Thread: [Dev-C++] linker error when cross compiling thru cygwin

hey all,
 
I'm trying to use gsl to do some linear algebra, and right now I'm just trying to compile this example code from the gnu website:
 
 #include <stdio.h>
     #include <gsl/gsl_linalg.h>
    
     
     int
     main (void)
     {
       double a_data[] = { 0.18, 0.60, 0.57, 0.96,
                           0.41, 0.24, 0.99, 0.58,
                           0.14, 0.30, 0.97, 0.66,
                           0.51, 0.13, 0.19, 0.85 };
     
       double b_data[] = { 1.0, 2.0, 3.0, 4.0 };
     
       gsl_matrix_view m 
         = gsl_matrix_view_array (a_data, 4, 4);
     
       gsl_vector_view b
         = gsl_vector_view_array (b_data, 4);
     
       gsl_vector *x = gsl_vector_alloc (4);
       
       int s;
     
       gsl_permutation * p = gsl_permutation_alloc (4);
     
       gsl_linalg_LU_decomp (&m.matrix, p, &s);
     
       gsl_linalg_LU_solve (&m.matrix, p, &b.vector, x);
     
       printf ("x = \n");
       gsl_vector_fprintf (stdout, x, "%g");
     
       gsl_permutation_free (p);
       gsl_vector_free (x);
       return 0;
     }
 
 
 I'm using a crosstool through cygwin to compile for an ARM processor. The compile log looks like this:
 
Building Makefile: "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win"
Executing  make...
make.exe -f "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win" all
arm-unknown-linux-gnu-gcc.exe test-gsl.o  -o "gsl-test.exe" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib" -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/usr/include -lgsl -lm -lgslcblas  
 
Building Makefile: "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win"
Executing  make...
make.exe -f "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win" all
arm-unknown-linux-gnu-gcc.exe test-gsl.o  -o "gsl-test.exe" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/arm-unknown-linux-gnu/lib" -L"C:/cygwin/lib" -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/usr/include -lgsl -lm -lgslcblas  
 
test-gsl.o(.text+0x60): In function `main':
: undefined reference to `gsl_matrix_view_array'
test-gsl.o(.text+0x78): In function `main':
: undefined reference to `gsl_vector_view_array'
test-gsl.o(.text+0x80): In function `main':
: undefined reference to `gsl_vector_alloc'
test-gsl.o(.text+0x90): In function `main':
: undefined reference to `gsl_permutation_alloc'
test-gsl.o(.text+0xac): In function `main':
: undefined reference to `gsl_linalg_LU_decomp'
test-gsl.o(.text+0xc4): In function `main':
: undefined reference to `gsl_linalg_LU_solve'
test-gsl.o(.text+0xe0): In function `main':
: undefined reference to `gsl_vector_fprintf'
test-gsl.o(.text+0xe8): In function `main':
: undefined reference to `gsl_permutation_free'
test-gsl.o(.text+0xf0): In function `main':
: undefined reference to `gsl_vector_free'
collect2: ld returned 1 exit status
make.exe: *** [gsl-test.exe] Error 1
 
Execution terminated
 
the reason that this confuses me is that I have the libraries stored in: C:\cygwin\lib  and the includes for gsl in: C:\cygwin\usr\include.  If anybody can help me out I will be eternally grateful.
 
 
TMR
 
 

You don't specify what library to use.

C and C++ do not automagically try all libraries, just because you add
them in your search path. -L <directory> just tells the linker where to
look for a library that you have explicitly included in the linking. There
are a few exceptions, which allows the standard RTL to be linked without
you specifying the name.

If you somewhere in all the library directories you specified has a file
named libgsl.a, then you should have had a -lgsl to tell the linker to
make use of this gsl library.

