grammar: free the association tracking graph

[bison.git] / tests / local.at

diff --git a/tests/local.at b/tests/local.at
index 121dedf2c2614a5b641d27ac435a689db92220b2..c1aedf39bb93d8a8679e455dd0f6a2d4c5267254 100644 (file)
--- a/tests/local.at
+++ b/tests/local.at
@@ -2,7 +2,7 @@
 
 # Macros for the GNU Bison Test suite.
 
 
 # Macros for the GNU Bison Test suite.
 

-# Copyright (C) 2003-2012 Free Software Foundation, Inc.
+# Copyright (C) 2003-2013 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
 
 # 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


@@ -29,6 +29,23 @@ m4_define([m4_null_if],
          [],  [$2],
          [$3])])
 
          [],  [$2],
          [$3])])
 

+# AT_SETUP_STRIP(TITLE)
+# ---------------------
+# Abbreviate the TITLE to be passed to AT_SETUP.  Remove new-lines
+# that completely break AT_SETUP.
+m4_define([AT_SETUP_STRIP],
+[m4_bpatsubsts([$1],
+      [%\(language\|skeleton\) "?\([^\" ]*\)"?],
+        [\2],
+      [%define "?\([-A-Za-z0-9_.]+\)"? \("[^\"]+"\|[-A-Za-z0-9_.]+\)],
+        [\1=\2],
+      [%define "?\([-A-Za-z0-9_.]+\)"?],
+        [\1],
+      [ *
++ *],    [ ])dnl
+])
+
+

 ## ------------- ##
 ## Basic tests.  ##
 ## ------------- ##
 ## ------------- ##
 ## Basic tests.  ##
 ## ------------- ##


@@ -80,21 +97,30 @@ m4_define([AT_RESTORE_SPECIAL_FILES], [at_restore_special_files])
 
 # AT_LOC_PUSHDEF(FIRST-LINE, FIRST-COLUMN, LAST-LINE, LAST-COLUMN)
 # ----------------------------------------------------------------
 
 # AT_LOC_PUSHDEF(FIRST-LINE, FIRST-COLUMN, LAST-LINE, LAST-COLUMN)
 # ----------------------------------------------------------------

-# Pushdef AT_LOC_(FIRST|LAST)_(LINE|COLUMN).
+# Pushdef AT(_LOC)?_(FIRST|LAST)_(LINE|COLUMN).

 m4_define([AT_LOC_PUSHDEF],
 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])])
+[m4_pushdef([AT_FIRST_LINE],  [$1])
+m4_pushdef([AT_FIRST_COLUMN], [$2])
+m4_pushdef([AT_LAST_LINE],    [$3])
+m4_pushdef([AT_LAST_COLUMN],  [$4])
+m4_pushdef([AT_LOC_FIRST_LINE],   [AT_LOC.AT_FIRST_LINE])
+m4_pushdef([AT_LOC_FIRST_COLUMN], [AT_LOC.AT_FIRST_COLUMN])
+m4_pushdef([AT_LOC_LAST_LINE],    [AT_LOC.AT_LAST_LINE])
+m4_pushdef([AT_LOC_LAST_COLUMN],  [AT_LOC.AT_LAST_COLUMN])])

 
 # AT_LOC_POPDEF
 # -------------
 
 # AT_LOC_POPDEF
 # -------------

-# Popdef AT_LOC_(FIRST|LAST)_(LINE|COL).
+# Popdef AT(_LOC)?_(FIRST|LAST)_(LINE|COLUMN).

 m4_define([AT_LOC_POPDEF],
 [m4_popdef([AT_LOC_FIRST_LINE])
 m4_popdef([AT_LOC_FIRST_COLUMN])
 m4_popdef([AT_LOC_LAST_LINE])
 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])])
+m4_popdef([AT_LOC_LAST_COLUMN])
+m4_popdef([AT_FIRST_LINE])
+m4_popdef([AT_FIRST_COLUMN])
+m4_popdef([AT_LAST_LINE])
+m4_popdef([AT_LAST_COLUMN])
+])

