Follow-up Comment #8, sr #110312 (project autoconf):
In order to mimic flex's '%option noyywrap', the generated scanner code
(inserted between the first and second %%) needs a declaration (or definition)
of yywrap _before_ the first %%:
Applying
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; }
to
$ git describe
v2.69c-18-gf1047b2e
(NB: this excludes the commit 46f384f850, 'Revert to 2.69-compatible behavior
in AC_PROG_LEX')
makes configure print (for Zack's test configure.ac below)
checking for lex output file root... lex.yy
checking for lex library... none needed
checking whether yytext is a pointer... yes
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