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cmake: allow looking for optional libraries

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And use this to look for libusb.
If it's there then libdivecomputer likely was linked against it. If it isn't
then we don't need it, either.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Dirk Hohndel 2015-04-10 12:08:26 -07:00
parent 25467aa85a
commit 7596db28b5
2 changed files with 7 additions and 6 deletions
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4
cmake/Modules/pkgconfig_helper.cmake
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@ -1,5 +1,5 @@
MACRO(pkg_config_library LIBNAME pcfile)
pkg_check_modules(${LIBNAME} REQUIRED ${pcfile})
MACRO(pkg_config_library LIBNAME pcfile option)
pkg_check_modules(${LIBNAME} ${option} ${pcfile})
include_directories(${${LIBNAME}_INCLUDE_DIRS})
link_directories(${${LIBNAME}_LIBRARY_DIRS})
add_definitions(${${LIBNAME}_CFLAGS_OTHER})