From: Jannick <thirdedition@gmx.net>
Date: Tue, 3 Nov 2020 15:11:23 +0000 (-0500)
Subject: _AC_PROG_YYTEXT_DECL: Forward declare yywrap (#110312)
X-Git-Tag: v2.69d~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=15ada9d3a0e46c28c0a3af2357b64bbd14d818a8;p=thirdparty%2Fautoconf.git

_AC_PROG_YYTEXT_DECL: Forward declare yywrap (#110312)

Some versions of lex need you to forward-declare yywrap in a %{ %}
block before the rules section, if you’re going to define it yourself.

May help with bug #110312.

* lib/autoconf/programs.m4 (_AC_PROG_LEX_YYTEXT_DECL): In the test
  input to lex, forward-declare yywrap before the rules.
---

diff --git a/lib/autoconf/programs.m4 b/lib/autoconf/programs.m4
index e289a018..b352ce24 100644
--- a/lib/autoconf/programs.m4
+++ b/lib/autoconf/programs.m4
@@ -746,6 +746,9 @@ fi])])
 # declares yytext as a char * by default.
 AC_DEFUN([_AC_PROG_LEX_YYTEXT_DECL],
 [cat >conftest.l <<_ACEOF[
+%{
+int yywrap(void);
+%}
 %%
 a { ECHO; }
 b { REJECT; }