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libstdc++: Test errno macros directly, not via autoconf [PR 93151]

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This fixes a bug caused by a mismatch between the macros defined by
<errno.h> when GCC is built and the macros defined by <errno.h> when
users include <system_error>. If the user code is compiled with
_XOPEN_SOURCE defined to 500 or 600, Darwin suppresses the
ENOTRECOVERABLE and EOWNERDEAD macros, which are not defined by SUSv3
(aka POSIX.1-2001).

Since POSIX requires the errno macros to be macros (and not variables or
enumerators) we can just test for them directly using the preprocessor.
That means that <system_error> will match what is actuallydefined when
it's included, not what was defined when GCC was built. With that change
there is no need for the GLIBCXX_CHECK_SYSTEM_ERROR configure checks and
they can be removed.

libstdc++-v3/ChangeLog:

	PR libstdc++/93151
	* acinclude.m4 (GLIBCXX_CHECK_SYSTEM_ERROR): Remove.
	* configure.ac: Regenerate.
	* config/os/generic/error_constants.h: Test POSIX errno macros
	directly, instead of corresponding _GLIBCXX_HAVE_EXXX macros.
	* testsuite/19_diagnostics/headers/system_error/errc_std_c++0x.cc:
	Likewise.
	* testsuite/19_diagnostics/headers/system_error/93151.cc: New
	test.
This commit is contained in:
Jonathan Wakely 2020-12-15 20:28:11 +00:00
parent 4d8476b05d
commit a2c2eec183
5 changed files with 53 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
libstdc++-v3/acinclude.m4
View File

@ -2372,35 +2372,6 @@ AC_DEFUN([GLIBCXX_CHECK_MATH11_PROTO], [
AC_LANG_RESTORE
])
dnl
dnl Check whether macros, etc are present for <system_error>
dnl
AC_DEFUN([GLIBCXX_CHECK_SYSTEM_ERROR], [
m4_pushdef([n_syserr], [1])dnl
m4_foreach([syserr], [EOWNERDEAD, ENOTRECOVERABLE, ENOLINK, EPROTO, ENODATA,
ENOSR, ENOSTR, ETIME, EBADMSG, ECANCELED,
EOVERFLOW, ENOTSUP, EIDRM, ETXTBSY,
ECHILD, ENOSPC, EPERM,
ETIMEDOUT, EWOULDBLOCK],
[m4_pushdef([SYSERR], m4_toupper(syserr))dnl
AC_MSG_CHECKING([for syserr])
AC_CACHE_VAL([glibcxx_cv_system_error[]n_syserr], [
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <errno.h>]],
[int i = syserr;])],
[glibcxx_cv_system_error[]n_syserr=yes],
[glibcxx_cv_system_error[]n_syserr=no])
])
AC_MSG_RESULT([$glibcxx_cv_system_error[]n_syserr])
if test x"$glibcxx_cv_system_error[]n_syserr" = x"yes"; then
AC_DEFINE([HAVE_]SYSERR, 1, [Define if ]syserr[ exists.])
fi
m4_define([n_syserr], m4_incr(n_syserr))dnl
m4_popdef([SYSERR])dnl
])
m4_popdef([n_syserr])dnl
])
dnl
dnl Check for what type of C headers to use.
dnl

28
libstdc++-v3/config/os/generic/error_constants.h
View File

@ -48,7 +48,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
bad_address = EFAULT,
bad_file_descriptor = EBADF,
#ifdef _GLIBCXX_HAVE_EBADMSG
#ifdef EBADMSG
bad_message = EBADMSG,
#endif
@ -68,7 +68,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
function_not_supported = ENOSYS,
host_unreachable = EHOSTUNREACH,
#ifdef _GLIBCXX_HAVE_EIDRM
#ifdef EIDRM
identifier_removed = EIDRM,
#endif
@ -86,13 +86,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
no_buffer_space = ENOBUFS,
no_child_process = ECHILD,
#ifdef _GLIBCXX_HAVE_ENOLINK
#ifdef ENOLINK
no_link = ENOLINK,
#endif
no_lock_available = ENOLCK,
#ifdef _GLIBCXX_HAVE_ENODATA
#ifdef ENODATA
no_message_available = ENODATA,
#endif
@ -100,7 +100,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
no_protocol_option = ENOPROTOOPT,
no_space_on_device = ENOSPC,
#ifdef _GLIBCXX_HAVE_ENOSR
#ifdef ENOSR
no_stream_resources = ENOSR,
#endif
@ -111,18 +111,18 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
not_a_directory = ENOTDIR,
not_a_socket = ENOTSOCK,
#ifdef _GLIBCXX_HAVE_ENOSTR
#ifdef ENOSTR
not_a_stream = ENOSTR,
#endif
not_connected = ENOTCONN,
not_enough_memory = ENOMEM,
#ifdef _GLIBCXX_HAVE_ENOTSUP
#ifdef ENOTSUP
not_supported = ENOTSUP,
#endif
#ifdef _GLIBCXX_HAVE_ECANCELED
#ifdef ECANCELED
operation_canceled = ECANCELED,
#endif
@ -131,13 +131,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
operation_not_supported = EOPNOTSUPP,
operation_would_block = EWOULDBLOCK,
#ifdef _GLIBCXX_HAVE_EOWNERDEAD
#ifdef EOWNERDEAD
owner_dead = EOWNERDEAD,
#endif
permission_denied = EACCES,
#ifdef _GLIBCXX_HAVE_EPROTO
#ifdef EPROTO
protocol_error = EPROTO,
#endif
@ -147,15 +147,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
resource_unavailable_try_again = EAGAIN,
result_out_of_range = ERANGE,
#ifdef _GLIBCXX_HAVE_ENOTRECOVERABLE
#ifdef ENOTRECOVERABLE
state_not_recoverable = ENOTRECOVERABLE,
#endif
#ifdef _GLIBCXX_HAVE_ETIME
#ifdef ETIME
stream_timeout = ETIME,
#endif
#ifdef _GLIBCXX_HAVE_ETXTBSY
#ifdef ETXTBSY
text_file_busy = ETXTBSY,
#endif
@ -165,7 +165,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
too_many_links = EMLINK,
too_many_symbolic_link_levels = ELOOP,
#ifdef _GLIBCXX_HAVE_EOVERFLOW
#ifdef EOVERFLOW
value_too_large = EOVERFLOW,
#endif

