X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/6c88b51e8395fe490c15ede2f1b2562258a4260d..746ac9aa81dd638d35ef43b75cefaff4af7afd48:/tests/local.at?ds=sidebyside

diff --git a/tests/local.at b/tests/local.at
index 27aaef4f..ff39787c 100644
--- a/tests/local.at
+++ b/tests/local.at
@@ -1,7 +1,8 @@
 # Process this -*- Autotest -*- file with autom4te.
 
 # Macros for the GNU Bison Test suite.
-# Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+
+# Copyright (C) 2003-2012 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -20,10 +21,45 @@
 m4_version_prereq([2.58])
 
 
+## ------------- ##
+## Basic tests.  ##
+## ------------- ##
+
+# AT_MATCHES_CHECK(FILE, PERL-REGEXP, COUNT)
+# ------------------------------------------
+# Expect COUNT matches of the PERL-REGEXP in FILE.  The file is
+# taken in "slurp" mode, i.e., one can match end-of-lines.
+m4_define([AT_MATCHES_CHECK],
+[AT_CHECK([perl -0777 -ne '
+my $count = 0;
+s{$2}{ ++$count; "" }gem;
+printf "$count\n";' $1], [0], [$3
+])])
+
+
 ## ------------------------------- ##
 ## Macros decoding Bison options.  ##
 ## ------------------------------- ##
 
+# AT_LOC_PUSHDEF(FIRST-LINE, FIRST-COLUMN, LAST-LINE, LAST-COLUMN)
+# ----------------------------------------------------------------
+# Pushdef AT_LOC_(FIRST|LAST)_(LINE|COLUMN).
+m4_define([AT_LOC_PUSHDEF],
+[m4_pushdef([AT_LOC_FIRST_LINE],  [AT_LOC.$1])
+m4_pushdef([AT_LOC_FIRST_COLUMN], [AT_LOC.$2])
+m4_pushdef([AT_LOC_LAST_LINE],    [AT_LOC.$3])
+m4_pushdef([AT_LOC_LAST_COLUMN],  [AT_LOC.$4])])
+
+# AT_LOC_POPDEF
+# -------------
+# Popdef AT_LOC_(FIRST|LAST)_(LINE|COL).
+m4_define([AT_LOC_POPDEF],
+[m4_popdef([AT_LOC_FIRST_LINE])
+m4_popdef([AT_LOC_FIRST_COLUMN])
+m4_popdef([AT_LOC_LAST_LINE])
+m4_popdef([AT_LOC_LAST_COLUMN])])
+
+
 
