[FIX] Fix Mac build error for reproducible builds (#1232)

* Fix Mac build error for reproducible builds
* Shorten solution with vr8hub's suggestion

Closes #1230

docs/CHANGES.TXT

@@ -17,6 +17,7 @@
 - Fix: A few (minor) memory leaks around the code.
 - Fix: General code clean up / reformatting
 - Fix: Fix multiple definitions with new -fno-common default in GCC 10
+- Fix: Mac now builds reproducibly again without errors on the date command (#1230)
 - Doc: Updated ccextractor.cnf.sample.
 
 0.88 (2019-05-21)

mac/pre-build.sh

@@ -21,7 +21,7 @@ fi
 if [ -z "$commit" ]; then
 	commit="Unknown"
 fi
-builddate=`date --utc --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%Y-%m-%d`
+builddate=`date -j -u -r "${SOURCE_DATE_EPOCH:-$(date +%s)}" +%Y-%m-%d`
 echo "Storing variables in file"
 echo "Commit: $commit"
 echo "Date: $builddate"