on the command line. I
can't believe I've never noticed this before.