c++: silence warnings

[bison.git] / tests / local.at

diff --git a/tests/local.at b/tests/local.at
index ac266daacdb31c7e19455ce72723a7ed51cdc1e0..aa14ced811dc68c10a2f74ea96058a183caa2065 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 +29,20 @@ m4_define([m4_null_if],
          [],  [$2],
          [$3])])
 
          [],  [$2],
          [$3])])
 

+# AT_SETUP_STRIP(TITLE)
+# ---------------------
+# Abbreviate the TITLE to be passed to AT_SETUP.
+m4_define([AT_SETUP_STRIP],
+[m4_bpatsubsts([$1],
+      [%\(language\|skeleton\) "?\([^\" ]*\)"?],
+        [\2],
+      [%define "?\([-A-Za-z0-9_.]+\)"? \("\([^\" ]+\)"\|\([-A-Za-z0-9_.]+\)\)],
+        [\1=\3\4],
+      [%define "?\([-A-Za-z0-9_.]+\)"?],
+        [\1])dnl
+])
+
+

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


@@ -119,6 +133,7 @@ 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_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])])

+# The target language: "c", "c++", or "java".

 m4_pushdef([AT_LANG],
 [AT_SKEL_JAVA_IF([java],
                  [AT_SKEL_CC_IF([c++],
 m4_pushdef([AT_LANG],
 [AT_SKEL_JAVA_IF([java],
                  [AT_SKEL_CC_IF([c++],


@@ -140,18 +155,23 @@ m4_pushdef([AT_LOCATION_TYPE_IF],
 [m4_bmatch([$3], [%define \(api\.location\.type\|location_type\)], [$1], [$2])])
 m4_pushdef([AT_PARAM_IF],
 [m4_bmatch([$3], [%parse-param], [$1], [$2])])
 [m4_bmatch([$3], [%define \(api\.location\.type\|location_type\)], [$1], [$2])])
 m4_pushdef([AT_PARAM_IF],
 [m4_bmatch([$3], [%parse-param], [$1], [$2])])

+# Comma-terminated list of formals parse-parameters.
+# E.g., %parse-param { int x } %parse-param {int y} -> "int x, int y, ".
+# FIXME: Support grouped parse-param.
+m4_pushdef([AT_PARSE_PARAMS])
+m4_bpatsubst([$3], [%parse-param { *\([^{}]*[^{} ]\) *}],
+             [m4_append([AT_PARSE_PARAMS], [\1, ])])
+

 m4_pushdef([AT_PURE_IF],
 [m4_bmatch([$3], [%define  *api\.pure\|%pure-parser],
            [m4_bmatch([$3], [%define  *api\.pure *"?false"?], [$2], [$1])],
            [$2])])
 m4_pushdef([AT_PURE_IF],
 [m4_bmatch([$3], [%define  *api\.pure\|%pure-parser],
            [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])])
-m4_pushdef([AT_GLR_OR_PARAM_IF],
-[m4_bmatch([$3], [%glr-parser\|%parse-param], [$1], [$2])])

 m4_pushdef([AT_NAME_PREFIX],
 [m4_bmatch([$3], [\(%define api\.prefix\|%name-prefix\) ".*"],
            [m4_bregexp([$3], [\(%define api\.prefix\|%name-prefix\) "\([^""]*\)"], [\2])],
            [yy])])
 m4_pushdef([AT_NAME_PREFIX],
 [m4_bmatch([$3], [\(%define api\.prefix\|%name-prefix\) ".*"],
            [m4_bregexp([$3], [\(%define api\.prefix\|%name-prefix\) "\([^""]*\)"], [\2])],
            [yy])])

+m4_pushdef([AT_TOKEN_CTOR_IF],
+[m4_bmatch([$3], [%define api.token.constructor], [$1], [$2])])

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


@@ -161,14 +181,26 @@ m4_pushdef([AT_API_prefix],
            [yy])])
 m4_pushdef([AT_API_PREFIX],
 [m4_toupper(AT_API_prefix)])
            [yy])])
 m4_pushdef([AT_API_PREFIX],
 [m4_toupper(AT_API_prefix)])

