From 04289b3e2ad9e6ff6593b6df991f28c704fd8039 Mon Sep 17 00:00:00 2001
From: Dana Robinson <derobins@hdfgroup.org>
Date: Fri, 25 Sep 2015 15:49:24 -0500
Subject: [svn-r27878] Updated autogen.sh script to be more informative about
 missing flex/bison.

Tested on: local linux
---
 autogen.sh | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/autogen.sh b/autogen.sh
index 237e1b1..fa2e2d2 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -396,15 +396,37 @@ bin/make_overflow src/H5overflow.txt || exit 1
 # to install a later version of bison. See the OS X note at the top
 # of this script.
 echo
-echo "Running flex/bison:"
-cd hl/src
+echo "Generating H5LT parser code (requires yacc/bison):"
 echo "Generate hl/src/H5LTparse.c from hl/src/H5LTparse.y"
+# HDF5_BISON is set via the environment or 'which bison', above
+if test -z ${HDF5_BISON}; then
+    echo
+    echo "*************************"
+    echo " ERROR - bison not found"
+    echo "*************************"
+    echo "bison is required to generate parser code in H5LT"
+    echo
+    exit 127
+fi
+cd hl/src
 if [ "$verbose" = true ] ; then
     ${HDF5_BISON} --version
 fi
 ${HDF5_BISON} -pH5LTyy -o H5LTparse.c -d H5LTparse.y
 
+echo
+echo "Generating H5LT lexer code (requires lex/flex):"
 echo "Generate hl/src/H5LTanalyze.c from hl/src/H5LTanalyze.l"
+# HDF5_FLEX is set via the environment or 'which flex', above
+if test -z ${HDF5_FLEX}; then
+    echo
+    echo "************************"
+    echo " ERROR - flex not found"
+    echo "************************"
+    echo "flex is required to generate lexer code in H5LT"
+    echo
+    exit 127
+fi
 if [ "$verbose" = true ] ; then
     ${HDF5_FLEX} --version
 fi
-- 
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