AT_PARSER_CHECK([./caller])
AT_CLEANUP
+
+## ----------------- ##
+## Several parsers. ##
+## ----------------- ##
+
+AT_SETUP([Several parsers])
+
+# AT_DATA_GRAMMAR_SEVERAL([PREFIX], [DIRECTIVES])
+# -----------------------------------------------
+# Generate and compile to *.o. Make sure there is no YY* nor yy* in
+# the header (but YYDEBUG and YYPARSE_PARAM).
+m4_define([AT_DATA_GRAMMAR_SEVERAL],
+[AT_BISON_OPTION_PUSHDEFS([%define api.prefix "$1_" $2])
+AT_DATA_GRAMMAR([$1.AT_SKEL_CC_IF([yy], [y])],
+[[%define api.prefix "$1_"
+$2
+%union
+{
+ int integer;
+}
+%{
+#include <stdio.h>
+ ]AT_YYERROR_DECLARE[
+ ]AT_YYLEX_DECLARE[
+%}
+%%
+exp:
+ 'x' '1' { printf ("x1\n"); }
+| 'x' '2' { printf ("x2\n"); }
+| 'x' '3' { printf ("x3\n"); }
+| 'x' '4' { printf ("x4\n"); }
+| 'x' '5' { printf ("x5\n"); }
+| 'x' '6' { printf ("x6\n"); }
+;
+
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE(["$1"])[
+]])
+
+AT_BISON_CHECK([-d -o AT_SKEL_CC_IF([$1.cc $1.yy], [$1.c $1.y])])
+# C++ output relies on namespaces and still uses yy a lot.
+AT_SKEL_CC_IF([],
+ [AT_CHECK([$EGREP yy $1.h], [1])])
+
+# Ignore comments. Ignore YYPARSE_PARAM. YYDEBUG (not renamed) can be
+# read, but not changed.
+AT_CHECK([[sed -ne 's,/\*[^*]*\*/,,g;s,//.*,,' \
+ -e '/YY/p' ]$1.AT_SKEL_CC_IF([hh], [h])[ |
+ $EGREP -wv '(YYPARSE_PARAM|defined YYDEBUG|if YYDEBUG)']],
+ [1])
+AT_LANG_COMPILE([$1.o])
+AT_BISON_OPTION_POPDEFS
+])
+
+AT_DATA([main.cc],
+[AT_DATA_SOURCE_PROLOGUE
+[extern "C"
+{
+ #include "x1.h"
+ #include "x2.h"
+ #include "x3.h"
+ #include "x4.h"
+}
+#include "x5.hh"
+//#include "x6.hh"
+
+#define ECHO(S) std::cerr << #S": " << S << std::endl;
+
+int
+main (void)
+{
+ ECHO(x1_parse());
+ ECHO(x2_parse());
+ ECHO(x3_parse());
+ ECHO(x4_parse());
+ x5_::parser p5;
+ ECHO(p5.parse());
+// x6_::parser p6;
+// ECHO(p6.parse());
+ return 0;
+}
+]])
+
+AT_DATA_GRAMMAR_SEVERAL([x1], [])
+AT_DATA_GRAMMAR_SEVERAL([x2], [%locations %debug])
+AT_DATA_GRAMMAR_SEVERAL([x3], [%glr-parser])
+AT_DATA_GRAMMAR_SEVERAL([x4], [%locations %debug %glr-parser])
+AT_DATA_GRAMMAR_SEVERAL([x5], [%locations %debug %language "c++"])
+#AT_DATA_GRAMMAR_SEVERAL([x5], [%locations %language "c++" %glr-parser])
+
+AT_COMPILE_CXX([parser], [x1.o x2.o x3.o x4.o x5.o main.cc])
+AT_CHECK([./parser], [0],
+[[x1
+x2
+x3
+x4
+x5
+]],
+[[x1_parse(): 0
+x2_parse(): 0
+x3_parse(): 0
+x4_parse(): 0
+p5.parse(): 0
+]])
+
+AT_CLEANUP