 
 
 
 
 
 


@@ -115,6 +141,8 @@ m4_define([_AT_BISON_OPTION_PUSHDEFS],
        [m4_fatal([$0: Invalid arguments: $@])])dnl
 m4_pushdef([AT_DEFINES_IF],
 [m4_bmatch([$3], [%defines], [$1], [$2])])
        [m4_fatal([$0: Invalid arguments: $@])])dnl
 m4_pushdef([AT_DEFINES_IF],
 [m4_bmatch([$3], [%defines], [$1], [$2])])

+m4_pushdef([AT_DEBUG_IF],
+[m4_bmatch([$3], [%debug\|%define parse.trace], [$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_pushdef([AT_SKEL_CC_IF],
 [m4_bmatch([$3], [%language "[Cc]\+\+"\|%skeleton "[a-z0-9]+\.cc"], [$1], [$2])])
 m4_pushdef([AT_SKEL_JAVA_IF],


@@ -152,15 +180,18 @@ m4_pushdef([AT_PURE_IF],
 [m4_bmatch([$3], [%define  *api\.pure\|%pure-parser],
            [m4_bmatch([$3], [%define  *api\.pure *"?false"?], [$2], [$1])],
            [$2])])
 [m4_bmatch([$3], [%define  *api\.pure\|%pure-parser],
            [m4_bmatch([$3], [%define  *api\.pure *"?false"?], [$2], [$1])],
            [$2])])

+# AT_NAME_PREFIX: also consider api.namespace.

 m4_pushdef([AT_NAME_PREFIX],
 m4_pushdef([AT_NAME_PREFIX],

-[m4_bmatch([$3], [\(%define api\.prefix\|%name-prefix\) ".*"],
-           [m4_bregexp([$3], [\(%define api\.prefix\|%name-prefix\) "\([^""]*\)"], [\2])],
+[m4_bmatch([$3], [\(%define api\.\(namespace\|prefix\)\|%name-prefix\) ".*"],
+           [m4_bregexp([$3], [\(%define api\.\(namespace\|prefix\)\|%name-prefix\) "\([^""]*\)"], [\3])],

            [yy])])
 m4_pushdef([AT_TOKEN_CTOR_IF],
            [yy])])
 m4_pushdef([AT_TOKEN_CTOR_IF],

-[m4_bmatch([$3], [%define api.token.constructor], [$1], [$2])])
+[m4_bmatch([$3], [%define api\.token\.constructor], [$1], [$2])])

 m4_pushdef([AT_TOKEN_PREFIX],
 m4_pushdef([AT_TOKEN_PREFIX],

-[m4_bmatch([$3], [%define api.token.prefix ".*"],
-           [m4_bregexp([$3], [%define api.token.prefix "\(.*\)"], [\1])])])
+[m4_bmatch([$3], [%define api\.token\.prefix ".*"],
+           [m4_bregexp([$3], [%define api\.token\.prefix "\(.*\)"], [\1])])])
+m4_pushdef([AT_VARIANT_IF],
+[m4_bmatch([$3], [%define api\.value\.type "?variant"?], [$1], [$2])])

 m4_pushdef([AT_API_prefix],
 [m4_bmatch([$3], [%define api\.prefix ".*"],
            [m4_bregexp([$3], [%define api\.prefix "\([^""]*\)"], [\1])],
 m4_pushdef([AT_API_prefix],
 [m4_bmatch([$3], [%define api\.prefix ".*"],
            [m4_bregexp([$3], [%define api\.prefix "\([^""]*\)"], [\1])],


@@ -174,7 +205,7 @@ m4_pushdef([AT_API_PREFIX],
 m4_pushdef([AT_YYERROR_ARG_LOC_IF],
 [AT_LOCATION_IF([AT_PURE_IF([m4_bmatch([$3],
                                        m4_quote(m4_join([\|],
 m4_pushdef([AT_YYERROR_ARG_LOC_IF],
 [AT_LOCATION_IF([AT_PURE_IF([m4_bmatch([$3],
                                        m4_quote(m4_join([\|],

