[SCM] GNU Mailutils branch, master, updated. release-2.2-92-gd72be10

[Sergey Poznyakoff]

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http://git.savannah.gnu.org/cgit/mailutils.git/commit/?id=d72be105ae0d6bb538b3236466219a2f71538ecf

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      from  4bd61c62ed2208024109869c306467aa4511c0c0 (commit)

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- Log -----------------------------------------------------------------
commit d72be105ae0d6bb538b3236466219a2f71538ecf
Author: Sergey Poznyakoff <address@hidden>
Date:   Sun Sep 19 12:54:08 2010 +0300

    Avoid unnecessary rebuilds of git-describe and git-describe.h
    
    * Makefile.am: Avoid unnecessary rebuilds of git-describe and git-describe.h

-----------------------------------------------------------------------

Summary of changes:
 Makefile.am |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index e5c9423..78196e2 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -161,7 +161,10 @@ git-describe:
                dirty=`git diff-index --name-only HEAD 2>/dev/null` || dirty=;\
                test -n "$$dirty" && dirty="-dirty"; \
                descr=`git describe`; \
-               echo $${descr}$$dirty > git-describe; \
+               echo $${descr}$$dirty > git-describe.tmp; \
+               test -f git-describe && cmp git-describe.tmp git-describe || \
+                 cp git-describe.tmp git-describe; \
+               rm git-describe.tmp; \
        fi
 
 dist-hook: ChangeLog git-describe
@@ -179,7 +182,10 @@ git-describe.h: git-describe
          sed '1s/.*/#define GIT_DESCRIBE "&"/' $(srcdir)/git-describe; \
        else \
           echo "/* No git tag */"; \
-       fi > git-describe.h
+       fi > git-describe.h.tmp; \
+       test -f git-describe.h && cmp git-describe.h.tmp git-describe.h || \
+          cp git-describe.h.tmp git-describe.h; \
+       rm git-describe.h.tmp
 
 alpha: git-describe
        $(AM_V_GEN)if test -f $(srcdir)/git-describe; then \


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