From: Paul Eggert <eggert@cs.ucla.edu>
Date: Sun, 25 Aug 2013 01:22:22 +0000 (-0700)
Subject: build: don't require flex for ordinary builds
X-Git-Tag: v3.0.1~33
X-Git-Url: https://git.saurik.com/bison.git/commitdiff_plain/b5e27aa2625c1f84ea1ee75fe74374341664a759

build: don't require flex for ordinary builds

* configure.ac (LEX): Don't fail if this is lex, as flex is not
required for ordinary builds.  Instead, issue a warning and
substitute a no-op LEX.  Reported by Michael Felt in
<http://lists.gnu.org/archive/html/bug-bison/2013-08/msg00009.html>.
---

diff --git a/configure.ac b/configure.ac
index f7319a15..992e2033 100644
--- a/configure.ac
+++ b/configure.ac
@@ -175,7 +175,10 @@ AC_SUBST([YACC_LIBRARY])
 # Checks for programs.
 AM_MISSING_PROG([DOT], [dot])
 AC_PROG_LEX
-$LEX_IS_FLEX || AC_MSG_ERROR([Flex is required])
+$LEX_IS_FLEX || test "X$LEX" = X: || {
+  AC_MSG_WARN([bypassing lex because flex is required])
+  LEX=:
+}
 AC_PROG_YACC
 AC_PROG_RANLIB
 AC_PROG_GNU_M4