 # AT_BISON_OPTION_PUSHDEFS([BISON-OPTIONS])
 # -----------------------------------------
@@ -35,7 +71,7 @@ m4_define([AT_BISON_OPTION_PUSHDEFS],
 # --------------------------------------------------
 # This macro works around the impossibility to define macros
 # inside macros, because issuing `[$1]' is not possible in M4 :(.
-# This sucks hard, GNU M4 should really provide M5 like $$1.
+# This sucks hard, GNU M4 should really provide M5-like $$1.
 m4_define([_AT_BISON_OPTION_PUSHDEFS],
 [m4_if([$1$2], $[1]$[2], [],
        [m4_fatal([$0: Invalid arguments: $@])])dnl
@@ -43,6 +79,8 @@ m4_pushdef([AT_DEFINES_IF],
 [m4_bmatch([$3], [%defines], [$1], [$2])])
 m4_pushdef([AT_SKEL_CC_IF],
 [m4_bmatch([$3], [%language "[Cc]\+\+"\|%skeleton "[a-z0-9]+\.cc"], [$1], [$2])])
+m4_pushdef([AT_SKEL_JAVA_IF],
+[m4_bmatch([$3], [%language "[Jj][Aa][Vv][Aa]"\|%skeleton "[a-z0-9]+\.java"], [$1], [$2])])
 m4_pushdef([AT_GLR_IF],
 [m4_bmatch([$3], [%glr-parser\|%skeleton "glr\.], [$1], [$2])])
 m4_pushdef([AT_LALR1_CC_IF],
@@ -54,13 +92,15 @@ m4_pushdef([AT_YACC_IF],
 [m4_bmatch([$3], [%language\|%glr-parser\|%skeleton], [$2], [$1])])
 m4_pushdef([AT_LEXPARAM_IF],
 [m4_bmatch([$3], [%lex-param], [$1], [$2])])
-m4_pushdef([AT_PARAM_IF],
-[m4_bmatch([$3], [%parse-param], [$1], [$2])])
 m4_pushdef([AT_LOCATION_IF],
 [m4_bmatch([$3], [%locations], [$1], [$2])])
+m4_pushdef([AT_LOCATION_TYPE_IF],
+[m4_bmatch([$3], [%define location_type], [$1], [$2])])
+m4_pushdef([AT_PARAM_IF],
+[m4_bmatch([$3], [%parse-param], [$1], [$2])])
 m4_pushdef([AT_PURE_IF],
 [m4_bmatch([$3], [%define  *api\.pure\|%pure-parser],
-           [m4_bmatch([$3], [%define  *api\.pure *"false"], [$2], [$1])],
+           [m4_bmatch([$3], [%define  *api\.pure *"?false"?], [$2], [$1])],
            [$2])])
 m4_pushdef([AT_PURE_AND_LOC_IF],
 [m4_bmatch([$3], [%locations], [AT_PURE_IF($@)], [$2])])
@@ -70,37 +110,40 @@ m4_pushdef([AT_NAME_PREFIX],
 [m4_bmatch([$3], [%name-prefix ".*"],
            [m4_bregexp([$3], [name-prefix "\([^"]*\)"], [\1])],
            [yy])])
+m4_pushdef([AT_TOKEN_PREFIX],
+[m4_bmatch([$3], [%define api.tokens.prefix ".*"],
+           [m4_bregexp([$3], [%define api.tokens.prefix "\(.*\)"], [\1])])])
 # yyerror receives the location if %location & %pure & (%glr or %parse-param).
 m4_pushdef([AT_YYERROR_ARG_LOC_IF],
 [AT_GLR_OR_PARAM_IF([AT_PURE_AND_LOC_IF([$1], [$2])],
-		    [$2])])
+                    [$2])])
 # yyerror always sees the locations (when activated), except if
 # (yacc & pure & !param).  FIXME: This is wrong.  See the manual.
 m4_pushdef([AT_YYERROR_SEES_LOC_IF],
 [AT_LOCATION_IF([AT_YACC_IF([AT_PURE_IF([AT_PARAM_IF([$1], [$2])],
-					[$1])],
-			    [$1])],
-		[$2])])
+                                        [$1])],
+                            [$1])],
+                [$2])])
 
 # The interface is pure: either because %define api.pure, or because we
 # are using the C++ parsers.
 m4_pushdef([AT_PURE_LEX_IF],
 [AT_PURE_IF([$1],
-	    [AT_SKEL_CC_IF([$1], [$2])])])
+            [AT_SKEL_CC_IF([$1], [$2])])])
 
