doc: fixes in the C++ part

[bison.git] / m4 / flex.m4

diff --git a/m4/flex.m4 b/m4/flex.m4
index 2073a0dc0b1be77238a20ed39ec483e1241af835..11dc433d98e60bd978bdb84bf13487489285d8a6 100644 (file)
--- a/m4/flex.m4
+++ b/m4/flex.m4
@@ -1,5 +1,5 @@
-# flex.m4 serial 1
-# Copyright (C) 2012 Free Software Foundation, Inc.
+# flex.m4 serial 2
+# Copyright (C) 2012-2015 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
@@ -24,7 +24,7 @@ fi])
 # and whether Lex declares yytext as a char * by default.
 m4_define([_AC_PROG_LEX_YYTEXT_DECL],
 [AC_CACHE_CHECK([whether lex is flex],
-                [ac_cv_prog_flex],
+                [ac_cv_prog_lex_is_flex],
 [cat >conftest.l <<_ACEOF[
 %option debug nodefault noinput nounput noyywrap never-interactive
 %x SC_CONF_TEST
@@ -32,15 +32,13 @@ m4_define([_AC_PROG_LEX_YYTEXT_DECL],
 a { BEGIN SC_CONF_TEST; }
 ]_ACEOF
 if _AC_DO_VAR([LEX conftest.l]); then
-  ac_cv_prog_flex=yes
+  ac_cv_prog_lex_is_flex=yes
 else
-  ac_cv_prog_flex=no
+  ac_cv_prog_lex_is_flex=no
 fi
 ])
-FLEX=
-if test $ac_cv_prog_flex = yes; then
-  AC_SUBST([FLEX], [yes])dnl
-fi
+AC_SUBST([LEX_IS_FLEX],
+         [`test "$ac_cv_prog_lex_is_flex" = yes && echo true || echo false`])dnl
 
 cat >conftest.l <<_ACEOF[
 %%
@@ -80,7 +78,7 @@ if test -z "${LEXLIB+set}"; then
     for ac_lib in '' -lfl -ll; do
       LIBS="$ac_lib $ac_save_LIBS"
       AC_LINK_IFELSE([AC_LANG_DEFINES_PROVIDED[`cat $LEX_OUTPUT_ROOT.c`]],
-       [ac_cv_lib_lex=$ac_lib])
+        [ac_cv_lib_lex=$ac_lib])
       test "$ac_cv_lib_lex" != 'none needed' && break
     done
     LIBS=$ac_save_LIBS
@@ -106,8 +104,8 @@ LIBS=$ac_save_LIBS
 dnl
 if test $ac_cv_prog_lex_yytext_pointer = yes; then
   AC_DEFINE([YYTEXT_POINTER], [1],
-           [Define to 1 if `lex' declares `yytext' as a `char *' by default,
-            not a `char[]'.])
+            [Define to 1 if `lex' declares `yytext' as a `char *' by default,
+             not a `char[]'.])
 fi
 rm -f conftest.l $LEX_OUTPUT_ROOT.c
 ])# _AC_PROG_LEX_YYTEXT_DECL