Test for C++ compiler with namespace support.

diff --git a/gettext-runtime/m4/ansi-c++.m4 b/gettext-runtime/m4/ansi-c++.m4
new file mode 100644 (file)
index 0000000..3d2fcb7
--- /dev/null
+++ b/gettext-runtime/m4/ansi-c++.m4
@@ -0,0 +1,64 @@
+# ansi-c++.m4 serial 1 (gettext-0.11.6)
+dnl Copyright (C) 2002-2003 Free Software Foundation, Inc.
+dnl This file is free software, distributed under the terms of the GNU
+dnl General Public License.  As a special exception to the GNU General
+dnl Public License, this file may be distributed as part of a program
+dnl that contains a configuration script generated by Autoconf, under
+dnl the same distribution terms as the rest of that program.
+
+dnl From Bruno Haible.
+
+# Sets CXX to the name of a sufficiently ANSI C++ compliant compiler,
+# or to ":" if none is found.
+
+AC_DEFUN([gt_PROG_ANSI_CXX],
+[
+AC_CHECK_PROGS(CXX, $CCC g++ c++ gpp aCC CC cxx cc++ cl FCC KCC RCC xlC_r xlC, :)
+if test "$CXX" != ":"; then
+  dnl Use a modified version of AC_PROG_CXX_WORKS that does not exit
+  dnl upon failure.
+  AC_MSG_CHECKING([whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) works])
+  AC_LANG_PUSH(C++)
+  AC_ARG_VAR([CXX], [C++ compiler command])
+  AC_ARG_VAR([CXXFLAGS], [C++ compiler flags])
+  echo 'int main () { return 0; }' > conftest.$ac_ext
+  if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
+    ac_cv_prog_cxx_works=yes
+    if (./conftest; exit) 2>/dev/null; then
+      ac_cv_prog_cxx_cross=no
+    else
+      ac_cv_prog_cxx_cross=yes
+    fi
+  else
+    ac_cv_prog_cxx_works=no
+  fi
+  rm -fr conftest*
+  AC_LANG_POP(C++)
+  AC_MSG_RESULT($ac_cv_prog_cxx_works)
+  if test $ac_cv_prog_cxx_works = no; then
+    CXX=:
+  else
+    dnl Test for namespaces. Both libasprintf and tests/lang-c++ need it.
+    dnl We don't bother supporting pre-ANSI-C++ compilers.
+    AC_MSG_CHECKING([whether the C++ compiler supports namespaces])
+    AC_LANG_PUSH(C++)
+    cat <<EOF > conftest.$ac_ext
+#include <iostream>
+namespace test { using namespace std; }
+std::ostream* ptr;
+int main () { return 0; }
+EOF
+    if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
+      gt_cv_prog_cxx_namespaces=yes
+    else
+      gt_cv_prog_cxx_namespaces=no
+    fi
+    rm -fr conftest*
+    AC_LANG_POP(C++)
+    AC_MSG_RESULT($gt_cv_prog_cxx_namespaces)
+    if test $gt_cv_prog_cxx_namespaces = no; then
+      CXX=:
+    fi
+  fi
+fi
+])