 AT_PURE_LEX_IF(
 [m4_pushdef([AT_LOC], [(*llocp)])
  m4_pushdef([AT_VAL], [(*lvalp)])
  m4_pushdef([AT_LEX_FORMALS],
-	    [YYSTYPE *lvalp[]AT_LOCATION_IF([, YYLTYPE *llocp])])
+            [YYSTYPE *lvalp[]AT_LOCATION_IF([, YYLTYPE *llocp])])
  m4_pushdef([AT_LEX_ARGS],
-	    [lvalp[]AT_LOCATION_IF([, llocp])])
+            [lvalp[]AT_LOCATION_IF([, llocp])])
  m4_pushdef([AT_USE_LEX_ARGS],
-	    [(void) lvalp;AT_LOCATION_IF([(void) llocp])])
+            [(void) lvalp;AT_LOCATION_IF([(void) llocp])])
  m4_pushdef([AT_LEX_PRE_FORMALS],
-	    [AT_LEX_FORMALS, ])
+            [AT_LEX_FORMALS, ])
  m4_pushdef([AT_LEX_PRE_ARGS],
-	    [AT_LEX_ARGS, ])
+            [AT_LEX_ARGS, ])
 ],
 [m4_pushdef([AT_LOC], [[(]AT_NAME_PREFIX[lloc)]])
  m4_pushdef([AT_VAL], [[(]AT_NAME_PREFIX[lval)]])
@@ -110,6 +153,17 @@ AT_PURE_LEX_IF(
  m4_pushdef([AT_LEX_PRE_FORMALS], [])
  m4_pushdef([AT_LEX_PRE_ARGS],    [])
 ])
+
+# Handle the different types of location components.
+
+AT_SKEL_CC_IF(
+  [AT_LOCATION_TYPE_IF(
+    [AT_LOC_PUSHDEF([first.l], [first.c], [last.l], [last.c])],
+    [AT_LOC_PUSHDEF([begin.line], [begin.column], [end.line], [end.column])])],
+  [AT_LOC_PUSHDEF([first_line], [first_column], [last_line], [last_column])])
+
+
+AT_GLR_IF([AT_KEYWORDS([glr])])
 ])# _AT_BISON_OPTION_PUSHDEFS
 
 
@@ -129,15 +183,18 @@ m4_popdef([AT_YYERROR_ARG_LOC_IF])
 m4_popdef([AT_NAME_PREFIX])
 m4_popdef([AT_GLR_OR_PARAM_IF])
 m4_popdef([AT_PURE_AND_LOC_IF])
+m4_popdef([AT_LOCATION_TYPE_IF])
 m4_popdef([AT_LOCATION_IF])
 m4_popdef([AT_PARAM_IF])
 m4_popdef([AT_LEXPARAM_IF])
 m4_popdef([AT_YACC_IF])
 m4_popdef([AT_GLR_IF])
 m4_popdef([AT_SKEL_CC_IF])
+m4_popdef([AT_SKEL_JAVA_IF])
 m4_popdef([AT_GLR_CC_IF])
 m4_popdef([AT_LALR1_CC_IF])
 m4_popdef([AT_DEFINES_IF])
+AT_LOC_POPDEF
 ])# AT_BISON_OPTION_POPDEFS
 
 
@@ -190,8 +247,10 @@ $2])
 
 # AT_BISON_CHECK(BISON_ARGS, [OTHER_AT_CHECK_ARGS])
 # -------------------------------------------------
-# Check Bison by invoking `bison BISON_ARGS'.  OTHER_AT_CHECK_ARGS are the
-# usual remaining arguments to AT_CHECK: STATUS, STDOUT, etc.
+# Check Bison by invoking `bison BISON_ARGS'.  BISON_ARGS should not contain
+# shell constructs (such as redirection or pipes) that would prevent
+# appending additional command-line arguments for bison. OTHER_AT_CHECK_ARGS
+# are the usual remaining arguments to AT_CHECK: STATUS, STDOUT, etc.
 #
 # This macro or AT_BISON_CHECK_NO_XML should always be used whenever invoking
 # Bison in the test suite.  For now it ensures that:
@@ -202,11 +261,19 @@ $2])
 #
 #   2. In the case of maintainer-xml-check, XML/XSLT output is compared with
 #      --graph and --report=all output for every working grammar.
+#
+#   3. If stderr contains a warning, -Werror and --warnings=error
+#      convert the warning to an error.
+#
+#   4. If stderr contains a warning, -Wnone and --warnings=none suppress it.
 m4_define([AT_BISON_CHECK],
 [m4_if(m4_quote($2), [0], [AT_BISON_CHECK_XML($@)],
        m4_quote($2), [], [AT_BISON_CHECK_XML($@)])
 AT_BISON_CHECK_NO_XML($@)])
 
