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

[Stefano Lattarini]

* configure.ac: If possible, report the version of the selected
TeX program; this should render the logs more informative.
---
 ChangeLog    |    6 ++++++
 configure    |    8 ++++++++
 configure.ac |    4 ++++
 3 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 49b6e8b..5b86254 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2011-12-21  Stefano Lattarini  <address@hidden>
+
+       configure: report TeX version in config.log
+       * configure.ac: If possible, report the version of the selected
+       TeX program; this should render the logs more informative.
+
 2011-12-20  Peter Rosin  <address@hidden>
 
        tests: fix spurious failure on systems lacking unistd.h
diff --git a/configure b/configure
index 7f3a0db..34f8cc7 100755
--- a/configure
+++ b/configure
@@ -2419,6 +2419,14 @@ $as_echo "no" >&6; }
 fi
 
 
+# Save details about the selected TeX program in config.log.
+# Redirect input from /dev/null, as TeX might otherwise hang waiting
+# for input from the terminal.
+{ echo "$as_me:$LINENO: $TEX --version </dev/null" >&5
+   ($TEX --version </dev/null) >&5 2>&5
+   ac_status=$?
+   echo "$as_me:$LINENO: \$? = $ac_status" >&5
+   (exit $ac_status); }
 
 # Generate man pages.
 
diff --git a/configure.ac b/configure.ac
index b01026d..cfab4d7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -98,6 +98,10 @@ AC_SUBST([PERL_THREADS])
 
 # The test suite will skip some tests if tex is absent.
 AC_CHECK_PROG([TEX], [tex], [tex])
+# Save details about the selected TeX program in config.log.
+# Redirect input from /dev/null, as TeX might otherwise hang waiting
+# for input from the terminal.
+AM_RUN_LOG([$TEX --version </dev/null])
 
 # Generate man pages.
 AM_MISSING_PROG([HELP2MAN], [help2man])
-- 
1.7.7.3