Based on discussion I've chosen open-coded version without commit hash.

>> > > ...  Perhaps rename the r, o, rr and m temporaries.

I like it better with short names, there is no other code in that
script to clash with.  (Also, two adjacent case branches for hg and svn
are essentialy dead now).

>> ...  Perhaps also replace both HEAD occurences with $revision

not sure about that: should not they be exactly equivalent in all cases?

---
gcc_update: use human readable name for revision string in gcc/REVISION

contrib/Changelog:

        * gcc_update: derive human readable name for HEAD using git describe
        like "git gcc-descr" does.  Drop "revision" from gcc/REVISION.
---
 contrib/gcc_update | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/contrib/gcc_update b/contrib/gcc_update
index 80fac9fc995..558926b3a2d 100755
--- a/contrib/gcc_update
+++ b/contrib/gcc_update
@@ -332,7 +332,22 @@ case $vcs_type in
             exit 1
        fi
 
-       revision=`$GCC_GIT log -n1 --pretty=tformat:%p:%t:%H`
+       # Open-coded version of "git gcc-descr" from 
contrib/gcc-git-customization.sh
+       revision=`$GCC_GIT log -n1 --pretty=tformat:%h`
+       r=`$GCC_GIT describe --all --match 'basepoints/gcc-[0-9]*' HEAD \
+          | sed -n 
's,^\(tags/\)\?basepoints/gcc-\([0-9]\+\)-\([0-9]\+\)-g[0-9a-f]*$,r\2-\3,p;s,^\(tags/\)\?basepoints/gcc-\([0-9]\+\)$,r\2-0,p'`;
+       if test -n $r; then
+               o=`$GCC_GIT config --get gcc-config.upstream`;
+               rr=`echo $r | sed -n 
's,^r\([0-9]\+\)-[0-9]\+\(-g[0-9a-f]\+\)\?$,\1,p'`;
+               if $GCC_GIT rev-parse --verify --quiet 
${o:-origin}/releases/gcc-$rr >/dev/null; then
+                       m=releases/gcc-$rr;
+               else
+                       m=master;
+               fi;
+               if $GCC_GIT merge-base --is-ancestor HEAD ${o:-origin}/$m; then
+                       revision=$r;
+               fi
+       fi
        branch=`$GCC_GIT name-rev --name-only HEAD || :`
        ;;    
 
@@ -414,6 +429,6 @@ rm -f LAST_UPDATED gcc/REVISION
     date
     echo "`TZ=UTC date` (revision $revision)"
 } > LAST_UPDATED
-echo "[$branch revision $revision]" > gcc/REVISION
+echo "[$branch $revision]" > gcc/REVISION
 
 touch_files_reexec

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