[Git][reproducible-builds/reproducible-website][master] Add configure.ac / GNU Autotools example for using SOURCE_DATE_EPOCH.

[Chris Lamb (@lamby)]

Chris Lamb pushed to branch master at Reproducible Builds / reproducible-website


Commits:
54b010d0 by Chris Lamb at 2025-04-29T14:09:36-07:00
Add configure.ac / GNU Autotools example for using SOURCE_DATE_EPOCH.

- - - - -


1 changed file:

- _docs/source-date-epoch.md


Changes:

=====================================
_docs/source-date-epoch.md
=====================================
@@ -99,6 +99,24 @@ endif
 
 The above will work with either GNU or BSD date, and fallback to ignore `SOURCE_DATE_EPOCH` if both fails.
 
+### GNU Autotools / `configure.ac`
+
+```make
+BUILD_DATE=m4_esyscmd([date --utc --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" %Y-%m-%d])
+AC_SUBST(BUILD_DATE)
+```
+
+or:
+
+```make
+DATE_FMT="%Y-%m-%d"
+BUILD_DATE=`date $DATE_FMT`
+if test "x$SOURCE_DATE_EPOCH" != "x"; then
+    BUILD_DATE=`date -u -d "@$SOURCE_DATE_EPOCH" $DATE_FMT 2>/dev/null || date -u -r $SOURCE_DATE_EPOCH $DATE_FMT || date -u $DATE_FMT`
+fi
+AC_SUBST(BUILD_DATE)
+```
+
 ### CMake
 
 ```cmake



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