-                                                        [%define api.pure "?full"?],
+                                                        [%define api\.pure "?full"?],

                                                         [%glr-parser],
                                                         [%parse-param],
                                                         [%skeleton "?glr.c"?])),
                                                         [%glr-parser],
                                                         [%parse-param],
                                                         [%skeleton "?glr.c"?])),


@@ -259,6 +290,7 @@ m4_popdef([AT_YYERROR_SEES_LOC_IF])
 m4_popdef([AT_YYERROR_ARG_LOC_IF])
 m4_popdef([AT_API_PREFIX])
 m4_popdef([AT_API_prefix])
 m4_popdef([AT_YYERROR_ARG_LOC_IF])
 m4_popdef([AT_API_PREFIX])
 m4_popdef([AT_API_prefix])

+m4_popdef([AT_VARIANT_IF])

 m4_popdef([AT_TOKEN_PREFIX])
 m4_popdef([AT_TOKEN_CTOR_IF])
 m4_popdef([AT_NAME_PREFIX])
 m4_popdef([AT_TOKEN_PREFIX])
 m4_popdef([AT_TOKEN_CTOR_IF])
 m4_popdef([AT_NAME_PREFIX])


@@ -275,6 +307,7 @@ m4_popdef([AT_SKEL_JAVA_IF])
 m4_popdef([AT_GLR_CC_IF])
 m4_popdef([AT_LALR1_CC_IF])
 m4_popdef([AT_DEFINES_IF])
 m4_popdef([AT_GLR_CC_IF])
 m4_popdef([AT_LALR1_CC_IF])
 m4_popdef([AT_DEFINES_IF])

+m4_popdef([AT_DEBUG_IF])

 AT_LOC_POPDEF])dnl
 ])# AT_BISON_OPTION_POPDEFS
 
 AT_LOC_POPDEF])dnl
 ])# AT_BISON_OPTION_POPDEFS
 


@@ -390,12 +423,51 @@ m4_define([AT_YYERROR_DECLARE_EXTERN],
 
 m4_define([AT_YYERROR_DECLARE],
 [m4_case(AT_LANG,
 
 m4_define([AT_YYERROR_DECLARE],
 [m4_case(AT_LANG,

-[c], [static AT_YYERROR_DECLARE_EXTERN])[]dnl
+[c], [#include <stdio.h>
+]AT_LOCATION_IF([[
+#if defined ]AT_YYLTYPE[_IS_TRIVIAL && ]AT_YYLTYPE[_IS_TRIVIAL
+static unsigned location_print (FILE *yyo, ]AT_YYLTYPE[ const * const yylocp);
+# ifndef LOCATION_PRINT
+#  define LOCATION_PRINT(File, Loc) location_print (File, &(Loc))
+# endif
+#endif
+]])[
+static AT_YYERROR_DECLARE_EXTERN])[]dnl

 ])
 
 m4_define([AT_YYERROR_DEFINE],
 [m4_case(AT_LANG,
 ])
 
 m4_define([AT_YYERROR_DEFINE],
 [m4_case(AT_LANG,

-[c], [[#include <stdio.h>
+[c], [[
+]AT_LOCATION_IF([[
+# if defined ]AT_YYLTYPE[_IS_TRIVIAL && ]AT_YYLTYPE[_IS_TRIVIAL
+/* Print *YYLOCP on YYO. */
+__attribute__((__unused__))
+static unsigned
+location_print (FILE *yyo, ]AT_YYLTYPE[ const * const yylocp)
+{
+  unsigned res = 0;
+  int end_col = 0 != yylocp->last_column ? yylocp->last_column - 1 : 0;
+  if (0 <= yylocp->first_line)
+    {
+      res += fprintf (yyo, "%d", yylocp->first_line);
+      if (0 <= yylocp->first_column)
+        res += fprintf (yyo, ".%d", yylocp->first_column);
+    }
+  if (0 <= yylocp->last_line)
+    {
+      if (yylocp->first_line < yylocp->last_line)
+        {
+          res += fprintf (yyo, "-%d", yylocp->last_line);
+          if (0 <= end_col)
+            res += fprintf (yyo, ".%d", end_col);
+        }
+      else if (0 <= end_col && yylocp->first_column < end_col)
+        res += fprintf (yyo, "-%d", end_col);
+    }
+  return res;
+}
+#endif
+]])[

