[commit: ghc] master: Improve the version numbers generated by the build system (0d86038)

[Ian Lynagh]

Repository : http://darcs.haskell.org/ghc.git/

On branch  : master

https://github.com/ghc/ghc/commit/0d860381cdca9ed9d92dc315358072a84696ba08

>---------------------------------------------------------------

commit 0d860381cdca9ed9d92dc315358072a84696ba08
Author: Ian Lynagh <ian at well-typed.com>
Date:   Fri Jun 7 22:37:04 2013 +0100

    Improve the version numbers generated by the build system
    
    If we can't find a better date to use, then use today's date.

>---------------------------------------------------------------

 aclocal.m4 | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/aclocal.m4 b/aclocal.m4
index 10c460b..be0d113 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1551,6 +1551,15 @@ if test "$RELEASE" = "NO"; then
         AC_MSG_RESULT(given $PACKAGE_VERSION)
     else
         AC_MSG_WARN([cannot determine snapshot version: no .git directory and no VERSION file])
+        dnl We'd really rather this case didn't happenm but it might
+        dnl do (in particular, people using lndir trees may find that
+        dnl the build system can't find any other date). If it does
+        dnl happen, then we use the current date.
+        dnl This way we get some idea about how recent a build is.
+        dnl It also means that packages built for 2 different builds
+        dnl will probably use different version numbers, so things are
+        dnl less likely to go wrong.
+        PACKAGE_VERSION=${PACKAGE_VERSION}.`date +%Y%m%d`
     fi
 fi