+m4_define([AT_BISON_WERROR_MSG],
+          [[bison: warnings being treated as errors]])
+
 # AT_BISON_CHECK_NO_XML(BISON_ARGS, [OTHER_AT_CHECK_ARGS])
 # --------------------------------------------------------
 # Same as AT_BISON_CHECK except don't perform XML/XSLT checks.  This is useful
@@ -214,7 +281,81 @@ AT_BISON_CHECK_NO_XML($@)])
 # handle.
 m4_define([AT_BISON_CHECK_NO_XML],
 [AT_CHECK(m4_if(m4_quote($2), [0], [], m4_quote($2), [], [],
-                [AT_QUELL_VALGRIND ])[[bison ]]$@)])
+                [AT_QUELL_VALGRIND ])[[bison ]]$@)
+m4_if(m4_bregexp([$4], [: warning: ]), [-1], [],
+      m4_quote(m4_if(m4_quote($2), [], [0], [$2])), [0], [[
+        # Defining POSIXLY_CORRECT causes bison to complain if options
+        # are added after the grammar file name, so skip these checks
+        # in that case.
+        if test -z "${POSIXLY_CORRECT+set}"; then
+          # Don't interfere with caller's files.
+          if test -f stderr; then mv stderr at-bison-check-stderr.bak; fi
+          if test -f experr; then mv experr at-bison-check-experr.bak; fi
+          if test -f expout; then mv expout at-bison-check-expout.bak; fi
+
+          # To avoid expanding it repeatedly, store specified stdout.
+          ]AT_DATA([expout], [$3])[
+
+          # Run with -Werror.
+          ]AT_CHECK(AT_QUELL_VALGRIND[[ bison ]$1[ -Werror]],
+                    [[1]], [expout], [stderr])[
+
+          # Build expected stderr up to and including the "warnings being
+          # treated as errors" message.
+          ]AT_DATA([[at-bison-check-warnings]], [$4])[
+          at_bison_check_first=`sed -n \
+            '/: warning: /{=;q;}' at-bison-check-warnings`
+          : ${at_bison_check_first:=1}
+          at_bison_check_first_tmp=`sed -n \
+            '/conflicts: [0-9].*reduce$/{=;q;}' at-bison-check-warnings`
+          : ${at_bison_check_first_tmp:=1}
+          if test $at_bison_check_first_tmp -lt $at_bison_check_first; then
+            at_bison_check_first=$at_bison_check_first_tmp
+          fi
+          if test $at_bison_check_first -gt 1; then
+            sed -n "1,`expr $at_bison_check_first - 1`"p \
+              at-bison-check-warnings > experr
+          fi
+          echo ']AT_BISON_WERROR_MSG[' >> experr
+
+          # Finish building expected stderr and check.  Unlike warnings,
+          # complaints cause bison to exit early.  Thus, with -Werror, bison
+          # does not necessarily report all warnings that it does without
+          # -Werror, but it at least reports one.
+          at_bison_check_last=`sed -n '$=' stderr`
+          : ${at_bison_check_last:=1}
+          at_bison_check_last=`expr $at_bison_check_last - 1`
+          sed -n "$at_bison_check_first,$at_bison_check_last"p \
+            at-bison-check-warnings >> experr
+          ]AT_CHECK([[sed 's,.*/\(]AT_BISON_WERROR_MSG[\)$,\1,' \
+                      stderr 1>&2]], [[0]], [[]], [experr])[
+
+          # Now check --warnings=error.
+          cp stderr experr
+          ]AT_CHECK(AT_QUELL_VALGRIND[[ bison ]$1[ --warnings=error]],
+                    [[1]], [expout], [experr])[
+
+          # Now check -Wnone and --warnings=none by making sure that
+          # -Werror doesn't change the exit status when -Wnone or
+          # --warnings=none is specified.
+          ]AT_CHECK(AT_QUELL_VALGRIND[[ bison ]$1[ -Wnone -Werror]],
+                    [[0]], [expout])[
+          ]AT_CHECK(AT_QUELL_VALGRIND[[ bison ]$1[ --warnings=none \
+                    -Werror]], [[0]], [expout])[
+
+          # Restore caller's files.
+          if test -f at-bison-check-expout.bak; then
+            mv at-bison-check-expout.bak expout
+          fi
+          if test -f at-bison-check-experr.bak; then
+            mv at-bison-check-experr.bak experr
+          fi
+          if test -f at-bison-check-stderr.bak; then
+            mv at-bison-check-stderr.bak stderr
+          fi
+        fi
+      ]])
+])
 
