From octave-maintainers-request at bevo dot che dot wisc dot edu  Wed Jan 31 11:05:27 2001
Subject: Re: ISO C++ and Octave
From: Mumit Khan <khan at NanoTech dot Wisc dot EDU>
To: octave-maintainers at bevo dot che dot wisc dot edu
cc: khan at xraylith dot wisc dot edu
Date: Wed, 31 Jan 2001 11:05:25 -0600 (CST)

Here's the config patch for checking for ISO-C++ compliant library. It's
extremely naive, but it's a start. I use it for a variety of reasonable
compilers (KAI, Sun Forte, and a few other EDG derived ones), and it 
does the job for me. I need numeric_limits<> in my numerical code, and
I check for the explicitly. Octave doesn't need anything special here.

2001-01-31  Mumit Khan  <khan at nanotech dot wisc dot edu>

	* aclocal.m4 (OCTAVE_CXX_ISO_COMPLIANT_LIBRARY): New macro.
	* configure.in: Use.

Index: aclocal.m4
===================================================================
RCS file: /homes/khan/src/math/CVSROOT/octave-test/aclocal.m4,v
retrieving revision 1.1.1.2
diff -u -3 -p -r1.1.1.2 aclocal.m4
--- aclocal.m4	2001/01/30 04:41:41	1.1.1.2
+++ aclocal.m4	2001/01/31 16:53:10
 at @ -931,3 +931,40 @@ EOF
     AC_DEFINE(CXX_PREPENDS_UNDERSCORE)
   fi
 ])
+dnl
+dnl See if the C++ library is ISO compliant.
+dnl FIXME: This is obviously very simplistic, and trivially fooled.
+dnl
+dnl OCTAVE_CXX_ISO_COMPLIANT_LIBRARY
+AC_DEFUN(OCTAVE_CXX_ISO_COMPLIANT_LIBRARY, [
+  AC_REQUIRE([AC_PROG_CXX])
+  AC_MSG_CHECKING([if C++ library is ISO compliant])
+  AC_CACHE_VAL(octave_cv_cxx_iso_compliant_library, [
+    AC_LANG_SAVE
+    AC_LANG_CPLUSPLUS
+    rm -f conftest.h
+    for inc in algorithm bitset cassert cctype cerrno cfloat ciso646 \
+	climits clocale cmath complex csetjmp csignal cstdarg cstddef \
+	cstdio cstdlib cstring ctime cwchar cwctype deque exception \
+	fstream functional iomanip ios iosfwd iostream istream iterator \
+	limits list locale map memory new numeric ostream queue set \
+	sstream stack stdexcept streambuf string strstream typeinfo \
+	utility valarray vector; do
+      echo "#include <$inc>" >> conftest.h
+    done
+    AC_TRY_LINK([#include "conftest.h"], [
+        std::bitset<50> flags;
+        flags.set();
+        int digits = std::numeric_limits<unsigned long>::digits;
+        digits = 0;
+      ],
+      octave_cv_cxx_iso_compliant_library=yes,
+      octave_cv_cxx_iso_compliant_library=no
+    )
+    AC_LANG_RESTORE
+  ])
+  AC_MSG_RESULT($octave_cv_cxx_iso_compliant_library)
+  if test $octave_cv_cxx_iso_compliant_library = yes; then
+    AC_DEFINE(CXX_ISO_COMPLIANT_LIBRARY)
+  fi
+])
Index: configure.in
===================================================================
RCS file: /homes/khan/src/math/CVSROOT/octave-test/configure.in,v
retrieving revision 1.1.1.2
diff -u -3 -p -r1.1.1.2 configure.in
--- configure.in	2001/01/30 04:41:41	1.1.1.2
+++ configure.in	2001/01/31 16:53:42
 at @ -199,6 +199,7 @@ fi
 AC_SUBST(CXX_VERSION)
 
 OCTAVE_CXX_NEW_FRIEND_TEMPLATE_DECL
+OCTAVE_CXX_ISO_COMPLIANT_LIBRARY
 
 ### See which C compiler to use (we expect to find gcc).