 /* A C error reporting function.  */
 static
 ]AT_YYERROR_PROTOTYPE[
 /* A C error reporting function.  */
 static
 ]AT_YYERROR_PROTOTYPE[


@@ -403,14 +475,15 @@ static
               [[^,]+[^A-Za-z_0-9]\([A-Za-z_][A-Za-z_0-9]*\), *], [
   YYUSE(\1);])dnl
 AT_YYERROR_SEES_LOC_IF([[
               [[^,]+[^A-Za-z_0-9]\([A-Za-z_][A-Za-z_0-9]*\), *], [
   YYUSE(\1);])dnl
 AT_YYERROR_SEES_LOC_IF([[

-  YY_LOCATION_PRINT (stderr, ]AT_LOC[);
+  LOCATION_PRINT (stderr, ]AT_LOC[);

   fprintf (stderr, ": ");]])[
   fprintf (stderr, "%s\n", msg);
 }]],
 [c++], [[/* A C++ error reporting function.  */
 void
 ]AT_NAME_PREFIX[::parser::error (]AT_LOCATION_IF([[const location_type& l, ]])[const std::string& m)
   fprintf (stderr, ": ");]])[
   fprintf (stderr, "%s\n", msg);
 }]],
 [c++], [[/* A C++ error reporting function.  */
 void
 ]AT_NAME_PREFIX[::parser::error (]AT_LOCATION_IF([[const location_type& l, ]])[const std::string& m)

-{  std::cerr << ]AT_LOCATION_IF([l << ": " << ])[m << std::endl;
+{
+  std::cerr << ]AT_LOCATION_IF([l << ": " << ])[m << std::endl;

 }]],
 [java], [AT_LOCATION_IF([[public void yyerror (Calc.Location l, String s)
 {
 }]],
 [java], [AT_LOCATION_IF([[public void yyerror (Calc.Location l, String s)
 {


@@ -428,6 +501,50 @@ void
 ])
 
 
 ])
 
 

+# AT_MAIN_DEFINE
+# --------------
+m4_define([AT_MAIN_DEFINE],
+[m4_case(AT_LANG,
+[c],
+[[#include <stdlib.h> /* getenv. */
+#include <string.h> /* strcmp. */
+int
+main (int argc, char const* argv[])
+{]AT_DEBUG_IF([[
+  if (getenv("YYDEBUG")
+      || (argc == 2
+          && (!strcmp (argv[1], "-d") || !strcmp (argv[1], "--debug"))))
+    yydebug |= 1;]], [[
+  (void) argc;
+  (void) argv;]])[
+  return ]AT_NAME_PREFIX[parse ();
+}]],
+[c++],
+[[#include <cstdlib> // getenv.
+#include <cstring> // strcmp.
+int
+main (int argc, char const* argv[])
+{
+  ]AT_NAME_PREFIX[::parser p;]AT_DEBUG_IF([[
+  if (getenv("YYDEBUG")
+      || (argc == 2
+          && (!strcmp (argv[1], "-d") || !strcmp (argv[1], "--debug"))))
+    p.set_debug_level (true);]], [[
+  (void) argc;
+  (void) argv;]])[
+  return p.parse ();
+}]],
+[java],
+[[class input
+{
+  public static void main (String args[]) throws IOException
+  {
+    YYParser p = new YYParser ();
+    p.parse ();
+  }
+}]])])
+
+

