From: Bruno Haible <bruno@clisp.org>
Date: Mon, 8 Mar 2010 01:04:28 +0000 (+0100)
Subject: New module 'ansi-c++-opt'.
X-Git-Tag: v0.1~4534
X-Git-Url: http://erislabs.net/gitweb/?a=commitdiff_plain;h=2893f5e97d5f56ccefdf3d315ed5b4a958eee769;p=gnulib.git

New module 'ansi-c++-opt'.
---

diff --git a/ChangeLog b/ChangeLog
index bde1e828d..b9da4654f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2010-03-07  Bruno Haible  <bruno@clisp.org>
 
+	New module 'ansi-c++-opt'.
+	* modules/ansi-c++-opt: New file.
+	* m4/ansi-c++.m4: New file, from GNU gettext with modifications.
+
 	Document C++ namespace mode.
 	* doc/gnulib.texi (A C++ namespace for gnulib): New section.
 
diff --git a/m4/ansi-c++.m4 b/m4/ansi-c++.m4
new file mode 100644
index 000000000..60662619c
--- /dev/null
+++ b/m4/ansi-c++.m4
@@ -0,0 +1,85 @@
+# ansi-c++.m4 serial 2
+dnl Copyright (C) 2002-2003, 2010 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Bruno Haible.
+
+# gl_PROG_ANSI_CXX([ANSICXX_VARIABLE], [ANSICXX_CONDITIONAL])
+# Sets ANSICXX_VARIABLE to the name of a sufficiently ANSI C++ compliant
+# compiler, or to ":" if none is found.
+# Defines the Automake condition ANSICXX_CONDITIONAL to true if such a compiler
+# was found, or to false if not.
+
+AC_DEFUN([gl_PROG_ANSI_CXX],
+[
+  m4_if([$1], [CXX], [],
+    [gl_save_CXX="$CXX"])
+  if test -z "$CXX"; then
+    if test -n "$CCC"; then
+      CXX="$CCC"
+    else
+      AC_CHECK_PROGS([CXX], [g++ c++ gpp aCC CC cxx cc++ cl FCC KCC RCC xlC_r xlC], [:])
+    fi
+  fi
+  if test "$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$ac_exeext; then
+      gl_cv_prog_ansicxx_works=yes
+      if (./conftest; exit) 2>/dev/null; then
+        gl_cv_prog_ansicxx_cross=no
+      else
+        gl_cv_prog_ansicxx_cross=yes
+      fi
+    else
+      gl_cv_prog_ansicxx_works=no
+    fi
+    rm -fr conftest*
+    AC_LANG_POP([C++])
+    AC_MSG_RESULT([$gl_cv_prog_ansicxx_works])
+    if test $gl_cv_prog_ansicxx_works = no; then
+      CXX=:
+    else
+      dnl Test for namespaces.
+      dnl We don't bother supporting pre-ANSI-C++ compilers.
+      AC_MSG_CHECKING([whether the C++ compiler supports namespaces])
+      AC_LANG_PUSH([C++])
+      cat <<EOF > conftest.$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$ac_exeext; then
+        gl_cv_prog_ansicxx_namespaces=yes
+      else
+        gl_cv_prog_ansicxx_namespaces=no
+      fi
+      rm -fr conftest*
+      AC_LANG_POP([C++])
+      AC_MSG_RESULT([$gl_cv_prog_ansicxx_namespaces])
+      if test $gl_cv_prog_ansicxx_namespaces = no; then
+        CXX=:
+      fi
+    fi
+  fi
+  m4_if([$1], [CXX], [],
+    [$1="$CXX"
+     CXX="$gl_save_CXX"])
+  AC_SUBST([$1])
+
+  AM_CONDITIONAL([$2], [test "$$1" != ":"])
+
+  dnl This macro invocation resolves an automake error:
+  dnl /usr/local/share/automake-1.11/am/depend2.am: am__fastdepCXX does not appear in AM_CONDITIONAL
+  dnl /usr/local/share/automake-1.11/am/depend2.am:   The usual way to define `am__fastdepCXX' is to add `AC_PROG_CXX'
+  dnl /usr/local/share/automake-1.11/am/depend2.am:   to `configure.ac' and run `aclocal' and `autoconf' again.
+  _AM_DEPENDENCIES([CXX])
+])
diff --git a/modules/ansi-c++-opt b/modules/ansi-c++-opt
new file mode 100644
index 000000000..8e28ff82c
--- /dev/null
+++ b/modules/ansi-c++-opt
@@ -0,0 +1,20 @@
+Description:
+Optional use of an ANSI C++ compiler.
+
+Files:
+m4/ansi-c++.m4
+
+Depends-on:
+
+configure.ac:
+gl_PROG_ANSI_CXX([CXX], [ANSICXX])
+
+Makefile.am:
+
+Include:
+
+License:
+LGPLv2+
+
+Maintainer:
+Bruno Haible