How to set the search priority for library in cmake

Question

I was trying to install opencv in one machine. And I met with an issue: for the library libavcodec-dev there are two copies in the machine, /usr/local/lib and /usr/lib. The version in /usr/lib is compatible with opencv. But CMake found /usr/local/lib first. Could anyone help me? How to configure the cmake to find correct version? Thanks.

This question has extensive information on how to affect the linking of libs: http://stackoverflow.com/questions/1487752/how-do-i-instruct-cmake-to-look-for-libraries-installed-by-macports — Soren, May 07 '16 at 14:17

Soren · Answer 1 · 2016-05-08T03:35:59.470

3

To specify a specific lib "Foo" found exactly in /usr/lib you should use;

find_library(Foo foo PATHS /usr/lib NO_DEFAULT_PATH)

From the documentation;

If NO_DEFAULT_PATH is specified, then no additional paths are added to the search.

Documentation also goes on to say that the default search for libs are dictated and controlled by the CMAKE_LIBRARY_PATH env variable.

edited May 08 '16 at 03:35

answered May 07 '16 at 14:18

Soren

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I don't think this will work; it only appends the given `PATHS` to the *end* of the paths to search. – John Zwinck May 07 '16 at 15:26
Updated the answer -- have a look – Soren May 08 '16 at 03:36

score 1 · Answer 2 · answered May 07 '16 at 14:17

1

find_library(AVCODEC avcodec-dev PATHS /usr/lib NO_DEFAULT_PATH)

answered May 07 '16 at 14:17

John Zwinck

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Is there any general way to change the search path order? Since there are many libraries in such case. Thanks. – Alfred May 07 '16 at 14:37
@Alfred: I'm not really sure what you're asking now. – John Zwinck May 07 '16 at 15:26

How to set the search priority for library in cmake

2 Answers2