Add an option to compile the build date into dindexer's binary

CMakeLists.txt

@@ -19,6 +19,7 @@ include(GetGitRevisionDescription)
 include(Buildlibpqtypes)
 include(gccversion)
 include(CPack)
+include(timestamp)
 
 option(DINDEXER_DEBUG_CFG_FILE "Enable to set the config file path to the build path" OFF)
 option(DINDEXER_WITH_MEDIA_AUTODETECT "Enable code that tries to autodetect the media type and sets --type automatically" ON)

cmake/Modules/timestamp.cmake

@@ -0,0 +1,40 @@
+if (NOT bare_name)
+	message(FATAL_ERROR "bare_name variable not defined")
+endif()
+
+string(TOUPPER "${bare_name}" bare_name_upper)
+
+option(${bare_name_upper}_WITH_BUILD_DATE "Compile the build date into the program. It will cause frequent rebuilds" OFF)
+string(TOUPPER ${${bare_name_upper}_WITH_BUILD_DATE} ${bare_name_upper}_WITH_BUILD_DATE PARENT_SCOPE)
+
+#See:
+#http://stackoverflow.com/questions/24292898/compile-date-and-time-using-cmake#26214363
+function (make_timestamp project_name file_input)
+#	if (${bare_name_upper}_WITH_BUILD_DATE)
+#		string(TIMESTAMP ${bare_name_upper}_BUILD_DATE "%Y-%m-%d %H:%M:%S" UTC)
+#	else()
+#		set(${bare_name_upper}_BUILD_DATE "")
+#	endif()
+	get_filename_component(file_name "${file_input}" NAME)
+	string(REGEX REPLACE "\\.in$" "" file_name "${file_name}")
+
+	FILE (WRITE ${CMAKE_CURRENT_BINARY_DIR}/timestamp.cmake
+"if (${bare_name_upper}_WITH_BUILD_DATE)
+#	string(TIMESTAMP ${bare_name_upper}_BUILD_DATE \"%Y-%m-%d %H:%M:%S\" UTC)
+	string(TIMESTAMP ${bare_name_upper}_BUILD_DATE \"%Y-%m-%d %H:%M:%S\" UTC)
+else()
+	set(${bare_name_upper}_BUILD_DATE \"\")
+endif()
+#set(${bare_name_upper}_BUILD_DATE \"$\{${bare_name_upper}_BUILD_DATE}\" PARENT_SCOPE)
+configure_file(\"${CMAKE_CURRENT_SOURCE_DIR}/${file_input}\" \"${CMAKE_CURRENT_BINARY_DIR}/${file_name}\")\n"
+	)
+
+	add_custom_target (
+		timestamp
+		COMMAND ${CMAKE_COMMAND} "-D${bare_name_upper}_WITH_BUILD_DATE=${${bare_name_upper}_WITH_BUILD_DATE}" -P ${CMAKE_CURRENT_BINARY_DIR}/timestamp.cmake
+		ADD_DEPENDENCIES ${CMAKE_CURRENT_BINARY_DIR}/timestamp.cmake
+	)
+
+	add_dependencies(${project_name} timestamp)
+	#set_source_files_properties("${PROJECT_BINARY_DIR}/${bare_name}Config.h" OBJECT_DEPENDS timestamp)
+endfunction()

drone_configuration

@@ -17,6 +17,6 @@ sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 60 --slave /u
 echo 3 | sudo update-alternatives --config gcc
 mkdir dindexer_build
 cd dindexer_build
-cmake -DCMAKE_BUILD_TYPE=Release ../dindexer
+cmake -DCMAKE_BUILD_TYPE=Release -DDINDEXER_WITH_BUILD_DATE=on ../dindexer
 make
 make package

src/main/CMakeLists.txt

@@ -10,9 +10,11 @@ add_executable(${PROJECT_NAME}
 	utf8_ops.c
 )
 
+make_timestamp(${bare_name} timestamp.h.in)
 target_include_directories(${PROJECT_NAME}
 	PRIVATE ${CMAKE_SOURCE_DIR}/include
 	PRIVATE ${CMAKE_SOURCE_DIR}/lib/pbl/pbl/src/src
+	PRIVATE ${CMAKE_CURRENT_BINARY_DIR}
 )
 
 target_link_libraries(${PROJECT_NAME}

src/main/builtin_feats.c

@@ -18,6 +18,7 @@
 #include "builtin_feats.h"
 #include <stdio.h>
 #include "dindexerConfig.h"
+#include "timestamp.h"
 
 void print_builtin_feats() {
 	print_version();
@@ -42,6 +43,9 @@ void print_builtin_feats() {
 	printf("  %s %s\n", CMAKE_CXX_COMPILER, CMAKE_CXX_FLAGS);
 	printf("  %s %s\n", CMAKE_C_COMPILER, CMAKE_C_FLAGS);
 	printf("DB_OWNER_NAME = \"%s\"\n", DB_OWNER_NAME);
+#if defined(DINDEXER_BUILD_DATE)
+	printf("BUILD_DATE = %s\n", DINDEXER_BUILD_DATE);
+#endif
 }
 
 void print_version() {

src/main/timestamp.h.in

@@ -0,0 +1,32 @@
+/* Copyright 2015, 2016, Michele Santullo
+ * This file is part of "dindexer".
+ *
+ * "dindexer" is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * "dindexer" is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with "dindexer".  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef id4A9E94ACFA43498097637025A5BA69E5
+#define id4A9E94ACFA43498097637025A5BA69E5
+
+#if !defined(CMAKE_ON)
+#	define CMAKE_ON 1
+#endif
+#if !defined(CMAKE_OFF)
+#	define CMAKE_OFF 0
+#endif
+
+#if CMAKE_@DINDEXER_WITH_BUILD_DATE@
+#	define DINDEXER_BUILD_DATE "@DINDEXER_BUILD_DATE@"
+#endif
+
+#endif