/pwm

On Mon, 14 Jul 2008, Tim Rambo wrote:

> hey all,
>
> I'm trying to use gsl to do some linear algebra, and right now I'm just trying to compile this example code from the gnu website:
>
>  #include <stdio.h>
>      #include <gsl/gsl_linalg.h>
>
>
>      int
>      main (void)
>      {
>        double a_data[] = { 0.18, 0.60, 0.57, 0.96,
>                            0.41, 0.24, 0.99, 0.58,
>                            0.14, 0.30, 0.97, 0.66,
>                            0.51, 0.13, 0.19, 0.85 };
>
>        double b_data[] = { 1.0, 2.0, 3.0, 4.0 };
>
>        gsl_matrix_view m
>          = gsl_matrix_view_array (a_data, 4, 4);
>
>        gsl_vector_view b
>          = gsl_vector_view_array (b_data, 4);
>
>        gsl_vector *x = gsl_vector_alloc (4);
>
>        int s;
>
>        gsl_permutation * p = gsl_permutation_alloc (4);
>
>        gsl_linalg_LU_decomp (&m.matrix, p, &s);
>
>        gsl_linalg_LU_solve (&m.matrix, p, &b.vector, x);
>
>        printf ("x = \n");
>        gsl_vector_fprintf (stdout, x, "%g");
>
>        gsl_permutation_free (p);
>        gsl_vector_free (x);
>        return 0;
>      }
>
>
>  I'm using a crosstool through cygwin to compile for an ARM processor. The compile log looks like this:
>
> Building Makefile: "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win"
> Executing  make...
> make.exe -f "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win" all
> arm-unknown-linux-gnu-gcc.exe test-gsl.o  -o "gsl-test.exe" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib" -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/usr/include -lgsl -lm -lgslcblas
>
> Building Makefile: "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win"
> Executing  make...
> make.exe -f "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win" all
> arm-unknown-linux-gnu-gcc.exe test-gsl.o  -o "gsl-test.exe" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/arm-unknown-linux-gnu/lib" -L"C:/cygwin/lib" -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/usr/include -lgsl -lm -lgslcblas
>
> test-gsl.o(.text+0x60): In function `main':
> : undefined reference to `gsl_matrix_view_array'
> test-gsl.o(.text+0x78): In function `main':
> : undefined reference to `gsl_vector_view_array'
> test-gsl.o(.text+0x80): In function `main':
> : undefined reference to `gsl_vector_alloc'
> test-gsl.o(.text+0x90): In function `main':
> : undefined reference to `gsl_permutation_alloc'
> test-gsl.o(.text+0xac): In function `main':
> : undefined reference to `gsl_linalg_LU_decomp'
> test-gsl.o(.text+0xc4): In function `main':
> : undefined reference to `gsl_linalg_LU_solve'
> test-gsl.o(.text+0xe0): In function `main':
> : undefined reference to `gsl_vector_fprintf'
> test-gsl.o(.text+0xe8): In function `main':
> : undefined reference to `gsl_permutation_free'
> test-gsl.o(.text+0xf0): In function `main':
> : undefined reference to `gsl_vector_free'
> collect2: ld returned 1 exit status
> make.exe: *** [gsl-test.exe] Error 1
>
> Execution terminated
>
> the reason that this confuses me is that I have the libraries stored in: C:\cygwin\lib  and the includes for gsl in: C:\cygwin\usr\include.  If anybody can help me out I will be eternally grateful.
>
>
> TMR
>
>
>

Actually, if you look at the end of the compile log, I did.
 
> Building Makefile: "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win"
> Executing  make...
> make.exe -f "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win" all
> arm-unknown-linux-gnu-gcc.exe test-gsl.o  -o "gsl-test.exe" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/arm-unknown-linux-gnu/lib" -L"C:/cygwin/lib" -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/usr/include -lgsl -lm -lgslcblas
I've been thinking that its possible the library needs to be built using my crosstool, does this sound reasonable?  have been attempting to get gsl built with my crosstool in cygwin. but I am having problems with that as well.
 

>>> Per Westermark <pw...@ia...> 7/17/2008 8:11 PM >>>
You don't specify what library to use.

