65 lines
2.2 KiB
Plaintext
65 lines
2.2 KiB
Plaintext
# Macros to detect certain C++ features
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# $Header: /cvsroot/pgsql/config/Attic/cxx.m4,v 1.3 2002/03/29 20:54:33 petere Exp $
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# PGAC_CLASS_STRING
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# -----------------
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# Look for class `string'. First look for the <string> header. If this
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# is found a <string> header then it's probably safe to assume that
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# class string exists. If not, check to make sure that <string.h>
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# defines class `string'.
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AC_DEFUN([PGAC_CLASS_STRING],
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[AC_LANG_PUSH(C++)
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AC_CHECK_HEADER(string,
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[AC_DEFINE(HAVE_CXX_STRING_HEADER, 1,
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[Define to 1 if you have the C++ <string> header])],
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[AC_CACHE_CHECK([for class string in <string.h>],
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[pgac_cv_class_string_in_string_h],
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[AC_TRY_COMPILE([#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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],
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[string foo = "test"],
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[pgac_cv_class_string_in_string_h=yes],
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[pgac_cv_class_string_in_string_h=no])])
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if test x"$pgac_cv_class_string_in_string_h" != xyes ; then
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AC_MSG_ERROR([neither <string> nor <string.h> seem to define the C++ class 'string'])
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fi
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])
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AC_LANG_POP(C++)])# PGAC_CLASS_STRING
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# PGAC_CXX_NAMESPACE_STD
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# ----------------------
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# Check whether the C++ compiler understands `using namespace std'.
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#
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# Note 1: On at least some compilers, it will not work until you've
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# included a header that mentions namespace std. Thus, include the
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# usual suspects before trying it.
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#
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# Note 2: This test does not actually reveal whether the C++ compiler
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# properly understands namespaces in all generality. (GNU C++ 2.8.1
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# is one that doesn't.) However, we don't care.
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AC_DEFUN([PGAC_CXX_NAMESPACE_STD],
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[AC_REQUIRE([PGAC_CLASS_STRING])
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AC_CACHE_CHECK([for namespace std in C++],
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pgac_cv_cxx_namespace_std,
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[
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AC_LANG_PUSH(C++)
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AC_TRY_COMPILE(
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[#include <stdio.h>
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#include <stdlib.h>
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#ifdef HAVE_CXX_STRING_HEADER
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#include <string>
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#endif
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using namespace std;
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], [],
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[pgac_cv_cxx_namespace_std=yes],
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[pgac_cv_cxx_namespace_std=no])
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AC_LANG_POP(C++)])
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if test $pgac_cv_cxx_namespace_std = yes ; then
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AC_DEFINE(HAVE_NAMESPACE_STD, 1, [Define to 1 if the C++ compiler understands 'using namespace std'])
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fi])# PGAC_CXX_NAMESPACE_STD
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