From 969496f15e1e0359e26c2c6e995ad4ef82720f86 Mon Sep 17 00:00:00 2001
From: Manuel Bentele
Date: Fri, 16 Oct 2020 17:15:49 +0200
Subject: [BUILD] rewrite CMake build system to track changes of source files

This change restructures the source code directories, separates shared
form non-shared application code and adds CMake dependencies. These
dependencies allow the tracking of changes and trigger a rebuild of
those build targets where changed files are involved.

WARNING: Note that the support of the DNBD3_SERVER_AFL build option is
not supported yet. Thus, the option should be never turned on.
---
 cmake/ProjectVersion.cmake | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 cmake/ProjectVersion.cmake

(limited to 'cmake/ProjectVersion.cmake')

diff --git a/cmake/ProjectVersion.cmake b/cmake/ProjectVersion.cmake
new file mode 100644
index 0000000..108505d
--- /dev/null
+++ b/cmake/ProjectVersion.cmake
@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (C) 2020 Manuel Bentele <development@manuel-bentele.de>
+#
+
+macro(gen_project_version VERSION_INPUT_FILE VERSION_OUTPUT_FILE)
+    get_filename_component(VERSION_OUTPUT_FILENAME ${VERSION_OUTPUT_FILE} NAME)
+    # command that will trigger a rebuild of version.c every time
+    add_custom_command(OUTPUT regenerate-version-file
+                       COMMAND ${CMAKE_COMMAND} -E sleep 0
+                       COMMENT "Trigger generating ${VERSION_OUTPUT_FILENAME}")
+
+    # call the GenerateVersion.cmake file to generate the version.c file
+    add_custom_command(OUTPUT ${VERSION_OUTPUT_FILE}
+                       COMMAND ${CMAKE_COMMAND} -D VERSION_INPUT_FILE=${VERSION_INPUT_FILE}
+                                                -D VERSION_OUTPUT_FILE=${VERSION_OUTPUT_FILE}
+                                                -P ${PROJECT_MODULES_DIR}/GenerateVersion.cmake
+                       COMMENT "Generating ${VERSION_OUTPUT_FILENAME}"
+                       DEPENDS regenerate-version-file)
+    add_custom_target(dnbd3-generate-version DEPENDS ${VERSION_OUTPUT_FILE})
+
+    # create target to expose project version
+    add_library(dnbd3-version INTERFACE)
+    target_include_directories(dnbd3-version INTERFACE ${PROJECT_INCLUDE_TMP_DIR})
+    add_dependencies(dnbd3-version dnbd3-generate-version)
+
+endmacro(gen_project_version VERSION_INPUT_FILE VERSION_OUTPUT_FILE)
-- 
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