C and C++ do not automagically try all libraries, just because you add
them in your search path. -L <directory> just tells the linker where to
look for a library that you have explicitly included in the linking. There
are a few exceptions, which allows the standard RTL to be linked without
you specifying the name.

If you somewhere in all the library directories you specified has a file
named libgsl.a, then you should have had a -lgsl to tell the linker to
make use of this gsl library.

/pwm

On Mon, 14 Jul 2008, Tim Rambo wrote:

> hey all,
>
> I'm trying to use gsl to do some linear algebra, and right now I'm just trying to compile this example code from the gnu website:
>
>  #include <stdio.h>
>      #include <gsl/gsl_linalg.h>
>
>
>      int
>      main (void)
>      {
>        double a_data[] = { 0.18, 0.60, 0.57, 0.96,
>                            0.41, 0.24, 0.99, 0.58,
>                            0.14, 0.30, 0.97, 0.66,
>                            0.51, 0.13, 0.19, 0.85 };
>
>        double b_data[] = { 1.0, 2.0, 3.0, 4.0 };
>
>        gsl_matrix_view m
>          = gsl_matrix_view_array (a_data, 4, 4);
>
>        gsl_vector_view b
>          = gsl_vector_view_array (b_data, 4);
>
>        gsl_vector *x = gsl_vector_alloc (4);
>
>        int s;
>
>        gsl_permutation * p = gsl_permutation_alloc (4);
>
>        gsl_linalg_LU_decomp (&m.matrix, p, &s);
>
>        gsl_linalg_LU_solve (&m.matrix, p, &b.vector, x);
>
>        printf ("x = \n");
>        gsl_vector_fprintf (stdout, x, "%g");
>
>        gsl_permutation_free (p);
>        gsl_vector_free (x);
>        return 0;
>      }
>
>
>  I'm using a crosstool through cygwin to compile for an ARM processor. The compile log looks like this:
>
> Building Makefile: "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win"
> Executing  make...
> make.exe -f "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win" all
> arm-unknown-linux-gnu-gcc.exe test-gsl.o  -o "gsl-test.exe" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib" -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/usr/include -lgsl -lm -lgslcblas
>
> Building Makefile: "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win"
> Executing  make...
> make.exe -f "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win" all
> arm-unknown-linux-gnu-gcc.exe test-gsl.o  -o "gsl-test.exe" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/arm-unknown-linux-gnu/lib" -L"C:/cygwin/lib" -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/usr/include -lgsl -lm -lgslcblas
>
> test-gsl.o(.text+0x60): In function `main':
> : undefined reference to `gsl_matrix_view_array'
> test-gsl.o(.text+0x78): In function `main':
> : undefined reference to `gsl_vector_view_array'
> test-gsl.o(.text+0x80): In function `main':
> : undefined reference to `gsl_vector_alloc'
> test-gsl.o(.text+0x90): In function `main':
> : undefined reference to `gsl_permutation_alloc'
> test-gsl.o(.text+0xac): In function `main':
> : undefined reference to `gsl_linalg_LU_decomp'
> test-gsl.o(.text+0xc4): In function `main':
> : undefined reference to `gsl_linalg_LU_solve'
> test-gsl.o(.text+0xe0): In function `main':
> : undefined reference to `gsl_vector_fprintf'
> test-gsl.o(.text+0xe8): In function `main':
> : undefined reference to `gsl_permutation_free'
> test-gsl.o(.text+0xf0): In function `main':
> : undefined reference to `gsl_vector_free'
> collect2: ld returned 1 exit status
> make.exe: *** [gsl-test.exe] Error 1
>
> Execution terminated
>
> the reason that this confuses me is that I have the libraries stored in: C:\cygwin\lib  and the includes for gsl in: C:\cygwin\usr\include.  If anybody can help me out I will be eternally grateful.
>
>
> TMR
>
>
>

Oops, yes you are correct - I missed that one.

