From a8e85bd146cd38d43846d9e27acd9ec1075e169b Mon Sep 17 00:00:00 2001
From: Yuri D'Elia <wavexx@thregr.org>
Date: Sat, 1 Oct 2022 22:44:51 +0200
Subject: [PATCH] cmake: Work-around gcc 7 not supporting SOURCE_DATE_EPOCH

---
 CMakeLists.txt           |  6 ++++++
 Firmware/Configuration.h | 11 ++++++++---
 Firmware/ultralcd.cpp    |  2 +-
 3 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3d2ff87db..5134de875 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -240,6 +240,12 @@ if(CMAKE_CROSSCOMPILING)
 
     # TODO: get date from the last git commit to set as epoch
     set(ENV{SOURCE_DATE_EPOCH} 0)
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "8")
+        string(TIMESTAMP SOURCE_DATE_EPOCH "%Y-%m-%d")
+        add_compile_definitions(SOURCE_DATE_EPOCH="${SOURCE_DATE_EPOCH}")
+        string(TIMESTAMP SOURCE_TIME_EPOCH "%H:%M:%S")
+        add_compile_definitions(SOURCE_TIME_EPOCH="${SOURCE_TIME_EPOCH}")
+    endif()
 
     # default optimization flags
     set(CMAKE_CXX_FLAGS_DEBUG "-Og -g")
diff --git a/Firmware/Configuration.h b/Firmware/Configuration.h
index af36b3616..454ccbc10 100644
--- a/Firmware/Configuration.h
+++ b/Firmware/Configuration.h
@@ -63,6 +63,13 @@ extern PGM_P sPrinterName;
 #undef DEBUG_BUILD
 #endif
 
+#ifndef SOURCE_DATE_EPOCH
+#define SOURCE_DATE_EPOCH __DATE__
+#endif
+#ifndef SOURCE_TIME_EPOCH
+#define SOURCE_TIME_EPOCH __TIME__
+#endif
+
 #include "Configuration_prusa.h"
 
 #define FW_PRUSA3D_MAGIC "PRUSA3DFW"
@@ -78,9 +85,7 @@ extern PGM_P sPrinterName;
 // startup. Implementation of an idea by Prof Braino to inform user that any changes made to this
 // build by the user have been successfully uploaded into firmware.
 
-//#define STRING_VERSION "1.0.2"
-
-#define STRING_VERSION_CONFIG_H __DATE__ " " __TIME__ // build date and time
+#define STRING_VERSION_CONFIG_H SOURCE_DATE_EPOCH " " SOURCE_TIME_EPOCH // build date and time
 #define STRING_CONFIG_H_AUTHOR "(none, default config)" // Who made the changes.
 
 // SERIAL_PORT selects which serial port should be used for communication with the host.
diff --git a/Firmware/ultralcd.cpp b/Firmware/ultralcd.cpp
index 8a8bf7fa5..74bee7ad4 100644
--- a/Firmware/ultralcd.cpp
+++ b/Firmware/ultralcd.cpp
@@ -1657,7 +1657,7 @@ static void lcd_support_menu()
   MENU_ITEM_BACK_P(PSTR(NOZZLE_TYPE));
   MENU_ITEM_BACK_P(STR_SEPARATOR);
   MENU_ITEM_BACK_P(_i("Date:"));////MSG_DATE c=17
-  MENU_ITEM_BACK_P(PSTR(__DATE__));
+  MENU_ITEM_BACK_P(PSTR(SOURCE_DATE_EPOCH));
 
 #if defined(FILAMENT_SENSOR) && (FILAMENT_SENSOR_TYPE == FSENSOR_IR_ANALOG)
   MENU_ITEM_BACK_P(STR_SEPARATOR);