CODEWITHSUNDEEP
cmake
M.K. aka Grisu
M.K. aka Grisu

Reputation: 2398

Changed find_library behavior from CMake 2.8 to CMake 3.2

I have got the following problem while migrating from CMake 2.8.x to 3.2.x. Thereby, it seems that the internal behavior of find_library changed. Here is a minimal example which demonstrates my problem.

Consider that we are search for library called libopenblas.so which is located in /scratch/local_install/lib and /usr/lib/openblas-base. The LD_LIBRARY_PATH environment variable is set to /scratch/local_install/lib.

The CMakeLists.txt file is the following: 

PROJECT(TEST) 
cmake_minimum_required(VERSION 2.8)

SET(_libname "openblas") 
SET(_libdir  ENV LD_LIBRARY_PATH "/usr/lib/openblas-base")

find_library(OPENBLAS_LIBRARY
      NAMES ${_libname}
      HINTS ${_libdir}
      PATHS ${_libdir}
      )
MESSAGE("OPENBLAS: ${OPENBLAS_LIBRARY}")

If I execute this using CMake 2.8.7 or 2.8.12, I get 

OPENBLAS: /scratch/koehlerm/local_install/lib/libopenblas.so

If I configure the code using CMake 3.2.1, I get 

OPENBLAS: /usr/lib/openblas-base/libopenblas.so

which I only want to get if there is none libopenblas.so in the LD_LIBRARY_PATH. How can I restore the old behavior of CMake 2.8.x even if the code is configured with CMake 3.2.x?

Upvotes: 1

Views: 863

Answers (1)

usr1234567
usr1234567

Reputation: 23432

Use NO_DEFAULT_PATH for find_library, then it will ignore the default location. See the documentation.

To get the bahvior you want, use find_library twice. First with NO_DEFAULT_PATH and after that without. If it is found the first time, the result is cached and the second call including the default path is skipped. If nothing is found first, it will be re-run and look at the default paths, too.

Upvotes: 1

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