bison: avoid warnings from static code analysis

[bison.git] / m4 / cxx.m4

diff --git a/m4/cxx.m4 b/m4/cxx.m4
index 1d17e8361c10fbc32504f5a5be28cc6abf67b5ea..7b0d9c1a1b1a305180ea75bc376a365205375bf2 100644 (file)
--- a/m4/cxx.m4
+++ b/m4/cxx.m4
@@ -1,11 +1,11 @@
 # -*- Autoconf -*-
 # Sanity-test a C++ compiler.
 #
 # -*- Autoconf -*-
 # Sanity-test a C++ compiler.
 #

-# Copyright (C) 2004 Free Software Foundation, Inc.
+# Copyright (C) 2004, 2006, 2009-2015 Free Software Foundation, Inc.

 #
 #

-# This program is free software; you can redistribute it and/or modify
+# 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
 # it under the terms of the GNU General Public License as published by

-# the Free Software Foundation; either version 2 of the License, or
+# the Free Software Foundation, either version 3 of the License, or

 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,


@@ -14,25 +14,38 @@
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License

-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-# 02111-1307  USA
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.

 
 

-# Written by Paul Eggert <eggert@cs.ucla.edu>.
+# Written by Paul Eggert.

 
 AC_DEFUN([BISON_TEST_FOR_WORKING_CXX_COMPILER],
 [
  AC_CACHE_CHECK([whether $CXX builds executables that work],
    bison_cv_cxx_works,
    [AC_LANG_PUSH([C++])
 
 AC_DEFUN([BISON_TEST_FOR_WORKING_CXX_COMPILER],
 [
  AC_CACHE_CHECK([whether $CXX builds executables that work],
    bison_cv_cxx_works,
    [AC_LANG_PUSH([C++])

-    AC_RUN_IFELSE(
+    bison_cv_cxx_works=no
+    AC_COMPILE_IFELSE(

       [AC_LANG_PROGRAM(
       [AC_LANG_PROGRAM(

-        [#include <iostream>
-         using namespace std;],
-         [cout << "";])],
-      [bison_cv_cxx_works=yes],
-      [bison_cv_cxx_works=no],
-      [bison_cv_cxx_works=cross])
+         [#include <cstdlib>
+          #include <iostream>
+          #include <map>
+          #include <string>
+          using namespace std;],
+         [std::cerr << "";
+          cout << "";
+          typedef std::pair<unsigned int, int> uipair;
+          std::map<unsigned int, int> m;
+          std::map<unsigned int, int>::iterator i;
+          m.insert (uipair (4, -4));
+          for (i = m.begin (); i != m.end (); ++i)
+            if (i->first != 4)
+              return 1;])],
+      [AS_IF([AC_TRY_COMMAND([$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD])],
+         [AS_IF([test "$cross_compiling" = yes],
+            [bison_cv_cxx_works=cross],
+            [AS_IF([AC_TRY_COMMAND(./conftest$ac_exeext)],
+               [bison_cv_cxx_works=yes])])])
+       rm -f conftest$ac_exeext])

     AC_LANG_POP([C++])])
 
  case $bison_cv_cxx_works in
     AC_LANG_POP([C++])])
 
  case $bison_cv_cxx_works in


@@ -43,4 +56,14 @@ AC_DEFUN([BISON_TEST_FOR_WORKING_CXX_COMPILER],
  esac
 
  AC_SUBST([BISON_CXX_WORKS])
  esac
 
  AC_SUBST([BISON_CXX_WORKS])

+ AM_CONDITIONAL(BISON_CXX_WORKS, test $bison_cv_cxx_works = yes)
+])
+
+# BISON_CXX_COMPILER_POSIXLY_CORRECT
+# ----------------------------------
+# Whether the C++ compiler supports -g in POSIXLY_CORRECT mode.
+AC_DEFUN([BISON_CXX_COMPILER_POSIXLY_CORRECT],
+[AC_LANG_PUSH([C++])
+BISON_LANG_COMPILER_POSIXLY_CORRECT
+AC_LANG_POP([C++])

 ])
 ])