Merge topic 'FindSQLite3-pkg-config' into release-3.31

2d228201 Help: Guard calls to pkg_check_modules in cmake-developer(7) example
674a9878 FindSQLite3: Guard calls to pkg_check_modules

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !9983

Help/manual/cmake-developer.7.rst

@@ -408,7 +408,9 @@ starting point.
 .. code-block:: cmake
 
   find_package(PkgConfig)
-  pkg_check_modules(PC_Foo QUIET Foo)
+  if(PKG_CONFIG_FOUND)
+    pkg_check_modules(PC_Foo QUIET Foo)
+  endif()
 
 This should define some variables starting ``PC_Foo_`` that contain the
 information from the ``Foo.pc`` file.

Modules/FindSQLite3.cmake

@@ -36,7 +36,9 @@ cmake_policy(PUSH)
 cmake_policy(SET CMP0159 NEW) # file(STRINGS) with REGEX updates CMAKE_MATCH_<n>
 
 find_package(PkgConfig QUIET)
-pkg_check_modules(PC_SQLite3 QUIET sqlite3)
+if(PKG_CONFIG_FOUND)
+  pkg_check_modules(PC_SQLite3 QUIET sqlite3)
+endif()
 
 # Look for the necessary header
 find_path(SQLite3_INCLUDE_DIR NAMES sqlite3.h