[vim] 05/07: Support defining compilation date in $SOURCE_DATE_EPOCH

[James McCoy]

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jamessan pushed a commit to branch debian/sid
in repository vim.

commit f3d2750f9dcd625127c7f7f01b9f98cc5e38469f
Author: James McCoy <jamessan at jamessan.com>
Date:   Thu Jan 28 10:55:11 2016 -0500

    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.in | 10 ++++++++++
 src/version.c    |  6 ++++++
 3 files changed, 19 insertions(+)

diff --git a/src/config.h.in b/src/config.h.in
index 9d35e48..86ee967 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.in b/src/configure.in
index f29b62c..97948af 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -29,6 +29,16 @@ dnl in autoconf needs it, where it uses STDC_HEADERS.
 AC_HEADER_STDC
 AC_HEADER_SYS_WAIT
 
+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 333c0d8..56d7184 100644
--- a/src/version.c
+++ b/src/version.c
@@ -43,11 +43,17 @@ make_version(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, ")");
 }
+# elif defined(BUILD_DATE)
+char	*longVersion = VIM_VERSION_LONG_DATE BUILD_DATE ")";
 # else
 char	*longVersion = VIM_VERSION_LONG_DATE __DATE__ " " __TIME__ ")";
 # endif

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