 ## --------------- ##
 ## Running Bison.  ##
 ## --------------- ##
 ## --------------- ##
 ## Running Bison.  ##
 ## --------------- ##


@@ -464,7 +581,7 @@ AT_BISON_CHECK_NO_XML($@)])
 # --------------------------------------------------
 # Low-level macro to run bison once.
 m4_define([AT_BISON_CHECK_],
 # --------------------------------------------------
 # Low-level macro to run bison once.
 m4_define([AT_BISON_CHECK_],

-[AT_CHECK(AT_QUELL_VALGRIND[[ bison ]]$@)])
+[AT_CHECK(AT_QUELL_VALGRIND[[ bison -fno-caret ]]$@)])

 
 
 # AT_BISON_CHECK_WARNINGS(BISON_ARGS, [OTHER_AT_CHECK_ARGS])
 
 
 # AT_BISON_CHECK_WARNINGS(BISON_ARGS, [OTHER_AT_CHECK_ARGS])


@@ -515,7 +632,7 @@ fi]dnl
 # when a tortured grammar's XML is known to be too large for xsltproc to
 # handle.
 m4_define([AT_BISON_CHECK_NO_XML],
 # when a tortured grammar's XML is known to be too large for xsltproc to
 # handle.
 m4_define([AT_BISON_CHECK_NO_XML],

-[AT_CHECK(m4_null_if([$2], [], [AT_QUELL_VALGRIND ])[[bison ]]$@)
+[AT_CHECK(m4_null_if([$2], [], [AT_QUELL_VALGRIND ])[[bison -fno-caret ]]$@)

 AT_BISON_CHECK_WARNINGS($@)])
 
 # AT_BISON_CHECK_XML(BISON_ARGS, [OTHER_AT_CHECK_ARGS])
 AT_BISON_CHECK_WARNINGS($@)])
 
 # AT_BISON_CHECK_XML(BISON_ARGS, [OTHER_AT_CHECK_ARGS])


@@ -581,9 +698,7 @@ m4_define([AT_QUELL_VALGRIND],
 # otherwise pass "-c"; this is a hack.  The default SOURCES is OUTPUT
 # with trailing .o removed, and ".c" appended.
 m4_define([AT_COMPILE],
 # otherwise pass "-c"; this is a hack.  The default SOURCES is OUTPUT
 # with trailing .o removed, and ".c" appended.
 m4_define([AT_COMPILE],

-[AT_CHECK([case $POSIXLY_CORRECT_IS_EXPORTED:$C_COMPILER_POSIXLY_CORRECT in
-  true:false) echo 'cannot compile properly with POSIXLY_CORRECT' && exit 77;;
-esac])
+[AT_CHECK([$BISON_C_WORKS], 0, ignore, ignore)

 AT_CHECK(m4_join([ ],
                   [$CC $CFLAGS $CPPFLAGS],
                   [m4_bmatch([$1], [[.]], [-c], [$LDFLAGS])],
 AT_CHECK(m4_join([ ],
                   [$CC $CFLAGS $CPPFLAGS],
                   [m4_bmatch([$1], [[.]], [-c], [$LDFLAGS])],


@@ -649,23 +764,23 @@ m4_define([AT_FULL_COMPILE],
 [java],
   [AT_BISON_CHECK([-o $1.java $1.y])
    AT_LANG_COMPILE([$1],
 [java],
   [AT_BISON_CHECK([-o $1.java $1.y])
    AT_LANG_COMPILE([$1],

-                    m4_join([ ],
-                            [$1.java],
-                            m4_ifval($2, [[$1-$2.java]]),
+                   m4_join([ ],
+                           [$1.java],
+                           m4_ifval($2, [[$1-$2.java]]),

                            m4_ifval($3, [[$1-$3.java]])))],
 [c++],
   [AT_BISON_CHECK([-o $1.cc $1.y])
    AT_LANG_COMPILE([$1],
                            m4_ifval($3, [[$1-$3.java]])))],
 [c++],
   [AT_BISON_CHECK([-o $1.cc $1.y])
    AT_LANG_COMPILE([$1],

