X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=m4%2Fax_prog_bison_version.m4;h=5a8888dea2cc73fcf7cf1c871e448b2d140302d0;hb=540d833dfbe259815a0aec6a231dbe54a74aec4e;hp=6b95585560d160dc8e3435a1775596d8caad2424;hpb=2b4887a2a361c2eb166ab67c5c3ff9276a59bdf2;p=babeltrace.git

diff --git a/m4/ax_prog_bison_version.m4 b/m4/ax_prog_bison_version.m4
index 6b955855..5a8888de 100644
--- a/m4/ax_prog_bison_version.m4
+++ b/m4/ax_prog_bison_version.m4
@@ -1,46 +1,59 @@
+# ===========================================================================
+#   https://www.gnu.org/software/autoconf-archive/ax_prog_bison_version.html
+# ===========================================================================
+#
 # SYNOPSIS
 #
 #   AX_PROG_BISON_VERSION([VERSION],[ACTION-IF-TRUE],[ACTION-IF-FALSE])
 #
 # DESCRIPTION
 #
-#   Makes sure that bison version is greater or equal to the version indicated.
-#   If true the shell commands in ACTION-IF-TRUE are executed. If not the shell
-#   commands in commands in ACTION-IF-TRUE are executed. If not the shell
-#   commands in ACTION-IF-FALSE are run. Note if $BISON is not set (for example
-#   by running AC_CHECK_PROG or AC_PATH_PROG) the macro will fail.
+#   Makes sure that bison version is greater or equal to the version
+#   indicated. If true the shell commands in ACTION-IF-TRUE are executed. If
+#   not the shell commands in commands in ACTION-IF-TRUE are executed. If
+#   not the shell commands in ACTION-IF-FALSE are run. Note if $YACC is not
+#   set (for example by running AC_PROG_YACC or AC_PATH_PROG) the macro
+#   will fail.
 #
 #   Example:
 #
-#     AC_PATH_PROG([BISON],[bison])
+#     AC_PROG_YACC
 #     AX_PROG_BISON_VERSION([3.0.2],[ ... ],[ ... ])
 #
-#   This will check to make sure that the bison you have is at least
-#   version 3.0.2 or greater.
+#   This will check to make sure that the bison you have is at least version
+#   3.0.2 or greater.
 #
-#   NOTE: This macro uses the $BISON variable to perform the check.
+#   NOTE: This macro uses the $YACC variable to perform the check, if it's
+#   empty it will failover to the $BISON variable for backwards compatibility.
 #
 # LICENSE
 #
 #   Copyright (c) 2015 Jonathan Rajotte-Julien <jonathan.rajotte-julien@efficios.com>
+#                 2017 Michael Jeanson <mjeanson@efficios.com>
 #
 #   Copying and distribution of this file, with or without modification, are
 #   permitted in any medium without royalty provided the copyright notice
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 12
+#serial 4
 
 AC_DEFUN([AX_PROG_BISON_VERSION],[
     AC_REQUIRE([AC_PROG_SED])
     AC_REQUIRE([AC_PROG_GREP])
 
-    AS_IF([test -n "$BISON"],[
+     AS_IF([test -z "$YACC"],[
+         AS_IF([test -n "$BISON"],[
+             YACC=$BISON
+         ])
+     ])
+
+    AS_IF([test -n "$YACC"],[
         ax_bison_version="$1"
 
         AC_MSG_CHECKING([for bison version])
         changequote(<<,>>)
-        bison_version=`$BISON --version 2>&1 \
+        bison_version=`$YACC --version 2>&1 \
           | $SED -n -e '/bison (GNU Bison)/b inspect
 b
 : inspect