[cmake] Make CMake aware of textfiles that configure the build

The CMake based buildsystem is based on reading the input of textfiles
at configure-time. As CMake does not track files that are just accessed
using "file(READ)" building does not automatically retrigger a
reconfiguration when those files are changes. This commit fixes it by
either using configure_file or using the CMAKE_CONFIGURE_DEPENDS
variable.

This should remove the necessity to manually rerun CMake when files are
changed during development. (Due to globbing CMake still has to be
rerun when files are added or removed!)

project/cmake/scripts/common/AddonHelpers.cmake

@@ -56,6 +56,7 @@ macro (build_addon target prefix libs)
 
   # if there's an addon.xml.in we need to generate the addon.xml
   IF(EXISTS ${PROJECT_SOURCE_DIR}/${target}/addon.xml.in)
+    set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${PROJECT_SOURCE_DIR}/${target}/addon.xml.in)
     SET(PLATFORM ${CORE_SYSTEM_NAME})
 
     FILE(READ ${PROJECT_SOURCE_DIR}/${target}/addon.xml.in addon_file)

project/cmake/scripts/common/HandleDepends.cmake

@@ -10,6 +10,7 @@ function(add_addon_depends addon searchpath)
   list(APPEND cmake_input_files ${cmake_input_files2})
 
   foreach(file ${cmake_input_files})
+    set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${file})
     if(NOT (file MATCHES CMakeLists.txt OR
             file MATCHES install.txt OR
             file MATCHES noinstall.txt OR
@@ -45,6 +46,7 @@ function(add_addon_depends addon searchpath)
 
         # check if there are any library specific flags that need to be passed on
         if(EXISTS ${dir}/flags.txt)
+          set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${dir}/flags.txt)
           file(STRINGS ${dir}/flags.txt extraflags)
           separate_arguments(extraflags)
           message(STATUS "${id} extraflags: ${extraflags}")
@@ -77,9 +79,10 @@ function(add_addon_depends addon searchpath)
         # if there's a CMakeLists.txt use it to prepare the build
         set(PATCH_FILE ${BUILD_DIR}/${id}/tmp/patch.cmake)
         if(EXISTS ${dir}/CMakeLists.txt)
+          set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${dir}/CMakeLists.txt)
           file(APPEND ${PATCH_FILE}
                "file(COPY ${dir}/CMakeLists.txt
-                   DESTINATION ${BUILD_DIR}/${id}/src/${id})\n")
+                     DESTINATION ${BUILD_DIR}/${id}/src/${id})\n")
         endif()
 
         # check if we have patches to apply
@@ -104,6 +107,7 @@ function(add_addon_depends addon searchpath)
             endif()
           endif()
 
+          set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${patch})
           file(APPEND ${PATCH_FILE}
                "execute_process(COMMAND ${PATCH_PROGRAM} -p1 -i \"${patch}\")\n")
         endforeach()
@@ -125,6 +129,7 @@ function(add_addon_depends addon searchpath)
 
         # check if there's a deps.txt containing dependencies on other libraries
         if(EXISTS ${dir}/deps.txt)
+          set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${dir}/deps.txt)
           file(STRINGS ${dir}/deps.txt deps)
           message(STATUS "${id} depends: ${deps}")
         else()
@@ -133,6 +138,7 @@ function(add_addon_depends addon searchpath)
 
         if(CROSS_AUTOCONF AND AUTOCONF_FILES)
           foreach(afile ${AUTOCONF_FILES})
+            set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${afile})
             file(APPEND ${PATCH_FILE}
                  "message(STATUS \"AUTOCONF: copying ${afile} to ${BUILD_DIR}/${id}/src/${id}\")\n
                  file(COPY ${afile} DESTINATION ${BUILD_DIR}/${id}/src/${id})\n")

project/cmake/scripts/common/Macros.cmake

@@ -235,6 +235,7 @@ function(core_file_read_filtered result filepattern)
     if(VERBOSE)
       message(STATUS "core_file_read_filtered - filename: ${filename}")
     endif()
+    set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${filename})
     file(STRINGS ${filename} fstrings REGEX "^[^#//]")
     foreach(fstring ${fstrings})
       string(REGEX REPLACE "^(.*)#(.*)" "\\1" fstring ${fstring})
@@ -293,6 +294,7 @@ macro(core_add_optional_subdirs_from_filelist pattern)
     if(VERBOSE)
       message(STATUS "core_add_optional_subdirs_from_filelist - reading file: ${filename}")
     endif()
+    set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${filename})
     file(STRINGS ${filename} fstrings REGEX "^[^#//]")
     foreach(line ${fstrings})
       string(REPLACE " " ";" line "${line}")