From 8394366238782405bf05ed20c75a35feb4f52058 Mon Sep 17 00:00:00 2001
From: Jason Felds <jafelds@gmail.com>
Date: Mon, 25 May 2015 12:43:22 -0400
Subject: [PATCH] Prepare timestamp macros.

---
 CMake/SMDefs.cmake | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/CMake/SMDefs.cmake b/CMake/SMDefs.cmake
index 8cc6951f7a..4d565259d7 100644
--- a/CMake/SMDefs.cmake
+++ b/CMake/SMDefs.cmake
@@ -18,3 +18,48 @@ else()
   set(SM_VERSION_FULL "${SM_VERSION_MAJOR}.${SM_VERSION_MINOR}-git-${SM_VERSION_GIT_HASH}")
 endif()
 
+if (CMAKE_MAJOR_VERSION STREQUAL "3")
+  # Use the CMake 3 approach whenever possible.
+  string(TIMESTAMP SM_TIMESTAMP_DATE "%Y%m%d")
+  string(TIMESTAMP SM_TIMESTAMP_TIME "%H:%M:%S" UTC)
+else()
+  if(MSVC)
+    message(STATUS "Getting date and time information via PowerShell. This may take a few seconds.")
+    execute_process(
+      COMMAND powershell get-date -format "{yyyyMMdd}"
+      OUTPUT_VARIABLE SM_TIMESTAMP_DATE
+      RESULT_VARIABLE ret
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+
+    execute_process(
+      COMMAND powershell get-date -format "{HH:mm:ss zzz}"
+      OUTPUT_VARIABLE SM_TIMESTAMP_TIME
+      RESULT_VARIABLE ret
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+  else()
+    execute_process(
+      COMMAND date "+\"%Y%m%d\""
+      OUTPUT_VARIABLE SM_TIMESTAMP_DATE
+      RESULT_VARIABLE ret
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+
+    execute_process(
+      COMMAND date "+\"%H:%M:%S %z"
+      OUTPUT_VARIABLE SM_TIMESTAMP_TIME
+      RESULT_VARIABLE ret
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+  endif()
+
+  if (NOT (ret STREQUAL "0"))
+    set(SM_TIMESTAMP_DATE "xxxxyyzz")
+  endif()
+
+  if (NOT (ret STREQUAL "0"))
+    set(SM_TIMESTAMP_TIME "xx:yy:zz ???")
+  endif()
+endif()
+