[PATCH] {maint} configure: report perl version in config.log

[Stefano Lattarini]

I will push this *to maint* in a couple of days if there are no objections.

Regards,
  Stefano

-*-*-*-

configure: report perl version in config.log

* configure.ac: Report the version of the selected perl interpreter
in config.log; this should render the logs more informative.
---
 ChangeLog    |    6 ++++++
 configure    |    6 ++++++
 configure.ac |    2 ++
 3 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 1e624a8..50aac4f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2011-11-17  Stefano Lattarini  <address@hidden>
+
+       configure: report perl version in config.log
+       * configure.ac: Report the version of the selected perl interpreter
+       in config.log; this should render the logs more informative.
+
 2011-11-13  Stefano Lattarini  <address@hidden>
 
        tests: fix spurious failure with older install-info
diff --git a/configure b/configure
index 5044112..7f3a0db 100755
--- a/configure
+++ b/configure
@@ -2335,6 +2335,12 @@ fi
 if test -z "$PERL"; then
    as_fn_error $? "perl not found" "$LINENO" 5
 fi
+# Save details about the selected perl interpreter in config.log.
+{ echo "$as_me:$LINENO: eval $PERL --version" >&5
+   (eval $PERL --version) >&5 2>&5
+   ac_status=$?
+   echo "$as_me:$LINENO: \$? = $ac_status" >&5
+   (exit $ac_status); }
 $PERL -e 'require 5.006;' || {
    as_fn_error $? "perl 5.6 or better is required; perl 5.8.2 or better
 is recommended.  If you have several perl versions
diff --git a/configure.ac b/configure.ac
index f804d18..b01026d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -60,6 +60,8 @@ AC_PATH_PROG(PERL, perl)
 if test -z "$PERL"; then
    AC_MSG_ERROR([perl not found])
 fi
+# Save details about the selected perl interpreter in config.log.
+AM_RUN_LOG([eval $PERL --version])
 $PERL -e 'require 5.006;' || {
    AC_MSG_ERROR(
 [perl 5.6 or better is required; perl 5.8.2 or better
-- 
1.7.2.3