 # AT_BISON_CHECK_XML(BISON_ARGS, [OTHER_AT_CHECK_ARGS])
 # -----------------------------------------------------
@@ -273,7 +414,7 @@ m4_define([AT_QUELL_VALGRIND],
 # assume that we are linking too; this is a hack.
 m4_define([AT_COMPILE],
 [AT_CHECK([$CC $CFLAGS $CPPFLAGS m4_bmatch([$1], [[.]], [], [$LDFLAGS ])-o $1 m4_default([$2], [$1.c])[]m4_bmatch([$1], [[.]], [], [ $LIBS])],
-	   0, [ignore], [ignore])])
+           0, [ignore], [ignore])])
 
 # AT_COMPILE_CXX(OUTPUT, [SOURCES = OUTPUT.cc])
 # --------------------------------------------
@@ -284,21 +425,40 @@ m4_define([AT_COMPILE_CXX],
 [AT_KEYWORDS(c++)
 AT_CHECK([$BISON_CXX_WORKS], 0, ignore, ignore)
 AT_CHECK([$CXX $CXXFLAGS $CPPFLAGS m4_bmatch([$1], [[.]], [], [$LDFLAGS ])-o $1 m4_default([$2], [$1.cc])[]m4_bmatch([$1], [[.]], [], [ $LIBS])],
-	 0, [ignore], [ignore])])
+         0, [ignore], [ignore])])
 
+# AT_JAVA_COMPILE(SOURCES)
+# ------------------------
+# Compile SOURCES into Java class files.  Skip the test if java or javac
+# is not installed.
+m4_define([AT_JAVA_COMPILE],
+[AT_KEYWORDS(java)
+AT_CHECK([[test -n "$CONF_JAVA" || exit 77
+           test -n "$CONF_JAVAC" || exit 77]])
+AT_CHECK([[$SHELL ../../../javacomp.sh ]$1],
+         [[0]], [ignore], [ignore])])
 
 # AT_FULL_COMPILE(OUTPUT, [OTHER])
 # --------------------------------
-# Compile OUTPUT.y to OUTPUT.c or OUTPUT.cc, and compile it to OUTPUT.
-# If OTHER is specified, compile OUTPUT-OTHER.c or OUTPUT-OTHER.cc to OUTPUT
-# along with it.
-# Relies on AT_SKEL_CC_IF.
-m4_define([AT_FULL_COMPILE],
-[AT_SKEL_CC_IF(
-  [AT_BISON_CHECK([-o $1.cc $1.y])
-   AT_COMPILE_CXX([$1]m4_ifval($2, [, [$1.cc $1-$2.cc]]))],
-  [AT_BISON_CHECK([-o $1.c $1.y])
-   AT_COMPILE([$1]m4_ifval($2, [, [$1.c $1-$2.c]]))])
+# Compile OUTPUT.y to OUTPUT.c, OUTPUT.cc, or OUTPUT.java, and then
+# compile it to OUTPUT or OUTPUT.class.  If OTHER is specified, compile
+# OUTPUT-OTHER.c, OUTPUT-OTHER.cc, or OUTPUT-OTHER.java to OUTPUT or
+# OUTPUT.java along with it.  Relies on AT_SKEL_CC_IF and
+# AT_SKEL_JAVA_IF.
+m4_define([AT_FULL_COMPILE], [
+  AT_SKEL_JAVA_IF([
+    AT_BISON_CHECK([[-o ]$1[.java ]$1[.y]])
+    AT_JAVA_COMPILE([$1[.java]]m4_ifval($2,
+                                        [[$1[.java ]$1[-]$2[.java]]]))
+  ], [
+    AT_SKEL_CC_IF([
+      AT_BISON_CHECK([[-o ]$1[.cc ]$1[.y]])
+      AT_COMPILE_CXX([$1]m4_ifval($2, [, [$1[.cc ]$1[-]$2[.cc]]]))
+    ], [
+      AT_BISON_CHECK([[-o ]$1[.c ]$1[.y]])
+      AT_COMPILE([$1]m4_ifval($2, [, [$1[.c ]$1[-]$2[.c]]]))
+    ])
+  ])
 ])
 
