Use cmake TIMESTAMP function
because it is not only platform independent
but also allows to override the build date
This helps to make tigervnc builds reproducible
See https://reproducible-builds.org/ for why this is good
Also adds UTC flag, to be independent of timezone.
Also changes JAVA_DATE format to ISO-8601 date format.
Requires cmake-2.8.11+ from 2013
diff --git a/java/CMakeLists.txt b/java/CMakeLists.txt
index 23137f7..da24dcf 100644
--- a/java/CMakeLists.txt
+++ b/java/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 2.8.11)
project(tigervnc-java Java)
if(NOT VERSION)
@@ -25,13 +25,10 @@
set(JAVA_TSA_URL NOTFOUND CACHE STRING "URL of Time Stamping Authority (TSA)")
if(NOT BUILD)
- execute_process(COMMAND "date" "+%Y%m%d" OUTPUT_VARIABLE BUILD)
+ STRING(TIMESTAMP BUILD "%Y%m%d" UTC)
endif()
-execute_process(COMMAND "date" "+%b %d %Y" OUTPUT_VARIABLE JAVA_DATE)
-execute_process(COMMAND "date" "+%H:%M:%S" OUTPUT_VARIABLE JAVA_TIME)
-string(REGEX REPLACE "\n" "" JAVA_DATE ${JAVA_DATE})
-string(REGEX REPLACE "\n" "" JAVA_TIME ${JAVA_TIME})
-string(REGEX REPLACE "\n" "" BUILD ${BUILD})
+STRING(TIMESTAMP JAVA_DATE "%Y-%m-%d" UTC)
+STRING(TIMESTAMP JAVA_TIME "%H:%M:%S" UTC)
set(JAVA_SOURCES "")
set(JAVA_CLASSES "")