A proper macro to test the flex version

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@857 48e7efb5-ca39-0410-a469-dd3cf9ba447f

diff --git a/acmacro/flex.m4 b/acmacro/flex.m4
new file mode 100644 (file)
index 0000000..1821e61
--- /dev/null
+++ b/acmacro/flex.m4
@@ -0,0 +1,50 @@
+dnl AC_PROG_FLEX: Check whether the LEXer is flex, and which version it has
+dnl The first arg must be a version number with 3 parts.
+
+dnl hint: I guess you want to check for a version number higher to 2.5.31
+
+AC_DEFUN([_AC_PROG_FLEX_HELPER_TOO_OLD],[
+  AC_MSG_NOTICE([Found flex is too old. Parsers won't get updated (Found v$FLEX_VERSION < v$1)])
+  LEX="$SHELL $missing_dir/missing flex";
+  AC_SUBST(LEXLIB, '')
+])
+
+AC_DEFUN([AC_PROG_FLEX],
+ [
+  AC_PROG_LEX
+  if test "$LEX" != flex; then
+    AC_MSG_NOTICE([Flex not found. Parsers won't get updated.])
+    LEX="$SHELL $missing_dir/missing flex";
+    AC_SUBST(LEXLIB, '')
+  else
+    if test "x$1" != "x" ; then
+      dnl
+      dnl We were asked to check the version number
+      dnl
+      set -x
+      changequote(<<, >>)dnl because of the regexp [blabla]
+      FLEX_VERSION=`flex --version | sed -e 's/^[^0-9]*//' -e 's/[^0-9]*$//'`
+
+      FLEX_VER_MAJ=`echo "$FLEX_VERSION" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)/\1/'`
+      FLEX_VER_MED=`echo "$FLEX_VERSION" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)/\2/'`
+      FLEX_VER_MIN=`echo "$FLEX_VERSION" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)/\3/'`
+
+      WANT_VER_MAJ=`echo $1 | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)/\1/'`;
+      WANT_VER_MED=`echo $1 | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)/\2/'`;
+      WANT_VER_MIN=`echo $1 | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)/\3/'`;
+      changequote([, ])dnl back to normality, there is no regexp afterward
+ 
+      if test "$FLEX_VER_MAJ" -lt "$WANT_VER_MAJ" ||
+         test "$FLEX_VER_MAJ" -eq "$WANT_VER_MAJ" -a "$FLEX_VER_MED" -lt "$WANT_VER_MED"  ||
+         test "$FLEX_VER_MAJ" -eq "$WANT_VER_MAJ" -a "$FLEX_VER_MED" -eq "$WANT_VER_MED" -a "$FLEX_VER_MIN" -lt "$WANT_VER_MIN" ;
+      then
+        AC_MSG_NOTICE([Found flex is too old. Parsers won't get updated (Found v$FLEX_VERSION < v$1)])
+        LEX="$SHELL $missing_dir/missing flex";
+        AC_SUBST(LEXLIB, '')
+      fi
+      set +x
+    fi
+  fi
+  AC_MSG_NOTICE([Flex found. Parsers will get updated])
+  exit 0
+])