Fix CMake Glib detection

Restores the original `FindGLib2.cmake` file with two modifications:
First, `FOUND_VAR` has been removed (it's ignored anyway). Second, I set
`set(FPHSA_NAME_MISMATCHED TRUE)` because
`find_package_handle_standard_args` is called for each component and the
mismatched names are expected.

CMakeLists.txt

@@ -1,14 +1,15 @@
 cmake_minimum_required(VERSION 3.1)
 
+cmake_policy(SET CMP0111 NEW)
+
 project(lcm)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 if(CMAKE_VERSION VERSION_LESS 3.7)
   list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/3.7")
 endif()
 
-find_package(PkgConfig REQUIRED)
-pkg_check_modules(GLIB REQUIRED glib-2.0)
+find_package(GLib2 REQUIRED)
 
 # Configuration and utility functions
 include(lcm-cmake/config.cmake NO_POLICY_SCOPE)

cmake/FindGLib2.cmake

@@ -0,0 +1,124 @@
+# Find glib-2.0 and optional related components
+
+include(FindPackageHandleStandardArgs)
+
+# This is set because `find_package_handle_standard_args` is also used for each
+# component of GLib2, e.g., `GLib2_glid`, `GLib2_gio`, etc.
+set(FPHSA_NAME_MISMATCHED TRUE)
+
+#------------------------------------------------------------------------------
+function(_glib2_find_include VAR HEADER)
+  list(APPEND CMAKE_PREFIX_PATH $ENV{GLIB_PATH})
+
+  set(_paths)
+  foreach(_lib ${ARGN})
+    get_filename_component(_libpath ${GLIB2_${_lib}_LIBRARY} DIRECTORY)
+    list(APPEND _paths ${_libpath})
+  endforeach()
+
+  find_path(GLIB2_${VAR}_INCLUDE_DIR ${HEADER}
+    PATHS ${_paths}
+    PATH_SUFFIXES glib-2.0 glib-2.0/include
+  )
+  mark_as_advanced(GLIB2_${VAR}_INCLUDE_DIR)
+endfunction()
+
+#------------------------------------------------------------------------------
+function(_glib2_find_library VAR LIB)
+  list(APPEND CMAKE_PREFIX_PATH $ENV{GLIB_PATH})
+
+  if(WIN32)
+	set(CMAKE_FIND_LIBRARY_SUFFIXES ".dll.a")
+	set(CMAKE_FIND_LIBRARY_PREFIXES "lib")
+  endif()
+  find_library(GLIB2_${VAR}_LIBRARY NAMES ${LIB}-2.0 ${LIB})
+  mark_as_advanced(GLIB2_${VAR}_LIBRARY)
+
+  if(WIN32)
+    find_program(GLIB2_${VAR}_RUNTIME NAMES lib${LIB}-2.0-0.dll)
+    mark_as_advanced(GLIB2_${VAR}_RUNTIME)
+  endif()
+endfunction()
+
+#------------------------------------------------------------------------------
+function(_glib2_add_target TARGET LIBRARY)
+  set(GLIB2_${TARGET}_FIND_QUIETLY TRUE)
+  set(_deps GLIB2_${LIBRARY}_LIBRARY)
+  foreach(_include ${ARGN})
+    list(APPEND _deps GLIB2_${_include}_INCLUDE_DIR)
+  endforeach()
+
+  find_package_handle_standard_args(GLib2_${TARGET}
+    REQUIRED_VARS ${_deps}
+  )
+
+  if(GLib2_${TARGET}_FOUND)
+    set(GLib2_${TARGET}_FOUND TRUE PARENT_SCOPE)
+
+    set(_target GLib2::${TARGET})
+    add_library(${_target} UNKNOWN IMPORTED)
+    set_property(TARGET ${_target} APPEND PROPERTY
+      IMPORTED_LOCATION ${GLIB2_${LIBRARY}_LIBRARY}
+    )
+    foreach(_include ${ARGN})
+      set_property(TARGET ${_target} APPEND PROPERTY
+        INTERFACE_INCLUDE_DIRECTORIES ${GLIB2_${_include}_INCLUDE_DIR}
+      )
+    endforeach()
+  endif()
+endfunction()
+
+###############################################################################
+
+_glib2_find_library(GLIB glib)
+_glib2_find_include(GLIB glib.h)
+_glib2_find_include(GLIBCONFIG glibconfig.h GLIB)
+
+_glib2_add_target(glib GLIB GLIB GLIBCONFIG)
+
+if(WIN32 AND TARGET GLib2::glib)
+  set_property(TARGET GLib2::glib APPEND PROPERTY
+    INTERFACE_LINK_LIBRARIES ws2_32 winmm
+  )
+endif()
+
+foreach(_glib2_component ${GLib2_FIND_COMPONENTS})
+
+  if(_glib2_component STREQUAL "gio")
+
+    _glib2_find_include(GIO gio/gio.h)
+    _glib2_find_library(GIO gio)
+
+    _glib2_add_target(gio GIO GIO GMODULE GOBJECT GLIB GLIBCONFIG)
+
+  elseif(_glib2_component STREQUAL "gmodule")
+
+    _glib2_find_include(GMODULE gmodule.h)
+    _glib2_find_library(GMODULE gmodule)
+
+    _glib2_add_target(gmodule GMODULE GMODULE GLIB GLIBCONFIG)
+
+  elseif(_glib2_component STREQUAL "gobject")
+
+    _glib2_find_include(GOBJECT glib-object.h)
+    _glib2_find_library(GOBJECT gobject)
+
+    _glib2_add_target(gobject GOBJECT GOBJECT GLIB GLIBCONFIG)
+
+  elseif(_glib2_component STREQUAL "gthread")
+
+    _glib2_find_library(GTHREAD gthread)
+
+    _glib2_add_target(gthread GTHREAD GLIB GLIBCONFIG)
+
+  endif()
+
+endforeach()
+
+list(APPEND GLib2_FIND_COMPONENTS glib)
+set(GLib2_FIND_REQUIRED_glib TRUE)
+
+find_package_handle_standard_args(GLib2
+  REQUIRED_VARS GLIB2_GLIB_LIBRARY
+  HANDLE_COMPONENTS
+)

