Cmake external optional package add

Question

I'm new to Cmake and trying to build a KDE project (okular) which requires an optional package(libspectre). I did a default make install and the library files are in the location "/usr/lib/x86_64-linux-gnu".

In the generators/CMakeLists.txt, I tried to replace the "macro_optional_find_package(LibSpectre)" with the following:

find_library(LIBSPECTRE_LIBRARY NAMES libspectre PATHS "/usr/lib/x86_64-linux-gnu/")

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(LibSpectre DEFAULT_MSG LIBSPECTRE_LIBRARY)

Which seems to not find the libspectre library. I tried replacing PATHS with HINTS and also changing 'libspectre' to 'spectre' after NAMES. But it doesn't seem to recognize.

Any help is appreciated!

What is exact name (with extension) of the library's file (under /usr/lib/x86_64-linux-gnu/) which you want to find? Are you sure, that given find_library() call is executed? (Try to add message() call after it). As you build project for yourself, it is better just to set LIBSPECTRE_LIBRARY variable in CMake cache. No needs to modify scripts for that. — Tsyvarev
Hi, The name of the library file is libspectre.so.1. It's a symlink to libspectre.so.1.1.7. I will try your suggestions. Thanks! — fastforward

Tsyvarev Tsyvarev · Accepted Answer · 2016-09-30T21:05:27

CMake doesn't aware about library's so-version, it checks only precize .so extension.

You may create libspectre.so - symlink to libspectre.so.1. So

find_library(LIBSPECTRE_LIBRARY NAMES spectre PATHS "/usr/lib/x86_64-linux-gnu/")

will work.

Cmake external optional package add

1 Answers