-# yyerror receives the location if %location & %pure & (%glr or %parse-param).
+# yyerror receives the location if %location, and if the parser is pure. For
+# historical reasons, with the "yacc.c" skeleton, the location is not passed
+# unless an additional "%parse-param" is present, or if the purity is defined
+# as "full".

 m4_pushdef([AT_YYERROR_ARG_LOC_IF],
 m4_pushdef([AT_YYERROR_ARG_LOC_IF],

-[AT_GLR_OR_PARAM_IF([AT_PURE_AND_LOC_IF([$1], [$2])],
+[AT_LOCATION_IF([AT_PURE_IF([m4_bmatch([$3],
+                                       m4_quote(m4_join([\|],
+                                                        [%define api.pure "?full"?],
+                                                        [%glr-parser],
+                                                        [%parse-param],
+                                                        [%skeleton "?glr.c"?])),
+                                       [$1], [$2])],
+                            [$2])],

                     [$2])])
                     [$2])])

-# yyerror always sees the locations (when activated), except if
-# (yacc & pure & !param).  FIXME: This is wrong.  See the manual.
+
+# yyerror always sees the locations (when activated) if the parser is impure.
+# When the parser is pure, yyerror sees the location if it is received as an
+# argument.

 m4_pushdef([AT_YYERROR_SEES_LOC_IF],
 m4_pushdef([AT_YYERROR_SEES_LOC_IF],

-[AT_LOCATION_IF([AT_YACC_IF([AT_PURE_IF([AT_PARAM_IF([$1], [$2])],
+[AT_LOCATION_IF([AT_YACC_IF([AT_PURE_IF([AT_YYERROR_ARG_LOC_IF([$1], [$2])],

                                         [$1])],
                             [$1])],
                 [$2])])
                                         [$1])],
                             [$1])],
                 [$2])])


@@ -241,11 +273,12 @@ 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_TOKEN_PREFIX])
+m4_popdef([AT_TOKEN_CTOR_IF])

 m4_popdef([AT_NAME_PREFIX])
 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_LOCATION_TYPE_IF])
 m4_popdef([AT_LOCATION_IF])

+m4_popdef([AT_PARSE_PARAMS])

 m4_popdef([AT_PARAM_IF])
 m4_popdef([AT_LEXPARAM_IF])
 m4_popdef([AT_YACC_IF])
 m4_popdef([AT_PARAM_IF])
 m4_popdef([AT_LEXPARAM_IF])
 m4_popdef([AT_YACC_IF])


@@ -347,6 +380,7 @@ static
 }]dnl
 ])
 
 }]dnl
 ])
 

+# AT_YYERROR_FORMALS

 # AT_YYERROR_PROTOTYPE
 # AT_YYERROR_DECLARE_EXTERN
 # AT_YYERROR_DECLARE
 # AT_YYERROR_PROTOTYPE
 # AT_YYERROR_DECLARE_EXTERN
 # AT_YYERROR_DECLARE


@@ -355,7 +389,7 @@ static
 # Must be called inside a AT_BISON_OPTION_PUSHDEFS/POPDEFS pair.
 m4_define([AT_YYERROR_FORMALS],
 [m4_case(AT_LANG,
 # Must be called inside a AT_BISON_OPTION_PUSHDEFS/POPDEFS pair.
 m4_define([AT_YYERROR_FORMALS],
 [m4_case(AT_LANG,

-[c], [AT_YYERROR_ARG_LOC_IF([AT_YYLTYPE *llocp, ])[const char *msg]])[]dnl
+[c], [AT_YYERROR_ARG_LOC_IF([AT_YYLTYPE const * const llocp, ])AT_PARSE_PARAMS [const char *msg]])[]dnl

 ])
 
 m4_define([AT_YYERROR_PROTOTYPE],
 ])
 
 m4_define([AT_YYERROR_PROTOTYPE],


@@ -379,16 +413,11 @@ m4_define([AT_YYERROR_DEFINE],
 /* A C error reporting function.  */
 static
 ]AT_YYERROR_PROTOTYPE[
 /* A C error reporting function.  */
 static
 ]AT_YYERROR_PROTOTYPE[

