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127 lines
3.4 KiB
127 lines
3.4 KiB
16 years ago
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#***************************************************************************
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# $Id$
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#
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# Copyright (C) 2008 by Daniel Stenberg et al
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose and without fee is hereby granted, provided
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# that the above copyright notice appear in all copies and that both that
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# copyright notice and this permission notice appear in supporting
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# documentation, and that the name of M.I.T. not be used in advertising or
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# publicity pertaining to distribution of the software without specific,
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# written prior permission. M.I.T. makes no representations about the
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# suitability of this software for any purpose. It is provided "as is"
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# without express or implied warranty.
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#
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#***************************************************************************
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# File version for 'aclocal' use. Keep it a single number.
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# serial 1
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dnl CARES_INCLUDES_STRING
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dnl -------------------------------------------------
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dnl Set up variable with list of headers that must be
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dnl included when string.h is to be included.
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AC_DEFUN([CARES_INCLUDES_STRING], [
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cares_includes_string="\
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/* includes start */
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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/* includes end */"
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AC_CHECK_HEADERS(
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sys/types.h string.h,
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[], [], [$cares_includes_string])
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])
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dnl CARES_CHECK_FUNC_STRDUP
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dnl -------------------------------------------------
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dnl Verify if strdup is available, prototyped, and
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dnl can be compiled. If all of these are true, and
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dnl usage has not been previously disallowed with
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dnl shell variable cares_disallow_strdup, then
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dnl HAVE_STRDUP will be defined.
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AC_DEFUN([CARES_CHECK_FUNC_STRDUP], [
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AC_REQUIRE([CARES_INCLUDES_STRING])dnl
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#
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tst_links_strdup="unknown"
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tst_proto_strdup="unknown"
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tst_compi_strdup="unknown"
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tst_allow_strdup="unknown"
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#
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AC_MSG_CHECKING([if strdup can be linked])
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AC_LINK_IFELSE([
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AC_LANG_FUNC_LINK_TRY([strdup])
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],[
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AC_MSG_RESULT([yes])
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tst_links_strdup="yes"
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],[
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AC_MSG_RESULT([no])
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tst_links_strdup="no"
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])
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#
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if test "$tst_links_strdup" = "yes"; then
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AC_MSG_CHECKING([if strdup is prototyped])
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AC_EGREP_CPP([strdup],[
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$cares_includes_string
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],[
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AC_MSG_RESULT([yes])
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tst_proto_strdup="yes"
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],[
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AC_MSG_RESULT([no])
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tst_proto_strdup="no"
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])
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fi
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#
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if test "$tst_proto_strdup" = "yes"; then
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AC_MSG_CHECKING([if strdup is compilable])
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AC_COMPILE_IFELSE([
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AC_LANG_PROGRAM([[
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$cares_includes_string
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]],[[
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if(0 != strdup(0))
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return 1;
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]])
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],[
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AC_MSG_RESULT([yes])
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tst_compi_strdup="yes"
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],[
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AC_MSG_RESULT([no])
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tst_compi_strdup="no"
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])
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fi
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#
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if test "$tst_compi_strdup" = "yes"; then
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AC_MSG_CHECKING([if strdup usage allowed])
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if test "x$cares_disallow_strdup" != "xyes"; then
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AC_MSG_RESULT([yes])
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tst_allow_strdup="yes"
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else
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AC_MSG_RESULT([no])
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tst_allow_strdup="no"
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fi
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fi
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#
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AC_MSG_CHECKING([if strdup might be used])
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if test "$tst_links_strdup" = "yes" &&
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test "$tst_proto_strdup" = "yes" &&
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test "$tst_compi_strdup" = "yes" &&
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test "$tst_allow_strdup" = "yes"; then
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AC_MSG_RESULT([yes])
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AC_DEFINE_UNQUOTED(HAVE_STRDUP, 1,
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[Define to 1 if you have the strdup function.])
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ac_cv_func_strdup="yes"
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else
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AC_MSG_RESULT([no])
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ac_cv_func_strdup="no"
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fi
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])
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