RFR: ccache 3.1.9 not being recognized on Solaris

[Chris Hegarty]

Erik,

I have a build of ccache 3.1.9 on my Solaris box, but it is not being 
used by the build as it thinks it is not greater than 3.1.4.

The suggested changes (below) are in line with the grep/regular 
expression used in the GNU make version check you and Vinnie were 
discussing yesterday. Additionally, a more informative notice is given 
in the case where the version is not accepted.

I suggest the following changes, with appropriate, and uninteresting, 
updates to generated-configure.sh (s).

diff -r 187a759c08ba common/autoconf/build-performance.m4
--- a/common/autoconf/build-performance.m4      Wed Oct 02 04:21:42 2013 
+0100
+++ b/common/autoconf/build-performance.m4      Thu Oct 31 12:30:46 2013 
+0000
@@ -197,8 +197,11 @@ AC_DEFUN([BPERF_SETUP_CCACHE_USAGE],
          # Only use ccache if it is 3.1.4 or later, which supports
          # precompiled headers.
          AC_MSG_CHECKING([if ccache supports precompiled headers])
-        HAS_GOOD_CCACHE=`($CCACHE --version | head -n 1 | grep -E 
3.1.@<:@456789@:>@) 2> /dev/null`
+
+        CCACHE_VERSION_STRING=`$CCACHE --version | head -n 1`
+        HAS_GOOD_CCACHE=`($ECHO $CCACHE_VERSION_STRING | $GREP -e 
'3\.1\.[[456789]]') 2> /dev/null`
          if test "x$HAS_GOOD_CCACHE" = x; then
+            AC_MSG_NOTICE([Found $CCACHE, however this is not version 
3.1.4 or later. (it is: $CCACHE_VERSION_STRING). Ignoring.])
              AC_MSG_RESULT([no, disabling ccache])
              CCACHE=
          else

I will verify, in our infrastructure, that machines that previously were 
using ccache still do so ( after these changes ).

-Chris.