lcm-logger/CMakeLists.txt

@@ -1,16 +1,8 @@
 add_executable(lcm-logger lcm_logger.c glib_util.c)
-target_link_libraries(lcm-logger
-  lcm
-  ${GLIB_LDFLAGS}
-)
-target_include_directories(lcm-logger PRIVATE ${GLIB_INCLUDE_DIRS})
+target_link_libraries(lcm-logger lcm GLib2::glib)
 
 add_executable(lcm-logplayer lcm_logplayer.c)
-target_link_libraries(lcm-logplayer
-  lcm
-  ${GLIB_LDFLAGS}
-)
-target_include_directories(lcm-logplayer PRIVATE ${GLIB_INCLUDE_DIRS})
+target_link_libraries(lcm-logplayer lcm GLib2::glib)
 
 install(TARGETS
   lcm-logger

lcm/CMakeLists.txt

@@ -60,10 +60,8 @@ foreach(lcm_lib lcm lcm-static)
     $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
   )
 
-  target_include_directories(${lcm_lib} PRIVATE ${GLIB_INCLUDE_DIRS})
-
   target_link_libraries(${lcm_lib} PRIVATE
-    ${GLIB_LDFLAGS}
+    GLib2::glib
     ${CMAKE_THREAD_LIBS_INIT}
   )
 

lcmgen/CMakeLists.txt

@@ -43,8 +43,7 @@ if(_uses_sanitizers AND NOT LCM_SANITIZE_LCMGEN)
 endif()
 
 add_executable(lcm-gen ${lcm-gen_sources})
-target_link_libraries(lcm-gen PRIVATE ${GLIB_LDFLAGS})
-target_include_directories(lcm-gen PRIVATE ${GLIB_INCLUDE_DIRS})
+target_link_libraries(lcm-gen PRIVATE GLib2::glib)
 
 install(TARGETS lcm-gen
   EXPORT lcmTargets

liblcm-test/CMakeLists.txt

@@ -5,8 +5,7 @@ add_executable(lcm-source lcm-source.c)
 target_link_libraries(lcm-source lcm)
 
 add_executable(lcm-tester lcm-tester.c)
-target_link_libraries(lcm-tester lcm ${GLIB_LDFLAGS})
-target_include_directories(lcm-tester PRIVATE ${GLIB_INCLUDE_DIRS})
+target_link_libraries(lcm-tester lcm GLib2::glib)
 if(WIN32)
   target_link_libraries(lcm-tester wsock32 ws2_32)
 endif()
@@ -18,16 +17,13 @@ if(WIN32)
 endif()
 
 add_executable(lcm-logfilter lcm-logfilter.c)
-target_link_libraries(lcm-logfilter lcm ${GLIB_LDFLAGS})
-target_include_directories(lcm-logfilter PRIVATE ${GLIB_INCLUDE_DIRS})
+target_link_libraries(lcm-logfilter lcm GLib2::glib)
 
 add_executable(lcm-buftest-receiver buftest-receiver.c)
-target_link_libraries(lcm-buftest-receiver lcm ${GLIB_LDFLAGS})
-target_include_directories(lcm-buftest-receiver PRIVATE ${GLIB_INCLUDE_DIRS})
+target_link_libraries(lcm-buftest-receiver lcm GLib2::glib)
 
 add_executable(lcm-buftest-sender buftest-sender.c)
-target_link_libraries(lcm-buftest-sender lcm ${GLIB_LDFLAGS})
-target_include_directories(lcm-buftest-sender PRIVATE ${GLIB_INCLUDE_DIRS})
+target_link_libraries(lcm-buftest-sender lcm GLib2::glib)
 
 install(TARGETS
   lcm-sink

test/c/CMakeLists.txt

@@ -10,8 +10,7 @@ add_executable(test-c-memq_test memq_test.cpp common.c)
 target_link_libraries(test-c-memq_test ${test_c_libs})
 
 add_executable(test-c-eventlog_test eventlog_test.cpp common.c)
-target_link_libraries(test-c-eventlog_test ${GLIB_LDFLAGS} ${test_c_libs})
-target_include_directories(test-c-eventlog_test PRIVATE ${GLIB_INCLUDE_DIRS})
+target_link_libraries(test-c-eventlog_test GLib2::glib ${test_c_libs})
 
 add_executable(test-c-udpm_test udpm_test.cpp common.c)
 target_link_libraries(test-c-udpm_test ${test_c_libs})