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cmake/Tests/RunCMake/FindPkgConfig/FindPkgConfig_LIBRARY_PATH....

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find_package(PkgConfig REQUIRED)
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/zot/lib/pkgconfig/zot.pc" "
prefix=${CMAKE_CURRENT_BINARY_DIR}/zot
libdir=\${prefix}/lib
Name: Zot
Description: Dummy packaget to test LIBRARY_DIR support
Version: 1.0
Libs: -L\${libdir} -lzot
")
# Create a "library" file to find in libdir.
set(CMAKE_FIND_LIBRARY_PREFIXES "prefix-")
set(CMAKE_FIND_LIBRARY_SUFFIXES "-suffix")
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/zot/lib/prefix-zot-suffix")
# 'pkg-config --libs' drops -L flags in PKG_CONFIG_SYSTEM_LIBRARY_PATH by default.
set(ENV{PKG_CONFIG_SYSTEM_LIBRARY_PATH} "${CMAKE_CURRENT_BINARY_DIR}/zot/lib")
# 'pkgconf --libs' also drops -L flags in LIBRARY_PATH by default.
set(ENV{LIBRARY_PATH} "${CMAKE_CURRENT_BINARY_DIR}/zot/lib")
set(ENV{PKG_CONFIG_PATH} "${CMAKE_CURRENT_BINARY_DIR}/zot/lib/pkgconfig")
pkg_check_modules(ZOT REQUIRED zot)
message(STATUS "ZOT_LIBRARIES='${ZOT_LIBRARIES}'")
message(STATUS "ZOT_LINK_LIBRARIES='${ZOT_LINK_LIBRARIES}'")
message(STATUS "ZOT_LDFLAGS='${ZOT_LDFLAGS}'")