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Re: Clapack on Cygwin revisited
- From: Mark Paulus <mark dot paulus at mci dot com>
- To: "cygwin at cygwin dot com" <cygwin at cygwin dot com>
- Cc: "kele at physics dot uoc dot gr" <kele at physics dot uoc dot gr>
- Date: Fri, 19 Nov 2004 15:40:10 -0700
- Subject: Re: Clapack on Cygwin revisited
Sounds like you might need a -L option
gcc -o testclapack testclapack.c -L<dir to library> lapack.a -cblaswr -lblas.a tmglib.a -latlas -lg2c
You can stack multiple -L options, one per directory (no space after the -L),
the same as the -I options.
the -l<libname> is a special convention that ONLY works when the libraries
have a physical name of lib<libname>.<a|so>. For instance
-lmath means that somewhere in a known location there is a file called
libmath.a or libmath.so. So, since the clapack libraries don't follow that
convention, you can't use the -l shortcut. You have to give it the full name.
On Fri, 19 Nov 2004 23:29:46 +0200, firstname.lastname@example.org wrote:
>My troubles with getting clapack to work on cygwin continue unfortunately. In
>particular, I completed a first run of all the suggested actions in the
>readme.install file (found on the clapack website) with some error 139's during
>that rather painful 16hour! long process.
>I downloaded a test programme from the clapack website (if it could be helpful I
>can attach it next time), saved it under the name of testclapack.c and tried to
>compile it. It seemed as if finding out how to compile a programme using
>clapack was really tough.
>Nonetheless, after several attepts I tried a couple
>of compilation commands with the likes of: gcc testclapack.c -llapack,
>gcc testclapack.c -llapack -lcblaswr -lcblas -latlas -lg2c (and any permutation
>of the options (=5! I guess..:p)) and always I was getting a:
>undefined reference to '_dgesvd_' collect2: ld returned 1 exit status.
>The dgesvd_ is a function (the only clapack function) in the testclapack.c
>I have installed atlas (actually I did that before installing clapack) and have
>put in the test programme the appropriate #include's (actually I #included all
>the *.h files I could find on /clapack...)
>Are there any ideas as to how I can compile a programme linking to a clapack
>I would be grateful of your help.
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