 
@@ -312,6 +472,170 @@ m4_define([AT_FULL_COMPILE],
 m4_define([AT_PARSER_CHECK],
 [AT_CHECK([$5 $PREPARSER $1], [$2], [$3], [$4])])
 
+# AT_JAVA_PARSER_CHECK(COMMAND, EXIT-STATUS, EXPOUT, EXPERR, [PRE])
+# -----------------------------------------------------------------
+m4_define([AT_JAVA_PARSER_CHECK],
+[AT_CHECK([$5[ $SHELL ../../../javaexec.sh ]$1], [$2], [$3], [$4])])
+
+# AT_TEST_TABLES_AND_PARSE(TITLE, COND-VALUE, TEST-SPEC,
+#                          DECLS, GRAMMAR, INPUT,
+#                          BISON-STDERR, TABLES-OR-LAST-STATE,
+#                          [OTHER-CHECKS],
+#                          [PARSER-EXIT-VALUE],
+#                          [PARSER-STDOUT], [PARSER-STDERR])
+# -------------------------------------------------------------
+# Using TITLE as the test group title, check the generated parser tables
+# and parser for a specified grammar file under a condition labeled by
+# COND-VALUE.
+#
+# TEST-SPEC is a comma-delimited list of attributes of this test.  Each
+# recognized attribute is described below where it is relevant.
+#
+# Insert DECLS and GRAMMAR into the declarations and grammar section of
+# the grammar file.  Insert basic yyerror, yylex, and main function
+# definitions as well.  Hardcode yylex to return the (possibly empty)
+# comma-delimited series of tokens in INPUT followed by token 0.
+#
+# If TEST-SPEC contains the attribute no-xml, then invoke bison using
+# AT_BISON_CHECK_NO_XML.  Otherwise, invoke bison using AT_BISON_CHECK.
+# On the bison command-line, specify `--report=all --defines'.  Check
+# that Bison exits with value 0, has no stdout, and has stderr
+# BISON-STDERR.
+#
+# If TEST-SPEC contains the attribute `last-state', check that the value
+# of TABLES-OR-LAST-STATE is the index of the last state generated for
+# the grammar; in other words, check the number of states (minus one).
+# Otherwise, check that everything in the `.output' file starting with
+# the definition of state 0 is the same as the entire value of
+# TABLES-OR-LAST-STATE.
+#
+# Expand the M4 in OTHER-CHECKS to perform additional checks of the
+# `.output' file, which is named `input.output', and/or grammar file,
+# which is named `input.y'.
+#
+# Finally, compile the generated parser and then run it using
+# AT_PARSER_CHECK with PARSER-EXIT-VALUE, PARSER-STDOUT, and
+# PARSER-STDERR as the 2nd-4th arguments.
+#
+# As a precondition, you must properly double-quote all arguments that
+# are to be interpreted as strings.
+#
+# AT_COND_CASE (when appearing in single-quoted segments of arguments)
+# invokes m4_case with its own arguments but COND-VALUE inserted as the
+# first argument.  This is useful, for example, when wrapping multiple
+# AT_TEST_TABLES_AND_PARSE invocations, each representing a different
+# condition, in another macro.
+#
+# For example:
+#
+#   # AT_TEST_SYNTAX_ERROR(DESCRIPTION, DECLS, GRAMMAR, INPUT, LAST-STATE,
+#   #                      PARSER-EXIT-VALUE, PARSER-STDOUT, PARSER-STDERR)
+#   # ---------------------------------------------------------------------
+#   m4_define([AT_TEST_SYNTAX_ERROR],
+#   [
+#     AT_TEST_TABLES_AND_PARSE([$1[ with %error-verbose]], [[verbose]],
+#                              [[last-state]],
+#                              [[%error-verbose ]$2], [$3], [$4],
