1 files changed, 89 insertions, 0 deletions
diff --git a/debian/patches/upstream/Support-defining-compilation-date-in-SOURCE_DATE_EPOCH.patch b/debian/patches/upstream/Support-defining-compilation-date-in-SOURCE_DATE_EPOCH.patch
new file mode 100644
index 0000000..f26c02a
--- /dev/null
+++ b/debian/patches/upstream/Support-defining-compilation-date-in-SOURCE_DATE_EPOCH.patch
@@ -0,0 +1,89 @@
+From: James McCoy <jamessan@jamessan.com>
+Date: Thu, 28 Jan 2016 10:55:11 -0500
+Subject: Support defining compilation date in $SOURCE_DATE_EPOCH
+
+There is an ongoing effort[0] to make FOSS software reproducibly
+buildable.  In order to make Vim build reproducibly, it is necessary to
+allow defining the date/time that is part of VIM_VERSION_LONG as part of
+the build process.
+
+This commit enables that by adding support for the SOURCE_DATE_EPOCH
+spec[1].  When the $SOURCE_DATE_EPOCH environment variable is defined,
+it will be used to populate the BUILD_DATE preprocessor define.
+
+If BUILD_DATE is not defined, the existing behavior of relying on the
+preprocessor's __DATE__/__TIME__ symbols will be used.
+
+[0]: https://reproducible-builds.org/
+[1]: https://reproducible-builds.org/specs/source-date-epoch/
+---
+ src/config.h.in  |  3 +++
+ src/configure.ac | 10 ++++++++++
+ src/version.c    |  8 ++++++++
+ 3 files changed, 21 insertions(+)
+
+diff --git a/src/config.h.in b/src/config.h.in
+index d1aaf70..78cf319 100644
+--- a/src/config.h.in
++++ b/src/config.h.in
+@@ -30,6 +30,9 @@
+ /* Define when __DATE__ " " __TIME__ can be used */
+ #undef HAVE_DATE_TIME
+ 
++/* Defined as the date of last modification */
++#undef BUILD_DATE
++
+ /* Define when __attribute__((unused)) can be used */
+ #undef HAVE_ATTRIBUTE_UNUSED
+ 
+diff --git a/src/configure.ac b/src/configure.ac
+index 2b7725b..21ca7a1 100644
+--- a/src/configure.ac
++++ b/src/configure.ac
+@@ -62,6 +62,16 @@ if test x"$ac_cv_prog_cc_c99" != xno; then
+   fi
+ fi
+ 
++dnl If $SOURCE_DATE_EPOCH is present in the environment, use that as the
++dnl "compiled" timestamp in :version's output.  Attempt to get the formatted
++dnl date using GNU date syntax, BSD date syntax, and finally falling back to
++dnl just using the current time.
++if test -n "$SOURCE_DATE_EPOCH"; then
++  DATE_FMT="%b %d %Y %H:%M:%S"
++  BUILD_DATE=$(LC_ALL=C date -u -d "@$SOURCE_DATE_EPOCH" "+$DATE_FMT" 2>/dev/null || LC_ALL=C date -u -r "$SOURCE_DATE_EPOCH" "+$DATE_FMT" 2>/dev/null || LC_ALL=C date -u "+$DATE_FMT")
++  AC_DEFINE_UNQUOTED(BUILD_DATE, ["$BUILD_DATE"])
++fi
++
+ dnl Check for the flag that fails if stuff are missing.
+ 
+ AC_MSG_CHECKING(--enable-fail-if-missing argument)
+diff --git a/src/version.c b/src/version.c
+index 9b2e7c9..0b86826 100644
+--- a/src/version.c
++++ b/src/version.c
+@@ -44,9 +44,13 @@ init_longVersion(void)
+      * VAX C can't catenate strings in the preprocessor.
+      */
+     strcpy(longVersion, VIM_VERSION_LONG_DATE);
++#ifdef BUILD_DATE
++    strcat(longVersion, BUILD_DATE);
++#else
+     strcat(longVersion, __DATE__);
+     strcat(longVersion, " ");
+     strcat(longVersion, __TIME__);
++#endif
+     strcat(longVersion, ")");
+ }
+ 
+@@ -54,7 +58,11 @@ init_longVersion(void)
+     void
+ init_longVersion(void)
+ {
++#ifdef BUILD_DATE
++    char *date_time = BUILD_DATE;
++#else
+     char *date_time = __DATE__ " " __TIME__;
++#endif
+     char *msg = _("%s (%s, compiled %s)");
+     size_t len = strlen(msg)
+ 		+ strlen(VIM_VERSION_LONG_ONLY)