From: James McCoy 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 $SOURCE_DATE_EPOCH environment variable is defined, it will be used to populate the BUILD_DATE preprocessor define. If BUILD_DATE is not defined, the existing behavior of relying on the preprocessor's __DATE__/__TIME__ symbols will be used. [0]: https://reproducible-builds.org/ [1]: https://reproducible-builds.org/specs/source-date-epoch/ --- src/config.h.in | 3 +++ src/configure.ac | 10 ++++++++++ src/version.c | 8 ++++++++ 3 files changed, 21 insertions(+) diff --git a/src/config.h.in b/src/config.h.in index 5c8c7e5..436a0b7 100644 --- a/src/config.h.in +++ b/src/config.h.in @@ -30,6 +30,9 @@ /* Define when __DATE__ " " __TIME__ can be used */ #undef HAVE_DATE_TIME +/* Defined as the date of last modification */ +#undef BUILD_DATE + /* Define when __attribute__((unused)) can be used */ #undef HAVE_ATTRIBUTE_UNUSED diff --git a/src/configure.ac b/src/configure.ac index 8751b2e..cd43387 100644 --- a/src/configure.ac +++ b/src/configure.ac @@ -62,6 +62,16 @@ if test x"$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 c8361eb..e51c738 100644 --- a/src/version.c +++ b/src/version.c @@ -44,9 +44,13 @@ init_longVersion(void) * VAX C can't concatenate 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)