It is so common that people only includes their header files and specify
the correct library directories that I more or less take for granted that
the actual -lxx parameter is missing :)

/pwm

On Fri, 18 Jul 2008, Tim Rambo wrote:

> Actually, if you look at the end of the compile log, I did.
>
> > Building Makefile: "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win"
> > Executing  make...
> > make.exe -f "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win" all
> > arm-unknown-linux-gnu-gcc.exe test-gsl.o  -o "gsl-test.exe" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/arm-unknown-linux-gnu/lib" -L"C:/cygwin/lib" -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/usr/include -lgsl -lm -lgslcblas
> I've been thinking that its possible the library needs to be built using my crosstool, does this sound reasonable?  have been attempting to get gsl built with my crosstool in cygwin. but I am having problems with that as well.
>
>
> >>> Per Westermark <pw...@ia...> 7/17/2008 8:11 PM >>>
> You don't specify what library to use.
>
> C and C++ do not automagically try all libraries, just because you add
> them in your search path. -L <directory> just tells the linker where to
> look for a library that you have explicitly included in the linking. There
> are a few exceptions, which allows the standard RTL to be linked without
> you specifying the name.
>
> If you somewhere in all the library directories you specified has a file
> named libgsl.a, then you should have had a -lgsl to tell the linker to
> make use of this gsl library.
>
> /pwm
>
> On Mon, 14 Jul 2008, Tim Rambo wrote:
>
> > hey all,
> >
> > I'm trying to use gsl to do some linear algebra, and right now I'm just trying to compile this example code from the gnu website:
> >
> >  #include <stdio.h>
> >      #include <gsl/gsl_linalg.h>
> >
> >
> >      int
> >      main (void)
> >      {
> >        double a_data[] = { 0.18, 0.60, 0.57, 0.96,
> >                            0.41, 0.24, 0.99, 0.58,
> >                            0.14, 0.30, 0.97, 0.66,
> >                            0.51, 0.13, 0.19, 0.85 };
> >
> >        double b_data[] = { 1.0, 2.0, 3.0, 4.0 };
> >
> >        gsl_matrix_view m
> >          = gsl_matrix_view_array (a_data, 4, 4);
> >
> >        gsl_vector_view b
> >          = gsl_vector_view_array (b_data, 4);
> >
> >        gsl_vector *x = gsl_vector_alloc (4);
> >
> >        int s;
> >
> >        gsl_permutation * p = gsl_permutation_alloc (4);
> >
> >        gsl_linalg_LU_decomp (&m.matrix, p, &s);
> >
> >        gsl_linalg_LU_solve (&m.matrix, p, &b.vector, x);
> >
> >        printf ("x = \n");
> >        gsl_vector_fprintf (stdout, x, "%g");
> >
> >        gsl_permutation_free (p);
> >        gsl_vector_free (x);
> >        return 0;
> >      }
> >
> >
> >  I'm using a crosstool through cygwin to compile for an ARM processor. The compile log looks like this:
> >
> > Building Makefile: "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win"
> > Executing  make...
> > make.exe -f "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win" all
> > arm-unknown-linux-gnu-gcc.exe test-gsl.o  -o "gsl-test.exe" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib" -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/usr/include -lgsl -lm -lgslcblas
> >
> > Building Makefile: "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win"
> > Executing  make...
> > make.exe -f "C:\Documents and Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win" all
> > arm-unknown-linux-gnu-gcc.exe test-gsl.o  -o "gsl-test.exe" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib" -L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/arm-unknown-linux-gnu/lib" -L"C:/cygwin/lib" -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/lib -L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/usr/include -lgsl -lm -lgslcblas
> >
> > test-gsl.o(.text+0x60): In function `main':
> > : undefined reference to `gsl_matrix_view_array'
> > test-gsl.o(.text+0x78): In function `main':
> > : undefined reference to `gsl_vector_view_array'
> > test-gsl.o(.text+0x80): In function `main':
> > : undefined reference to `gsl_vector_alloc'
> > test-gsl.o(.text+0x90): In function `main':
> > : undefined reference to `gsl_permutation_alloc'
> > test-gsl.o(.text+0xac): In function `main':
> > : undefined reference to `gsl_linalg_LU_decomp'
> > test-gsl.o(.text+0xc4): In function `main':
> > : undefined reference to `gsl_linalg_LU_solve'
> > test-gsl.o(.text+0xe0): In function `main':
> > : undefined reference to `gsl_vector_fprintf'
> > test-gsl.o(.text+0xe8): In function `main':
> > : undefined reference to `gsl_permutation_free'
> > test-gsl.o(.text+0xf0): In function `main':
> > : undefined reference to `gsl_vector_free'
> > collect2: ld returned 1 exit status
> > make.exe: *** [gsl-test.exe] Error 1
> >
> > Execution terminated
> >
> > the reason that this confuses me is that I have the libraries stored in: C:\cygwin\lib  and the includes for gsl in: C:\cygwin\usr\include.  If anybody can help me out I will be eternally grateful.
> >
> >
> > TMR
> >
> >
> >
>
>

