mirror of
https://github.com/postgres/postgres.git
synced 2025-10-31 10:30:33 +03:00
Fix configure's AC_CHECK_DECLS tests to work correctly with clang.
The test case that Autoconf uses to discover whether a function has been declared doesn't work reliably with clang, because clang reports a warning not an error if the name is a known built-in function. On some platforms, this results in a lot of compile-time warnings about strlcpy and related functions not having been declared. There is a fix for this (by Noah Misch) in the upstream Autoconf sources, but since they've not made a release in years and show no indication of doing so anytime soon, let's just absorb their fix directly. We can revert this when and if we update to a newer Autoconf release. Back-patch to all supported branches. Discussion: https://postgr.es/m/26819.1542515567@sss.pgh.pa.us
This commit is contained in:
Tom Lane
1
aclocal.m4
vendored
1
aclocal.m4
vendored
@@ -4,6 +4,7 @@ m4_include([config/ax_prog_perl_modules.m4])
|
||||
m4_include([config/ax_pthread.m4])
|
||||
m4_include([config/c-compiler.m4])
|
||||
m4_include([config/c-library.m4])
|
||||
m4_include([config/check_decls.m4])
|
||||
m4_include([config/docbook.m4])
|
||||
m4_include([config/general.m4])
|
||||
m4_include([config/libtool.m4])
|
||||
|
||||
116
config/check_decls.m4
Normal file
116
config/check_decls.m4
Normal file
@@ -0,0 +1,116 @@
|
||||
# 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
|
||||
104
configure
vendored
104
configure
vendored
@@ -1756,13 +1756,16 @@ fi
|
||||
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
|
||||
@@ -1787,6 +1790,7 @@ else
|
||||
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: $ac_res" >&5
|
||||
@@ -4990,11 +4994,100 @@ fi
|
||||
test -n "$AWK" && break
|
||||
done
|
||||
|
||||
# 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 $ac_cv_c_decl_report in
|
||||
warning) ac_c_decl_warn_flag=yes ;;
|
||||
*) ac_c_decl_warn_flag= ;;
|
||||
esac
|
||||
|
||||
if test "$with_llvm" = yes; then :
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
if test -z "$LLVM_CONFIG"; then
|
||||
for ac_prog in llvm-config llvm-config-7 llvm-config-6.0 llvm-config-5.0 llvm-config-4.0 llvm-config-3.9
|
||||
do
|
||||
@@ -5250,7 +5343,8 @@ _ACEOF
|
||||
|
||||
|
||||
|
||||
fi
|
||||
|
||||
fi # fi
|
||||
|
||||
|
||||
unset CFLAGS
|
||||
@@ -15197,7 +15291,8 @@ esac
|
||||
# posix_fadvise() is a no-op on Solaris, so don't incur function overhead
|
||||
# by calling it, 2009-04-02
|
||||
# http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libc/port/gen/posix_fadvise.c
|
||||
if test "$PORTNAME" != "solaris"; then
|
||||
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"
|
||||
@@ -15221,7 +15316,8 @@ cat >>confdefs.h <<_ACEOF
|
||||
#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>
|
||||
"
|
||||
|
||||
@@ -392,7 +392,9 @@ PGAC_ARG_BOOL(with, llvm, no, [build with LLVM based JIT support],
|
||||
[AC_DEFINE([USE_LLVM], 1, [Define to 1 to build with LLVM based JIT support. (--with-llvm)])])
|
||||
AC_SUBST(with_llvm)
|
||||
dnl must use AS_IF here, else AC_REQUIRES inside PGAC_LLVM_SUPPORT malfunctions
|
||||
AS_IF([test "$with_llvm" = yes], [PGAC_LLVM_SUPPORT()])
|
||||
AS_IF([test "$with_llvm" = yes], [
|
||||
PGAC_LLVM_SUPPORT()
|
||||
]) # fi
|
||||
|
||||
|
||||
unset CFLAGS
|
||||
@@ -1640,10 +1642,11 @@ esac
|
||||
# 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 "$PORTNAME" != "solaris"; then
|
||||
dnl must use AS_IF here, else AC_REQUIRES inside AC_CHECK_DECLS malfunctions
|
||||
AS_IF([test "$PORTNAME" != "solaris"], [
|
||||
AC_CHECK_FUNCS(posix_fadvise)
|
||||
AC_CHECK_DECLS(posix_fadvise, [], [], [#include <fcntl.h>])
|
||||
fi
|
||||
]) # fi
|
||||
|
||||
AC_CHECK_DECLS(fdatasync, [], [], [#include <unistd.h>])
|
||||
AC_CHECK_DECLS([strlcat, strlcpy, strnlen])
|
||||
|
||||
Reference in New Issue
Block a user