-                     m4_join([ ],
-                             [$1.cc],
-                             m4_ifval($2, [[$1-$2.cc]]),
+                   m4_join([ ],
+                           [$1.cc],
+                           m4_ifval($2, [[$1-$2.cc]]),

                            m4_ifval($3, [[$1-$3.cc]])))],
 [c],
   [AT_BISON_CHECK([-o $1.c $1.y])
    AT_LANG_COMPILE([$1],
                            m4_ifval($3, [[$1-$3.cc]])))],
 [c],
   [AT_BISON_CHECK([-o $1.c $1.y])
    AT_LANG_COMPILE([$1],

-                  m4_join([ ],
-                          [$1.c],
-                          m4_ifval($2, [[$1-$2.c]]),
+                   m4_join([ ],
+                           [$1.c],
+                           m4_ifval($2, [[$1-$2.c]]),

                            m4_ifval($3, [[$1-$3.c]])))])
 ])
 
                            m4_ifval($3, [[$1-$3.c]])))])
 ])
 


@@ -814,7 +929,6 @@ AT_SETUP([$1])
 AT_BISON_OPTION_PUSHDEFS([$4])
 AT_DATA_GRAMMAR([[input.y]],
 [[%code {
 AT_BISON_OPTION_PUSHDEFS([$4])
 AT_DATA_GRAMMAR([[input.y]],
 [[%code {

-  #include <stdio.h>

   ]AT_YYERROR_DECLARE[
   ]AT_YYLEX_DECLARE[
 }
   ]AT_YYERROR_DECLARE[
   ]AT_YYLEX_DECLARE[
 }


@@ -837,11 +951,7 @@ yylex (void)
   return *inputp++;
 }
 
   return *inputp++;
 }
 

-int
-main (void)
-{
-  return yyparse ();
-}
+]AT_MAIN_DEFINE[

 ]])
 
 # In some versions of Autoconf, AT_CHECK invokes AS_ESCAPE before
 ]])
 
 # In some versions of Autoconf, AT_CHECK invokes AS_ESCAPE before


@@ -852,7 +962,7 @@ main (void)
 
 m4_if(m4_index(m4_quote($3), [no-xml]), -1,
       [AT_BISON_CHECK],
 
 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]],
+      [AT_BISON_CHECK_NO_XML])([[-Wall --report=all --defines -o input.c input.y]],

                                [0], [], m4_dquote($7))
 
 m4_if(m4_index(m4_quote($3), [last-state]), -1,
                                [0], [], m4_dquote($7))
 
 m4_if(m4_index(m4_quote($3), [last-state]), -1,


@@ -872,8 +982,8 @@ $9
 # 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
 # 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 //'`
+  CFLAGS=`echo " $CFLAGS " | sed -e 's/ -pedantic / /'`
+  CXXFLAGS=`echo " $CXXFLAGS " | sed -e 's/ -pedantic / /'`

 fi])
 AT_COMPILE([[input]])
 
 fi])
 AT_COMPILE([[input]])
 


@@ -889,12 +999,20 @@ m4_popdef([AT_COND_CASE])])
 
 
 
 
 
 

+

 ## ----------------------- ##
 ## Launch the test suite.  ##
 ## ----------------------- ##
 
 AT_INIT
 
 ## ----------------------- ##
 ## Launch the test suite.  ##
 ## ----------------------- ##
 
 AT_INIT
 

+# AT_SETUP([TITLE])
+# -----------------
+# Redefine AT_SETUP to be more concise.  Must be done after AT_INIT.
+m4_copy_force([AT_SETUP], [B4_SETUP])
+m4_define([AT_SETUP],
+[B4_SETUP(m4_expand([AT_SETUP_STRIP([[$1]])]))])
+

 # 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.
 # 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.