Re: [Help-gsl] Need help specifying build/host/target to configure

[Michael G Soyka]

Brian Gough wrote:
> At Sat, 11 Oct 2008 11:30:29 -0400,
> Michael G Soyka wrote:
>   
> > Question 1.
> > The configure script takes 3 arguments that appear to be relevant: 
> > "--build", "--host", and "--target".  Although the GNU Standards file 
> > talks about them, I'm still unclear as to which ones I should use.  
> > Could someone please explain the differences between them.  I have tried:
> >
> >     --build=sparc-sun-solaris2.7
> >     --host=sparc-sun-solaris2.7
> >     --target=ppc-ibm-mcos
> >
> >     
>
> To cross compile use --host=ppc-ibm-mcos (the type of system on which
> the package runs).  
>
>   
> > Question 2.
> > What are these .lo and .la files created by the Makefiles?
> >     
>
> These are libtool files.  The actual .a files can be found in the .libs
> subdirectories.
>
>   
> > Question 3.
> > What does "libtool" do?
> >     
>
> It is a wrapper around the compiler to compile static and dynamically
> linked versions of a library at the same time.
>
>   
Brian,

Thank you for taking the time to reply.  In the interim between my 
message and your reply, I found out that libtool and autoconf are Gnu 
products, found the docs, and came up with the same answers.  However, I 
still have not been able to get configure to work as designed; here's 
what's happened.

1.  I defined environment variables CC, CFLAGS, AR, LD, etc for the 
cross development compiler and utilities and then invoked configure with 
--build, --host and --disable-shared.
2.  configure knows nothing of my OS choice "mcos" for host. 
3.  I then specified ac_cv_host=ppc-ibm-mcos and configure said "If you 
meant to cross compile, use --host". 
4.  I added "cross_compile=yes" to configure's command line and it ran 
to completion, hoo-hah!
5.  trying to build, I got a "don't know how to build strdup.oppc.oppc" 
error (rather similar to my original Question 2 issue). 

By the way, my original post applied to version 1.8 but I've since 
upgraded to 1.11 with the same results. 

Not having the time, experience or desire to dig further,  I wrote a 
shell script to create the Makefiles and customized the config.h file by 
hand.  Now I have the library running on the target board. 

Nonetheless, I'd still like to do this right way, as God and Gnu 
intended.  I also will need to do this for a vxWorks system and so any 
suggestions or insights anyone may have will be welcomed.

Mike