1
libstdc++-v3/configure.ac
View File

@ -183,7 +183,6 @@ GLIBCXX_ENABLE_VTABLE_VERIFY([no])
# Checks for operating systems support that doesn't require linking.
GLIBCXX_CHECK_STDIO_PROTO
GLIBCXX_CHECK_MATH11_PROTO
GLIBCXX_CHECK_SYSTEM_ERROR
GLIBCXX_CHECK_UCHAR_H
# For the streamoff typedef.

23
libstdc++-v3/testsuite/19_diagnostics/headers/system_error/93151.cc Normal file
View File

@ -0,0 +1,23 @@
// { dg-do compile { target c++11 } }
// Copyright (C) 2020 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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, or (at your option)
// any later version.
// This library 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.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// PR libstdc++/93151
#undef _XOPEN_SOURCE
#define _XOPEN_SOURCE 600
#include <system_error>

32
libstdc++-v3/testsuite/19_diagnostics/headers/system_error/errc_std_c++0x.cc
View File

@ -34,7 +34,7 @@ void test01()
TEST_ERRC(bad_address);
TEST_ERRC(bad_file_descriptor);
#ifdef _GLIBCXX_HAVE_EBADMSG
#ifdef EBADMSG
TEST_ERRC(bad_message);
#endif
@ -54,7 +54,7 @@ void test01()
TEST_ERRC(function_not_supported);
TEST_ERRC(host_unreachable);
#ifdef _GLIBCXX_HAVE_EIDRM
#ifdef EIDRM
TEST_ERRC(identifier_removed);
#endif
@ -72,23 +72,23 @@ void test01()
TEST_ERRC(no_buffer_space);
TEST_ERRC(no_child_process);
#ifdef _GLIBCXX_HAVE_ENOLINK
#ifdef ENOLINK
TEST_ERRC(no_link);
#endif
TEST_ERRC(no_lock_available);
#ifdef _GLIBCXX_HAVE_ENODATA
#ifdef ENODATA
TEST_ERRC(no_message_available);
#endif
#ifdef _GLIBCXX_HAVE_ENOMSG
#ifdef ENOMSG
TEST_ERRC(no_message);
#endif
TEST_ERRC(no_protocol_option);
TEST_ERRC(no_space_on_device);
#ifdef _GLIBCXX_HAVE_ENOSR
#ifdef ENOSR
TEST_ERRC(no_stream_resources);
#endif
@ -99,15 +99,15 @@ void test01()
TEST_ERRC(not_a_directory);
TEST_ERRC(not_a_socket);
#ifdef _GLIBCXX_HAVE_ENOSTR
#ifdef ENOSTR
TEST_ERRC(not_a_stream);
#endif
TEST_ERRC(not_connected);
TEST_ERRC(not_connected);
TEST_ERRC(not_enough_memory);
TEST_ERRC(not_supported);
#ifdef _GLIBCXX_HAVE_ECANCELED
#ifdef ECANCELED
TEST_ERRC(operation_canceled);
#endif
@ -116,31 +116,31 @@ void test01()
TEST_ERRC(operation_not_supported);
TEST_ERRC(operation_would_block);
#ifdef _GLIBCXX_HAVE_EOWNERDEAD
#ifdef EOWNERDEAD
TEST_ERRC(owner_dead);
#endif
TEST_ERRC(permission_denied);
#ifdef _GLIBCXX_HAVE_EPROTO
#ifdef EPROTO
TEST_ERRC(protocol_error);
#endif
TEST_ERRC(protocol_not_supported);
TEST_ERRC(read_only_file_system);
TEST_ERRC(resource_deadlock_would_occur);
TEST_ERRC(resource_unavailable_try_again);
TEST_ERRC(resource_unavailable_try_again);
TEST_ERRC(result_out_of_range);
#ifdef _GLIBCXX_HAVE_ENOTRECOVERABLE
#ifdef ENOTRECOVERABLE
TEST_ERRC(state_not_recoverable);
#endif
#ifdef _GLIBCXX_HAVE_ETIME
#ifdef ETIME
TEST_ERRC(stream_timeout);
#endif
#ifdef _GLIBCXX_HAVE_ETXTBSY
#ifdef ETXTBSY
TEST_ERRC(text_file_busy);
#endif
@ -150,7 +150,7 @@ void test01()
TEST_ERRC(too_many_links);
TEST_ERRC(too_many_symbolic_link_levels);
#ifdef _GLIBCXX_HAVE_EOVERFLOW
#ifdef EOVERFLOW
TEST_ERRC(value_too_large);
#endif