 
Hi  All;
    I would like to compile and run a multithreaded cppluss program
using pthread library how is this done. 
 
 

 

 HYPERLINK "outbind://35/Wally_files/image001.gif"

NWallen

 

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of Tim
Rambo
Sent: Friday, July 18, 2008 8:24 AM
To: Per Westermark
Cc: dev...@li...
Subject: Re: [Dev-C++] linker error when cross compiling thru cygwin


Actually, if you look at the end of the compile log, I did.
 
> Building Makefile: "C:\Documents and
Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win"
> Executing  make...
> make.exe -f "C:\Documents and Settings\student\Desktop\sepatriot\spa
pc\gsl-test\Makefile.win" all
> arm-unknown-linux-gnu-gcc.exe test-gsl.o  -o "gsl-test.exe"
-L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/l
ib"
-L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/a
rm-unknown-linux-gnu/lib" -L"C:/cygwin/lib"
-L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-li
nux-gnu/lib
-L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-li
nux-gnu/usr/include -lgsl -lm -lgslcblas

I've been thinking that its possible the library needs to be built using
my crosstool, does this sound reasonable?  have been attempting to get
gsl built with my crosstool in cygwin. but I am having problems with
that as well.
 

>>> Per Westermark <pw...@ia...> 7/17/2008 8:11 PM >>>
You don't specify what library to use.

C and C++ do not automagically try all libraries, just because you add
them in your search path. -L <directory> just tells the linker where to
look for a library that you have explicitly included in the linking.
There
are a few exceptions, which allows the standard RTL to be linked without
you specifying the name.

If you somewhere in all the library directories you specified has a file
named libgsl.a, then you should have had a -lgsl to tell the linker to
make use of this gsl library.

/pwm

On Mon, 14 Jul 2008, Tim Rambo wrote:

> hey all,
>
> I'm trying to use gsl to do some linear algebra, and right now I'm
just trying to compile this example code from the gnu website:
>
>  #include <stdio.h>
>      #include <gsl/gsl_linalg.h>
>
>
>      int
>      main (void)
>      {
>        double a_data[] = { 0.18, 0.60, 0.57, 0.96,
>                            0.41, 0.24, 0.99, 0.58,
>                            0.14, 0.30, 0.97, 0.66,
>                            0.51, 0.13, 0.19, 0.85 };
>
>        double b_data[] = { 1.0, 2.0, 3.0, 4.0 };
>
>        gsl_matrix_view m
>          = gsl_matrix_view_array (a_data, 4, 4);
>
>        gsl_vector_view b
>          = gsl_vector_view_array (b_data, 4);
>
>        gsl_vector *x = gsl_vector_alloc (4);
>
>        int s;
>
>        gsl_permutation * p = gsl_permutation_alloc (4);
>
>        gsl_linalg_LU_decomp (&m.matrix, p, &s);
>
>        gsl_linalg_LU_solve (&m.matrix, p, &b.vector, x);
>
>        printf ("x = \n");
>        gsl_vector_fprintf (stdout, x, "%g");
>
>        gsl_permutation_free (p);
>        gsl_vector_free (x);
>        return 0;
>      }
>
>
>  I'm using a crosstool through cygwin to compile for an ARM processor.
The compile log looks like this:
>
> Building Makefile: "C:\Documents and
Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win"
> Executing  make...
> make.exe -f "C:\Documents and Settings\student\Desktop\sepatriot\spa
pc\gsl-test\Makefile.win" all
> arm-unknown-linux-gnu-gcc.exe test-gsl.o  -o "gsl-test.exe"
-L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/l
ib"
-L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-li
nux-gnu/lib
-L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-li
nux-gnu/usr/include -lgsl -lm -lgslcblas
>
> Building Makefile: "C:\Documents and
Settings\student\Desktop\sepatriot\spa pc\gsl-test\Makefile.win"
> Executing  make...
> make.exe -f "C:\Documents and Settings\student\Desktop\sepatriot\spa
pc\gsl-test\Makefile.win" all
> arm-unknown-linux-gnu-gcc.exe test-gsl.o  -o "gsl-test.exe"
-L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/l
ib"
-L"C:/cygwin/opt/crosstool/gcc-3.3.4-glibc-2.3.2/arm-unknown-linux-gnu/a
rm-unknown-linux-gnu/lib" -L"C:/cygwin/lib"
-L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-li
nux-gnu/lib
-L/cygdrive/c/cygwin/opt/crosstool//gcc-3.3.4-glibc-2.3.2/arm-unknown-li
nux-gnu/usr/include -lgsl -lm -lgslcblas
>
> test-gsl.o(.text+0x60): In function `main':
> : undefined reference to `gsl_matrix_view_array'
> test-gsl.o(.text+0x78): In function `main':
> : undefined reference to `gsl_vector_view_array'
> test-gsl.o(.text+0x80): In function `main':
> : undefined reference to `gsl_vector_alloc'
> test-gsl.o(.text+0x90): In function `main':
> : undefined reference to `gsl_permutation_alloc'
> test-gsl.o(.text+0xac): In function `main':
> : undefined reference to `gsl_linalg_LU_decomp'
> test-gsl.o(.text+0xc4): In function `main':
> : undefined reference to `gsl_linalg_LU_solve'
> test-gsl.o(.text+0xe0): In function `main':
> : undefined reference to `gsl_vector_fprintf'
> test-gsl.o(.text+0xe8): In function `main':
> : undefined reference to `gsl_permutation_free'
> test-gsl.o(.text+0xf0): In function `main':
> : undefined reference to `gsl_vector_free'
> collect2: ld returned 1 exit status
> make.exe: *** [gsl-test.exe] Error 1
>
> Execution terminated
>
> the reason that this confuses me is that I have the libraries stored
in: C:\cygwin\lib  and the includes for gsl in: C:\cygwin\usr\include.
If anybody can help me out I will be eternally grateful.
>
>
> TMR
>
>
>




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Noel Wallen wrote:
>  
> Hi  All;
>     I would like to compile and run a multithreaded cppluss program 
> using pthread library how is this done.

Perhaps you should learn how to use a mailing list first?  You should 
probably start a new thread, instead of hijacking someone else's.  In 
common speak, what you've done is rude.

Also try using Google.  A simple search for "pthreads howto" turned up 
this excellent resource:

http://www.yolinux.com/TUTORIALS/LinuxTutorialPosixThreads.html

I would also glean that you need further training in how to use a 
keyboard effectively, as I've never seen the "cppluss" language before. 
  I assume you're really talking about C++, which is a very popular 
language.  If this new "cppluss" language is somehow superior to C++ in 
some way, please let me know, since I'd be very interested to see it!

-- 
Registered Linux Addict #431495
http://profile.xfire.com/mrstalinman | John 3:16!
http://www.fsdev.net/ | http://lordsauron.wordpress.com/