--- /dev/null
+# config/check_decls.m4
+
+# This file redefines the standard Autoconf macro _AC_CHECK_DECL_BODY,
+# and adds a supporting function _AC_UNDECLARED_WARNING, to make
+# AC_CHECK_DECLS behave correctly when checking for built-in library
+# functions with clang.
+
+# This is based on commit 82ef7805faffa151e724aa76c245ec590d174580
+# in the Autoconf git repository. We can drop it if they ever get
+# around to releasing a new version of Autoconf. In the meantime,
+# it's distributed under Autoconf's license:
+
+# This file is part of Autoconf. This program is free
+# software; you can redistribute it and/or modify it under the
+# terms of the GNU General Public License as published by the
+# Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# Under Section 7 of GPL version 3, you are granted additional
+# permissions described in the Autoconf Configure Script Exception,
+# version 3.0, as published by the Free Software Foundation.
+#
+# You should have received a copy of the GNU General Public License
+# and a copy of the Autoconf Configure Script Exception along with
+# this program; see the files COPYINGv3 and COPYING.EXCEPTION
+# respectively. If not, see <http://www.gnu.org/licenses/>.
+
+# Written by David MacKenzie, with help from
+# Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
+# Roland McGrath, Noah Friedman, david d zuhn, and many others.
+
+
+# _AC_UNDECLARED_WARNING
+# ----------------------
+# Set ac_[]_AC_LANG_ABBREV[]_decl_warn_flag=yes if the compiler uses a warning,
+# not a more-customary error, to report some undeclared identifiers. Fail when
+# an affected compiler warns also on valid input. _AC_PROG_PREPROC_WORKS_IFELSE
+# solves a related problem.
+AC_DEFUN([_AC_UNDECLARED_WARNING],
+[# The Clang compiler raises a warning for an undeclared identifier that matches
+# a compiler builtin function. All extant Clang versions are affected, as of
+# Clang 3.6.0. Test a builtin known to every version. This problem affects the
+# C and Objective C languages, but Clang does report an error under C++ and
+# Objective C++.
+#
+# Passing -fno-builtin to the compiler would suppress this problem. That
+# strategy would have the advantage of being insensitive to stray warnings, but
+# it would make tests less realistic.
+AC_CACHE_CHECK([how $[]_AC_CC[] reports undeclared, standard C functions],
+[ac_cv_[]_AC_LANG_ABBREV[]_decl_report],
+[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [(void) strchr;])],
+ [AS_IF([test -s conftest.err], [dnl
+ # For AC_CHECK_DECL to react to warnings, the compiler must be silent on
+ # valid AC_CHECK_DECL input. No library function is consistently available
+ # on freestanding implementations, so test against a dummy declaration.
+ # Include always-available headers on the off chance that they somehow
+ # elicit warnings.
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([dnl
+#include <float.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <stddef.h>
+extern void ac_decl (int, char *);],
+[@%:@ifdef __cplusplus
+ (void) ac_decl ((int) 0, (char *) 0);
+ (void) ac_decl;
+@%:@else
+ (void) ac_decl;
+@%:@endif
+])],
+ [AS_IF([test -s conftest.err],
+ [AC_MSG_FAILURE([cannot detect from compiler exit status or warnings])],
+ [ac_cv_[]_AC_LANG_ABBREV[]_decl_report=warning])],
+ [AC_MSG_FAILURE([cannot compile a simple declaration test])])],
+ [AC_MSG_FAILURE([compiler does not report undeclared identifiers])])],
+ [ac_cv_[]_AC_LANG_ABBREV[]_decl_report=error])])
+
+case $ac_cv_[]_AC_LANG_ABBREV[]_decl_report in
+ warning) ac_[]_AC_LANG_ABBREV[]_decl_warn_flag=yes ;;
+ *) ac_[]_AC_LANG_ABBREV[]_decl_warn_flag= ;;
+esac
+])# _AC_UNDECLARED_WARNING
+
+# _AC_CHECK_DECL_BODY
+# -------------------
+# Shell function body for AC_CHECK_DECL.
+m4_define([_AC_CHECK_DECL_BODY],
+[ AS_LINENO_PUSH([$[]1])
+ # Initialize each $ac_[]_AC_LANG_ABBREV[]_decl_warn_flag once.
