Output timelib version in the configuration log

Author: petk

cmake/ext/date/lib/CMakeLists.txt

@@ -15,7 +15,28 @@ add_subdirectory(lib)
 
 cmake_minimum_required(VERSION 3.25...3.31)
 
-project(timelib LANGUAGES C)
+# The timelib version.
+block(PROPAGATE timelib_VERSION)
+  set(
+    regex
+    "^[ \t]*#[ \t]*define[ \t]+TIMELIB_ASCII_VERSION[ \t]+\"([0-9.]+)([^\"]*)"
+  )
+  file(STRINGS timelib.h _ REGEX "${regex}")
+
+  if(CMAKE_VERSION VERSION_LESS 3.29)
+    string(REGEX MATCH "${regex}" _ "${_}")
+  endif()
+
+  set(timelib_VERSION "${CMAKE_MATCH_1}")
+
+  message(STATUS "Configuring timelib ${timelib_VERSION}")
+endblock()
+
+project(
+  timelib
+  LANGUAGES C
+  VERSION ${timelib_VERSION}
+)
 
 include(CheckIncludeFile)