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

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

 

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-----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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Checked by AVG Free Edition. 
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