-{
-]AT_YYERROR_SEES_LOC_IF([[
-  fprintf (stderr, "%d.%d",
-           ]AT_LOC_FIRST_LINE[, ]AT_LOC_FIRST_COLUMN[);
-  if (]AT_LOC_FIRST_LINE[ != ]AT_LOC_LAST_LINE[)
-    fprintf (stderr, "-%d.%d",
-             ]AT_LOC_LAST_LINE[,  ]AT_LOC_LAST_COLUMN[ - 1);
-  else if (]AT_LOC_FIRST_COLUMN[ != ]AT_LOC_LAST_COLUMN[ - 1)
-    fprintf (stderr, "-%d",
-             ]AT_LOC_LAST_COLUMN[ - 1);
+{]m4_bpatsubst(m4_defn([AT_PARSE_PARAMS]),
+              [[^,]+[^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[);

   fprintf (stderr, ": ");]])[
   fprintf (stderr, "%s\n", msg);
 }]],
   fprintf (stderr, ": ");]])[
   fprintf (stderr, "%s\n", msg);
 }]],


@@ -445,15 +474,11 @@ m4_define([AT_BISON_CHECK],
 [m4_null_if([$2], [AT_BISON_CHECK_XML($@)])
 AT_BISON_CHECK_NO_XML($@)])
 
 [m4_null_if([$2], [AT_BISON_CHECK_XML($@)])
 AT_BISON_CHECK_NO_XML($@)])
 

-m4_define([AT_BISON_WERROR_MSG],
-          [[bison: warnings being treated as errors]])
-
-

 # AT_BISON_CHECK_(BISON_ARGS, [OTHER_AT_CHECK_ARGS])
 # --------------------------------------------------
 # Low-level macro to run bison once.
 m4_define([AT_BISON_CHECK_],
 # AT_BISON_CHECK_(BISON_ARGS, [OTHER_AT_CHECK_ARGS])
 # --------------------------------------------------
 # 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])


@@ -465,59 +490,36 @@ m4_define([AT_BISON_CHECK_WARNINGS],
       [m4_null_if([$2], [AT_BISON_CHECK_WARNINGS_($@)])])])
 
 m4_define([AT_BISON_CHECK_WARNINGS_],
       [m4_null_if([$2], [AT_BISON_CHECK_WARNINGS_($@)])])])
 
 m4_define([AT_BISON_CHECK_WARNINGS_],

-[[# 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 "${POSIXLY_CORRECT+set}"; then
+[[# Defining POSIXLY_CORRECT causes bison to complain if options are
+# added after the grammar file name, so skip these checks in that
+# case.
+if test "$POSIXLY_CORRECT_IS_EXPORTED" = false; then

           ]AT_SAVE_SPECIAL_FILES[
 
           ]AT_SAVE_SPECIAL_FILES[
 

-          # To avoid expanding it repeatedly, store specified stdout.
-          ]AT_DATA([expout], [$3])[
+  # To avoid expanding it repeatedly, store specified stdout.
+  ]AT_DATA([expout], [$3])[

 
 

-          # Run with -Werror.
+  # Run with -Werror.

   ]AT_BISON_CHECK_([$1[ -Werror]], [[1]], [expout], [stderr])[
 
   ]AT_BISON_CHECK_([$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
+  # Build expected stderr up to and including the "warnings being
+  # treated as errors" message.
+  ]AT_DATA([[experr]], [$4])[
+  $PERL -pi -e 's{(.*): warning: (.*)\[-W(.*)\]$}
+                 {$][1: error: $][2\@<:@-Werror=$][3@:>@}' experr
+  ]AT_CHECK([[sed 's,.*/$,,' stderr 1>&2]], [[0]], [[]], [experr])[
+
+  # Now check --warnings=error.
+  cp stderr experr

   ]AT_BISON_CHECK_([$1[ --warnings=error]], [[1]], [expout], [experr])[
 
   ]AT_BISON_CHECK_([$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.
+  # 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_BISON_CHECK_([$1[ -Wnone -Werror]], [[0]], [expout])[
   ]AT_BISON_CHECK_([$1[ --warnings=none -Werror]], [[0]], [expout])[
 
   ]AT_BISON_CHECK_([$1[ -Wnone -Werror]], [[0]], [expout])[
   ]AT_BISON_CHECK_([$1[ --warnings=none -Werror]], [[0]], [expout])[
 

