Merge topic 'pr.projectbefore'

0761186949 project: Add variable CMAKE_PROJECT_INCLUDE_BEFORE

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !3175

Help/command/project.rst

@@ -31,6 +31,10 @@ Further variables are set by the optional arguments described in the following.
 If any of these arguments is not used, then the corresponding variables are
 set to the empty string.
 
+If the variable :variable:`CMAKE_PROJECT_INCLUDE_BEFORE` exists, the file
+pointed to by that variable will be included as the first step of the project
+command.
+
 If the variable :variable:`CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE`
 or :variable:`CMAKE_PROJECT_INCLUDE` exists, the file pointed to by that
 variable will be included as the last step of the project command.

Help/manual/cmake-variables.7.rst

@@ -196,6 +196,7 @@ Variables that Change Behavior
    /variable/CMAKE_PREFIX_PATH
    /variable/CMAKE_PROGRAM_PATH
    /variable/CMAKE_PROJECT_INCLUDE
+   /variable/CMAKE_PROJECT_INCLUDE_BEFORE
    /variable/CMAKE_PROJECT_PROJECT-NAME_INCLUDE
    /variable/CMAKE_SKIP_INSTALL_ALL_DEPENDENCY
    /variable/CMAKE_STAGING_PREFIX

Help/release/dev/project-include-before.rst

@@ -0,0 +1,5 @@
+cmake_project_include_before
+----------------------------
+
+* A variable :variable:`CMAKE_PROJECT_INCLUDE_BEFORE` was added to allow
+  injection of custom code into the project.

Help/variable/CMAKE_PROJECT_INCLUDE_BEFORE.rst

@@ -0,0 +1,6 @@
+CMAKE_PROJECT_INCLUDE_BEFORE
+----------------------------
+
+A CMake language file or module to be included before processing the
+:command:`project` command. This is intended for injecting custom code into
+project builds without modifying their source.