From: Ruben Kerkhof <ruben@rubenkerkhof.com>
Date: Sat, 27 Dec 2014 17:11:55 +0000 (+0100)
Subject: Check for bison instead of yacc
X-Git-Tag: rec-3.7.0-rc1~67^2~22^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=refs%2Fpull%2F2014%2Fhead;p=thirdparty%2Fpdns.git

Check for bison instead of yacc

Bail out if we need it but can't find it.
Part of #774
---

diff --git a/configure.ac b/configure.ac
index 19cda86960..1b36736a66 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,7 +18,7 @@ AC_CANONICAL_HOST
 
 AC_PROG_CC
 AM_PROG_CC_C_O
-AC_PROG_YACC
+PDNS_CHECK_BISON
 AM_PROG_LEX
 AC_PROG_INSTALL
 AC_PROG_MAKE_SET
diff --git a/m4/pdns_check_bison.m4 b/m4/pdns_check_bison.m4
new file mode 100644
index 0000000000..7f1c83c13e
--- /dev/null
+++ b/m4/pdns_check_bison.m4
@@ -0,0 +1,15 @@
+AC_DEFUN([PDNS_CHECK_BISON], [
+  AC_REQUIRE([AC_PROG_YACC])
+  AC_REQUIRE([AC_PROG_EGREP])
+
+  AC_CACHE_CHECK([if bison is the parser generator],[pdns_cv_prog_bison],[
+    AS_IF([$YACC --version 2>/dev/null | $EGREP -q '^bison '],
+      [pdns_cv_prog_bison=yes], [pdns_cv_prog_bison=no])
+  ])
+
+  AS_IF([test "x$pdns_cv_prog_bison" = "xno"], [
+    AS_IF([test ! -f "${srcdir}/pdns/bindparser.cc"],
+      [AC_MSG_ERROR([bison is missing and you don't have ${srcdir}/pdns/bindparser.cc. Please install bison])]
+    )]
+  )
+])