[CMake] underscore mangling with blas and cmake

[Kelly Thompson]

Jack,

 

1.     As Michael mentioned - ensure that you are linking to the BLAS
library:

 

find_package(BLAS REQUIRED)

add_executable( foo ${sources} )

target_link_library( foo ${BLAS_LIBRARIES} )

 

2.     FYI - For the Makefile Generator, the object files are usually stored
in a subdirectory named 'CMakeFiles/<target_name>.dir'   You can run nm on
these *.o files to examine the name mangling.  When calling BLAS routines, I
normally need to append an underscore to the call from C++.

 

3.     Eventually, you may want to consider using the
FortranCInterface.cmake module to determine the current name mangling
system.  You can use this information along with CPP macros to ensure that
your code ports to other compilers/platforms.

 

-kt

 

 

From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] On Behalf Of
Jack Chessa
Sent: Sunday, October 23, 2011 9:25 PM
To: cmake at cmake.org
Subject: [CMake] underscore mangling with blas and cmake

 

I am new to cmake and have a question that I hope has a simple answer.  I am
building a simple C++ program that uses blas scopy.  I am using

 

find_package(BLAS REQUIRED)

 

to find blas on the system (OSX in this case), and the cmake step seems to
find it, but when I go to the make step I get the 

Undefined symbols:

  "_scopy_", referenced from:

      _main in blas_ex.cpp.o

 

I usually can fix this with the -fleading-underscore or
-fnoleading-underscore or -Dadd_... but I am not really sure what is going
on in the cmake build or the Makefile that cmake creates.  I don't see any
.o files to nm on either.  So my question is what is the best way to deal
with underscore issues in cmake?  Does anyone have a simple example for
using cmake to build a c++ program with blas or lapack.

 

Thanks

 

Jack Chessa

Associate Professor

Department of Mechanical Engineering

University of Texas at El Paso

Email:    jfchessa at utep.edu

Office:    A309

Voice:     (915) 747-6900

Fax:                        (915) 747-5019

Web:       http://utminers.utep.edu/jfchessa/index.html

 

 

 

 

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