-add QUIET keyword to pkgconfig macros

Synced from KDE svn: pkg_check_modules() and pkg_search_module() now
both support a QUIET keyword. When given, no messages will be printed (except the REQUIRED ones)

This also fixes #10469 (confusing output of FindLibXml2.cmake)

Alex

Modules/FindLibXml2.cmake

@@ -24,7 +24,7 @@
 # use pkg-config to get the directories and then use these values
 # in the FIND_PATH() and FIND_LIBRARY() calls
 FIND_PACKAGE(PkgConfig)
-PKG_CHECK_MODULES(PC_LIBXML libxml-2.0)
+PKG_CHECK_MODULES(PC_LIBXML libxml-2.0 QUIET)
 SET(LIBXML2_DEFINITIONS ${PC_LIBXML_CFLAGS_OTHER})
 
 FIND_PATH(LIBXML2_INCLUDE_DIR NAMES libxml/xpath.h

Modules/FindPkgConfig.cmake

@@ -1,15 +1,17 @@
 # - a pkg-config module for CMake
 #
 # Usage:
-#   pkg_check_modules(<PREFIX> [REQUIRED] <MODULE> [<MODULE>]*)
+#   pkg_check_modules(<PREFIX> [REQUIRED] [QUIET] <MODULE> [<MODULE>]*)
 #     checks for all the given modules
 #
-#   pkg_search_module(<PREFIX> [REQUIRED] <MODULE> [<MODULE>]*)
+#   pkg_search_module(<PREFIX> [REQUIRED] [QUIET] <MODULE> [<MODULE>]*)
 #     checks for given modules and uses the first working one
 #
 # When the 'REQUIRED' argument was set, macros will fail with an error
 # when module(s) could not be found
 #
+# When the 'QUIET' argument is set, no status messages will be printed.
+#
 # It sets the following variables:
 #   PKG_CONFIG_FOUND         ... true if pkg-config works on the system
 #   PKG_CONFIG_EXECUTABLE    ... pathname of the pkg-config program
@@ -138,17 +140,22 @@ macro(_pkgconfig_invoke_dyn _pkglist _prefix _varname cleanup_regexp)
 endmacro(_pkgconfig_invoke_dyn)
 
 # Splits given arguments into options and a package list
-macro(_pkgconfig_parse_options _result _is_req)
+macro(_pkgconfig_parse_options _result _is_req _is_silent)
   set(${_is_req} 0)
+  set(${_is_silent} 0)
   
   foreach(_pkg ${ARGN})
     if (_pkg STREQUAL "REQUIRED")
       set(${_is_req} 1)
     endif (_pkg STREQUAL "REQUIRED")
+    if (_pkg STREQUAL "QUIET")
+      set(${_is_silent} 1)
+    endif (_pkg STREQUAL "QUIET")
   endforeach(_pkg ${ARGN})
 
   set(${_result} ${ARGN})
   list(REMOVE_ITEM ${_result} "REQUIRED")
+  list(REMOVE_ITEM ${_result} "QUIET")
 endmacro(_pkgconfig_parse_options)
 
 ###
@@ -279,7 +286,9 @@ macro(_pkg_check_modules_internal _is_required _is_silent _prefix)
         _pkgconfig_invoke(${_pkg_check_modules_pkg} "${_pkg_check_prefix}" INCLUDEDIR ""   --variable=includedir )
         _pkgconfig_invoke(${_pkg_check_modules_pkg} "${_pkg_check_prefix}" LIBDIR     ""   --variable=libdir )
 
-        message(STATUS "  found ${_pkg_check_modules_pkg}, version ${_pkgconfig_VERSION}")
+        if (NOT ${_is_silent})
+          message(STATUS "  found ${_pkg_check_modules_pkg}, version ${_pkgconfig_VERSION}")
+        endif (NOT ${_is_silent})
       endforeach(_pkg_check_modules_pkg)
 
       # set variables which are combined for multiple modules
@@ -307,8 +316,8 @@ endmacro(_pkg_check_modules_internal)
 macro(pkg_check_modules _prefix _module0)
   # check cached value
   if (NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
-    _pkgconfig_parse_options   (_pkg_modules _pkg_is_required "${_module0}" ${ARGN})
-    _pkg_check_modules_internal("${_pkg_is_required}" 0 "${_prefix}" ${_pkg_modules})
+    _pkgconfig_parse_options   (_pkg_modules _pkg_is_required _pkg_is_silent "${_module0}" ${ARGN})
+    _pkg_check_modules_internal("${_pkg_is_required}" "${_pkg_is_silent}" "${_prefix}" ${_pkg_modules})
 
     _pkgconfig_set(__pkg_config_checked_${_prefix} ${PKG_CONFIG_VERSION})
   endif(NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
@@ -319,9 +328,11 @@ macro(pkg_search_module _prefix _module0)
   # check cached value
   if (NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
     set(_pkg_modules_found 0)
-    _pkgconfig_parse_options(_pkg_modules_alt _pkg_is_required "${_module0}" ${ARGN})
+    _pkgconfig_parse_options(_pkg_modules_alt _pkg_is_required _pkg_is_silent "${_module0}" ${ARGN})
 
-    message(STATUS "checking for one of the modules '${_pkg_modules_alt}'")
+    if (NOT ${_pkg_is_silent})
+      message(STATUS "checking for one of the modules '${_pkg_modules_alt}'")
+    endif (NOT ${_pkg_is_silent})
 
     # iterate through all modules and stop at the first working one.
     foreach(_pkg_alt ${_pkg_modules_alt})