+ AC_DEFUN([_AC_UNDECLARED_WARNING_]_AC_LANG_ABBREV,
+ [_AC_UNDECLARED_WARNING])dnl
+ AC_REQUIRE([_AC_UNDECLARED_WARNING_]_AC_LANG_ABBREV)dnl
+ [as_decl_name=`echo $][2|sed 's/ *(.*//'`]
+ [as_decl_use=`echo $][2|sed -e 's/(/((/' -e 's/)/) 0&/' -e 's/,/) 0& (/g'`]
+ AC_CACHE_CHECK([whether $as_decl_name is declared], [$[]3],
+ [ac_save_werror_flag=$ac_[]_AC_LANG_ABBREV[]_werror_flag
+ ac_[]_AC_LANG_ABBREV[]_werror_flag="$ac_[]_AC_LANG_ABBREV[]_decl_warn_flag$ac_[]_AC_LANG_ABBREV[]_werror_flag"
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$[]4],
+[@%:@ifndef $[]as_decl_name
+@%:@ifdef __cplusplus
+ (void) $[]as_decl_use;
+@%:@else
+ (void) $[]as_decl_name;
+@%:@endif
+@%:@endif
+])],
+ [AS_VAR_SET([$[]3], [yes])],
+ [AS_VAR_SET([$[]3], [no])])
+ ac_[]_AC_LANG_ABBREV[]_werror_flag=$ac_save_werror_flag])
+ AS_LINENO_POP
+])# _AC_CHECK_DECL_BODY
ac_fn_c_check_decl ()
{
as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
- as_decl_name=`echo $2|sed 's/ *(.*//'`
+ # Initialize each $ac_[]_AC_LANG_ABBREV[]_decl_warn_flag once.
+ as_decl_name=`echo $2|sed 's/ *(.*//'`
as_decl_use=`echo $2|sed -e 's/(/((/' -e 's/)/) 0&/' -e 's/,/) 0& (/g'`
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $as_decl_name is declared" >&5
$as_echo_n "checking whether $as_decl_name is declared... " >&6; }
if eval \${$3+:} false; then :
$as_echo_n "(cached) " >&6
else
+ ac_save_werror_flag=$ac_c_werror_flag
+ ac_c_werror_flag="$ac_c_decl_warn_flag$ac_c_werror_flag"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
$4
eval "$3=no"
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ ac_c_werror_flag=$ac_save_werror_flag
fi
eval ac_res=\$$3
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
# posix_fadvise() is a no-op on Solaris, so don't incur function overhead
# by calling it, 2009-04-02
# http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libc/port/gen/posix_fadvise.c
-if test "$PORTNAME" != "solaris"; then
+# The Clang compiler raises a warning for an undeclared identifier that matches
+# a compiler builtin function. All extant Clang versions are affected, as of
+# Clang 3.6.0. Test a builtin known to every version. This problem affects the
+# C and Objective C languages, but Clang does report an error under C++ and
+# Objective C++.
+#
+# Passing -fno-builtin to the compiler would suppress this problem. That
+# strategy would have the advantage of being insensitive to stray warnings, but
+# it would make tests less realistic.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking how $CC reports undeclared, standard C functions" >&5
+$as_echo_n "checking how $CC reports undeclared, standard C functions... " >&6; }
+if ${ac_cv_c_decl_report+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+int
+main ()
+{
+(void) strchr;
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ if test -s conftest.err; then :
+ # For AC_CHECK_DECL to react to warnings, the compiler must be silent on
+ # valid AC_CHECK_DECL input. No library function is consistently available
+ # on freestanding implementations, so test against a dummy declaration.
+ # Include always-available headers on the off chance that they somehow
+ # elicit warnings.
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+#include <float.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <stddef.h>
+extern void ac_decl (int, char *);
+int
+main ()
+{
+#ifdef __cplusplus
+ (void) ac_decl ((int) 0, (char *) 0);
+ (void) ac_decl;
+#else
+ (void) ac_decl;
+#endif
+
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ if test -s conftest.err; then :
+ { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "cannot detect from compiler exit status or warnings
+See \`config.log' for more details" "$LINENO" 5; }
+else
+ ac_cv_c_decl_report=warning
+fi
+else
+ { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "cannot compile a simple declaration test
+See \`config.log' for more details" "$LINENO" 5; }
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+else
+ { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "compiler does not report undeclared identifiers
+See \`config.log' for more details" "$LINENO" 5; }
+fi
+else
+ ac_cv_c_decl_report=error
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_decl_report" >&5
+$as_echo "$ac_cv_c_decl_report" >&6; }
+
+case $ac_cv_c_decl_report in
+ warning) ac_c_decl_warn_flag=yes ;;
+ *) ac_c_decl_warn_flag= ;;
+esac
+
+if test "$PORTNAME" != "solaris"; then :
+
for ac_func in posix_fadvise
do :
ac_fn_c_check_func "$LINENO" "posix_fadvise" "ac_cv_func_posix_fadvise"
#define HAVE_DECL_POSIX_FADVISE $ac_have_decl
_ACEOF
-fi
+
+fi # fi
ac_fn_c_check_decl "$LINENO" "fdatasync" "ac_cv_have_decl_fdatasync" "#include <unistd.h>
"
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