cmake: Set GMT_BUILD_DATE to the current date or the last commit date (…

…#8501)

cmake/modules/ConfigCMake.cmake

@@ -59,9 +59,6 @@ endif (NOT CMAKE_BUILD_TYPE)
 # Here we change it to add the git commit hash for non-public releases
 set (GMT_PACKAGE_VERSION_WITH_GIT_REVISION ${GMT_PACKAGE_VERSION})
 
-# ...
-set (GMT_BUILD_DATE ${GMT_BUILD_DATE})
-
 # Check if it's a git repository or not
 if (EXISTS ${GMT_SOURCE_DIR}/.git)
  set (HAVE_GIT_VERSION TRUE)
@@ -95,11 +92,15 @@ if (GIT_FOUND AND HAVE_GIT_VERSION AND NOT GMT_PUBLIC_RELEASE)
  endif (GIT_RETURN_CODE)
 endif (GIT_FOUND AND HAVE_GIT_VERSION AND NOT GMT_PUBLIC_RELEASE)
 
-execute_process (COMMAND ${GIT_EXECUTABLE} log -1 --date=short --pretty=format:%cd
- WORKING_DIRECTORY ${GMT_SOURCE_DIR}
- OUTPUT_VARIABLE GMT_BUILD_DATE
- OUTPUT_STRIP_TRAILING_WHITESPACE)
-string(REPLACE "-" "." GMT_BUILD_DATE "${GMT_BUILD_DATE}")
+# Set the GMT building date
+string(TIMESTAMP GMT_BUILD_DATE "%Y.%m.%d" UTC) # Default to current year.
+if (HAVE_GIT_VERSION)
+ execute_process (COMMAND ${GIT_EXECUTABLE} log -1 --date=short --pretty=format:%cd
+ WORKING_DIRECTORY ${GMT_SOURCE_DIR}
+ OUTPUT_VARIABLE GMT_BUILD_DATE
+ OUTPUT_STRIP_TRAILING_WHITESPACE)
+ string(REPLACE "-" "." GMT_BUILD_DATE "${GMT_BUILD_DATE}")
+endif (HAVE_GIT_VERSION)
 
 # apply license restrictions
 if (LICENSE_RESTRICTED) # on