Split the find_dependency macro into a separate file.

This allows Config file authors to use it without having to use
CONFIGURE_PACKAGE_CONFIG_FILE.

2 files changed, 62 insertions, 31 deletions

diff --git a/Modules/CMakeFindDependencyMacro.cmake b/Modules/CMakeFindDependencyMacro.cmake
new file mode 100644
index 0000000..596c6fc
--- /dev/null
+++ b/Modules/CMakeFindDependencyMacro.cmake
@@ -0,0 +1,58 @@
+#.rst:
+# CMakeFindDependencyMacro
+# -------------------------
+#
+# ::
+#
+#     find_dependency(<dep> [<version>])
+#
+#
+# ``find_dependency()`` wraps a :command:`find_package` call for a package
+# dependency. It is designed to be used in a <package>Config.cmake file, and it
+# forwards the correct parameters for EXACT, QUIET and REQUIRED which were
+# passed to the original :command:`find_package` call.  It also sets an
+# informative diagnostic message if the dependency could not be found.
+#
+
+#=============================================================================
+# Copyright 2013 Stephen Kelly <steveire@gmail.com>
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+macro(find_dependency dep)
+  if (NOT ${dep}_FOUND)
+    if (${ARGV1})
+      set(version ${ARGV1})
+    endif()
+    set(exact_arg)
+    if(${CMAKE_FIND_PACKAGE_NAME}_FIND_VERSION_EXACT)
+      set(exact_arg EXACT)
+    endif()
+    set(quiet_arg)
+    if(${CMAKE_FIND_PACKAGE_NAME}_FIND_QUIETLY)
+      set(quiet_arg QUIET)
+    endif()
+    set(required_arg)
+    if(${CMAKE_FIND_PACKAGE_NAME}_FIND_REQUIRED)
+      set(required_arg REQUIRED)
+    endif()
+
+    find_package(${dep} ${version} ${exact_arg} ${quiet_arg} ${required_arg})
+    if (NOT ${dep}_FOUND)
+      set(${CMAKE_FIND_PACKAGE_NAME}_NOT_FOUND_MESSAGE "${CMAKE_FIND_PACKAGE_NAME} could not be found because dependency ${dep} could not be found.")
+      set(${CMAKE_FIND_PACKAGE_NAME}_FOUND False)
+      return()
+    endif()
+    set(required_arg)
+    set(quiet_arg)
+    set(exact_arg)
+  endif()
+endmacro()
diff --git a/Modules/CMakePackageConfigHelpers.cmake b/Modules/CMakePackageConfigHelpers.cmake
index 855af9c..2c1c613 100644
--- a/Modules/CMakePackageConfigHelpers.cmake
+++ b/Modules/CMakePackageConfigHelpers.cmake
@@ -196,11 +196,13 @@
 include(CMakeParseArguments)
 
 include(WriteBasicConfigVersionFile)
+include(CMakeFindDependencyMacro)
 
 macro(WRITE_BASIC_PACKAGE_VERSION_FILE)
   write_basic_config_version_file(${ARGN})
 endmacro()
 
+set(cfpch_dir ${CMAKE_CURRENT_LIST_DIR})
 
 function(CONFIGURE_PACKAGE_CONFIG_FILE _inputFile _outputFile)
   set(options NO_SET_AND_CHECK_MACRO NO_CHECK_REQUIRED_COMPONENTS_MACRO NO_FIND_DEPENDENCY_MACRO)
@@ -290,37 +292,8 @@ endmacro()
   endif()
 
   if(NOT CCF_NO_FIND_DEPENDENCY_MACRO)
-    set(PACKAGE_INIT "${PACKAGE_INIT}
-macro(find_dependency dep)
-  if (NOT \${dep}_FOUND)
-    if (\${ARGV1})
-      set(version \${ARGV1})
-    endif()
-    set(exact_arg)
-    if(\${CMAKE_FIND_PACKAGE_NAME}_FIND_VERSION_EXACT)
-      set(exact_arg EXACT)
-    endif()
-    set(quiet_arg)
-    if(\${CMAKE_FIND_PACKAGE_NAME}_FIND_QUIETLY)
-      set(quiet_arg QUIET)
-    endif()
-    set(required_arg)
-    if(\${CMAKE_FIND_PACKAGE_NAME}_FIND_REQUIRED)
-      set(required_arg REQUIRED)
-    endif()
-
-    find_package(\${dep} \${version} \${exact_arg} \${quiet_arg} \${required_arg})
-    if (NOT \${dep}_FOUND)
-      set(\${CMAKE_FIND_PACKAGE_NAME}_NOT_FOUND_MESSAGE \"\${CMAKE_FIND_PACKAGE_NAME} could not be found because dependency \${dep} could not be found.\")
-      set(\${CMAKE_FIND_PACKAGE_NAME}_FOUND False)
-      return()
-    endif()
-    set(required_arg)
-    set(quiet_arg)
-    set(exact_arg)
-  endif()
-endmacro()
-")
+    file(READ "${cfpch_dir}/CMakeFindDependencyMacro.cmake" find_dependency_macro)
+    set(PACKAGE_INIT "${PACKAGE_INIT} ${find_dependency_macro}")
   endif()
 
   set(PACKAGE_INIT "${PACKAGE_INIT}