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Re: linking qsort with gfortran

On 12/21/2012 7:58 PM, wrote:
First, apologies if this question has been answered elsewhere or I am doing something really stupid. I have searched for several hours for a solution to my problem with no success.

I am trying to do a GCC build of a mix of C and Fortran source that has been successfully compiled for many years with both the PGI and Intel compilers. I have one Fortran routine that calls "qsort", a sorting routine provided in most libraries. I know it is provided in the GCC libraries. However, because the call is from Fortran code, it will properly link with the library and I get this error:

Undefined symbols for architecture x86_64:
   "_qsort_", referenced from:

I understand that the trailing underscore is the problem, but I cannot use the "no-underscoring" compiler flags because the code also links to other libraries that do provide the underscore which then breaks everything else. I am using gfortran to do the linking though I get the same error with gcc. I am using version 4.8 currently but get the same error with 4.7. Everything is on OS X, 10.7.

Any help would be greatly appreciated. Thank you.


If there is no Fortran wrapper for qsort in your library you should be able to call it via iso_c_binding. qsort isn't in a gcc library, usually it's glibc, although I don't know mac specifics.

Tim Prince

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