+#                              [[]], [$5], [], [$6], [$7], [$8])
+#     AT_TEST_TABLES_AND_PARSE([$1[ with no %error-verbose]], [[no verbose]],
+#                              [[last-state]],
+#                              [$2], [$3], [$4],
+#                              [[]], [$5], [], [$6], [$7], [$8])
+#   ])
+#
+#   AT_TEST_SYNTAX_ERROR([[Single Char Grammar]],
+#                        [[%token 'b']], [[start: 'a' ;]], [['a', 'b']],
+#                        [[3]],
+#                        [[1]], [[]],
+#                        [AT_COND_CASE([[no verbose]],
+#                                      [[syntax error
+#   ]],
+#                                      [[syntax error, unexpected 'b', expecting $end
+#   ]])])
+m4_define([AT_TEST_TABLES_AND_PARSE],
+[m4_pushdef([AT_COND_CASE], [m4_case([$2], $][@)])
+
+AT_SETUP([$1])
+
+AT_DATA_GRAMMAR([[input.y]],
+[[%code {
+  #include <stdio.h>
+  static void yyerror (char const *msg);
+  static int yylex (void);
+}
+
+]$4[
+
+%%
+
+]$5[
+
+%%
+
+static void
+yyerror (char const *msg)
+{
+  fprintf (stderr, "%s\n", msg);
+}
+
+static int
+yylex (void)
+{
+  static int const input[] = {
+    ]m4_if([$6], [], [], [$6], [[]], [], [$6[, ]])[0
+  };
+  static int const *inputp = input;
+  return *inputp++;
+}
+
+int
+main (void)
+{
+  return yyparse ();
+}
+]])
+
+# In some versions of Autoconf, AT_CHECK invokes AS_ESCAPE before
+# expanding macros, so it corrupts some special characters in the
+# macros.  To avoid this, expand now and pass it the result with proper
+# string quotation.  Assume args 7 thru 12 expand to properly quoted
+# strings.
+
+m4_if(m4_index(m4_quote($3), [no-xml]), -1,
+      [AT_BISON_CHECK],
+      [AT_BISON_CHECK_NO_XML])([[--report=all --defines -o input.c input.y]],
+                               [0], [], m4_dquote($7))
+
+m4_if(m4_index(m4_quote($3), [last-state]), -1,
+      [AT_CHECK([[sed -n '/^state 0$/,$p' input.output]], [[0]],
+                m4_dquote($8))],
+      [AT_CHECK([[sed -n 's/^state //p' input.output | tail -1]], [[0]],
+                m4_dquote($8)[[
+]])])
+
+$9
+
+# Canonical LR generates very large tables, resulting in very long
+# files with #line directives that may overflow what the standards
+# (C90 and C++98) guarantee: 32767.  In that case, GCC's -pedantic
+# will issue an error.
+#
+# There is no "" around `wc` since some indent the result.
+m4_bmatch([$4], [%define lr.type canonical-lr],
+[if test 32767 -lt `wc -l < input.c`; then
+  CFLAGS=`echo " $CFLAGS " | sed -e 's/ -pedantic //'`
+  CXXFLAGS=`echo " $CXXFLAGS " | sed -e 's/ -pedantic //'`
+fi])
+AT_COMPILE([[input]])
+
+AT_PARSER_CHECK([[./input]],
+                m4_ifval([$10], [m4_dquote($10)]),
+                m4_ifval([$11], [m4_dquote($11)]),
+                m4_ifval([$12], [m4_dquote($12)]))
+
+AT_CLEANUP
+
+m4_popdef([AT_COND_CASE])])
 
 
 
@@ -321,4 +645,15 @@ m4_define([AT_PARSER_CHECK],
 
 AT_INIT
 
+# Cannot assign CC and CFLAGS here, since atlocal is loaded after
+# options are processed, so we don't know the value of CXX and
+# CXXFLAGS yet.
+#
+# Note that it also means that command line values for CXX and
+# CXXFLAGS will not be propagated to CC and CFLAGS.
+AT_ARG_OPTION([compile-c-with-cxx],
+              [compile C parsers with the C++ compiler])
+
+AT_COLOR_TESTS
+
 AT_TESTED([bison])