-          ]AT_RESTORE_SPECIAL_FILES[
+  ]AT_RESTORE_SPECIAL_FILES[

 fi]dnl
 ])
 
 fi]dnl
 ])
 


@@ -527,7 +529,7 @@ 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])


@@ -556,10 +558,10 @@ m4_define([AT_BISON_CHECK_XML],
   AT_CHECK([[$XSLTPROC \
              `]]AT_QUELL_VALGRIND[[ bison --print-datadir`/xslt/xml2text.xsl \
              xml-tests/test.xml]], [[0]], [expout])
   AT_CHECK([[$XSLTPROC \
              `]]AT_QUELL_VALGRIND[[ bison --print-datadir`/xslt/xml2text.xsl \
              xml-tests/test.xml]], [[0]], [expout])

-  [cp xml-tests/test.dot expout]
+  [sort xml-tests/test.dot > expout]

   AT_CHECK([[$XSLTPROC \
              `]]AT_QUELL_VALGRIND[[ bison --print-datadir`/xslt/xml2dot.xsl \
   AT_CHECK([[$XSLTPROC \
              `]]AT_QUELL_VALGRIND[[ bison --print-datadir`/xslt/xml2dot.xsl \

-             xml-tests/test.xml]], [[0]], [expout])
+             xml-tests/test.xml | sort]], [[0]], [expout])

   [rm -rf xml-tests expout]
   AT_RESTORE_SPECIAL_FILES
 [fi]])
   [rm -rf xml-tests expout]
   AT_RESTORE_SPECIAL_FILES
 [fi]])


@@ -593,7 +595,8 @@ 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(m4_join([ ],
+[AT_CHECK([$BISON_C_WORKS], 0, ignore, ignore)
+AT_CHECK(m4_join([ ],

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


@@ -679,6 +682,44 @@ m4_define([AT_FULL_COMPILE],
 ])
 
 
 ])
 
 

+
+# AT_SKIP_IF_CANNOT_LINK_C_AND_CXX
+# --------------------------------
+# Check that we can link together C and C++ objects.
+m4_define([AT_SKIP_IF_CANNOT_LINK_C_AND_CXX],
+[AT_DATA([c-and-cxx.h],
+[[#ifdef __cplusplus
+extern "C"
+{
+#endif
+  int fortytwo (void);
+#ifdef __cplusplus
+}
+#endif
+]])
+AT_DATA([c-only.c],
+[[#include "c-and-cxx.h"
+int
+main (void)
+{
+  return fortytwo () == 42 ? 0 : 1;
+}
+]])
+AT_DATA([cxx-only.cc],
+[[#include "c-and-cxx.h"
+int fortytwo ()
+{
+  return 42;
+}
+]])
+AT_COMPILE([c-only.o], [c-only.c])
+AT_COMPILE_CXX([cxx-only.o], [cxx-only.cc])
+AT_CHECK([$CXX $CXXFLAGS $CPPFLAGS $LDFLAGS c-only.o cxx-only.o -o c-and-cxx ||
+          exit 77], [ignore], [ignore])
+AT_PARSER_CHECK([./c-and-cxx])
+])
+
+

 ## ---------------------------- ##
 ## Running a generated parser.  ##
 ## ---------------------------- ##
 ## ---------------------------- ##
 ## Running a generated parser.  ##
 ## ---------------------------- ##


@@ -827,9 +868,9 @@ m4_if(m4_index(m4_quote($3), [no-xml]), -1,
                                [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,

-      [AT_CHECK([[sed -n '/^state 0$/,$p' input.output]], [[0]],
+      [AT_CHECK([[sed -n '/^State 0$/,$p' input.output]], [[0]],

                 m4_dquote($8))],
                 m4_dquote($8))],

-      [AT_CHECK([[sed -n 's/^state //p' input.output | tail -1]], [[0]],
+      [AT_CHECK([[sed -n 's/^State //p' input.output | tail -1]], [[0]],

                 m4_dquote($8)[[
 ]])])
 
                 m4_dquote($8)[[
 ]])])
 


@@ -860,12 +901,20 @@ 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.