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libvirt/config-post.h

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Don't link virt-login-shell against libvirt.so (CVE-2013-4400) The libvirt.so library has far too many library deps to allow linking against it from setuid programs. Those libraries can do stuff in __attribute__((constructor) functions which is not setuid safe. The virt-login-shell needs to link directly against individual files that it uses, with all library deps turned off except for libxml2 and libselinux. Create a libvirt-setuid-rpc-client.la library which is linked to by virt-login-shell. A config-post.h file allows this library to disable all external deps except libselinux and libxml2. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2013-10-10 16:09:08 +04:00
/*
* Copyright (C) 2013 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
Require use of GCC 4.4 or CLang compilers We only ever test libvirt with GCC or CLang which provides a GCC compatible compilation environment. Between them, these compilers cover every important operating system platform, even Windows. Mandate their use to make it explicit that we don't care about compilers like Microsoft VCC or other UNIX vendor C compilers. GCC 4.4 was picked as the baseline, since RHEL-6 ships 4.4.7 and that lets us remove a large set of checks. There is a slight issue that CLang reports itself as GCC 4.2, so we must also check if __clang__ is defined. We could check a particular CLang version too, but that would require someone to figure out a suitable min version which is fun because OS-X reports totally different CLang version numbers from CLang builds on Linux/BSD Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-07-05 12:35:32 +03:00
#ifndef __GNUC__
build: bump min required gcc to 4.8 The previous bump to 4.4 was done in: commit 24241c236e5e0b0b51a33ba539b40f5429a0df0e Author: Daniel P. Berrange <berrange@redhat.com> Date: Wed Jul 5 10:35:32 2017 +0100 Require use of GCC 4.4 or CLang compilers with 4.4 picked due to RHEL-6. Since we dropped RHEL-6, the next oldest distro is RHEL-7 (4.8.5), and thus we pick 4.8 as the new min. Reviewed-by: Andrea Bolognani <abologna@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2019-07-30 16:07:24 +03:00
# error "Libvirt requires GCC >= 4.8, or CLang"
Require use of GCC 4.4 or CLang compilers We only ever test libvirt with GCC or CLang which provides a GCC compatible compilation environment. Between them, these compilers cover every important operating system platform, even Windows. Mandate their use to make it explicit that we don't care about compilers like Microsoft VCC or other UNIX vendor C compilers. GCC 4.4 was picked as the baseline, since RHEL-6 ships 4.4.7 and that lets us remove a large set of checks. There is a slight issue that CLang reports itself as GCC 4.2, so we must also check if __clang__ is defined. We could check a particular CLang version too, but that would require someone to figure out a suitable min version which is fun because OS-X reports totally different CLang version numbers from CLang builds on Linux/BSD Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-07-05 12:35:32 +03:00
#endif
gnulib: add getopt module Unconditionally use gnulib's getopt module. This is needed by the bhyve driver to provide a reentrant interface for getopt. Several gnulib headers rely on features.h being included by ctype.h to provide __GNUC_PREREQ, but on systems without glibc, this is not provided. In these cases __GNUC_PREREQ gets redefined to 0, which causes build errors from checks in src/internal.h. Therefore, define __GNUC_PREREQ as early as possible. config-post.h is probably the first header that is included, before any other headers.
2016-06-09 03:50:35 +03:00
/*
Remove duplicate define of __GNUC_PREREQ Back in this commit: commit b436a8ae5ccb04f8cf893d882d52ab5efc713307 Author: Fabian Freyer <fabian.freyer@physik.tu-berlin.de> Date: Thu Jun 9 00:50:35 2016 +0000 gnulib: add getopt module config-post.h was modified to define __GNUC_PREREQ, but the original definition was never removed from internal.h, and that is now dead code since config.h is always the first file included. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-07-05 12:59:53 +03:00
* Define __GNUC_PREREQ to a sane default if it isn't yet defined.
gnulib: add getopt module Unconditionally use gnulib's getopt module. This is needed by the bhyve driver to provide a reentrant interface for getopt. Several gnulib headers rely on features.h being included by ctype.h to provide __GNUC_PREREQ, but on systems without glibc, this is not provided. In these cases __GNUC_PREREQ gets redefined to 0, which causes build errors from checks in src/internal.h. Therefore, define __GNUC_PREREQ as early as possible. config-post.h is probably the first header that is included, before any other headers.
2016-06-09 03:50:35 +03:00
* This is done here so that it's included as early as possible; gnulib relies
* on this to be defined in features.h, which should be included from ctype.h.
* This doesn't happen on many non-glibc systems.
Remove duplicate define of __GNUC_PREREQ Back in this commit: commit b436a8ae5ccb04f8cf893d882d52ab5efc713307 Author: Fabian Freyer <fabian.freyer@physik.tu-berlin.de> Date: Thu Jun 9 00:50:35 2016 +0000 gnulib: add getopt module config-post.h was modified to define __GNUC_PREREQ, but the original definition was never removed from internal.h, and that is now dead code since config.h is always the first file included. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-07-05 12:59:53 +03:00
* When __GNUC_PREREQ is not defined, gnulib defines it to 0, which breaks things.
gnulib: add getopt module Unconditionally use gnulib's getopt module. This is needed by the bhyve driver to provide a reentrant interface for getopt. Several gnulib headers rely on features.h being included by ctype.h to provide __GNUC_PREREQ, but on systems without glibc, this is not provided. In these cases __GNUC_PREREQ gets redefined to 0, which causes build errors from checks in src/internal.h. Therefore, define __GNUC_PREREQ as early as possible. config-post.h is probably the first header that is included, before any other headers.
2016-06-09 03:50:35 +03:00
*/
Require use of GCC 4.4 or CLang compilers We only ever test libvirt with GCC or CLang which provides a GCC compatible compilation environment. Between them, these compilers cover every important operating system platform, even Windows. Mandate their use to make it explicit that we don't care about compilers like Microsoft VCC or other UNIX vendor C compilers. GCC 4.4 was picked as the baseline, since RHEL-6 ships 4.4.7 and that lets us remove a large set of checks. There is a slight issue that CLang reports itself as GCC 4.2, so we must also check if __clang__ is defined. We could check a particular CLang version too, but that would require someone to figure out a suitable min version which is fun because OS-X reports totally different CLang version numbers from CLang builds on Linux/BSD Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-07-05 12:35:32 +03:00
#ifndef __GNUC_PREREQ
Remove backslash alignment attempts Right-aligning backslashes when defining macros or using complex commands in Makefiles looks cute, but as soon as any changes is required to the code you end up with either distractingly broken alignment or unnecessarily big diffs where most of the changes are just pushing all backslashes a few characters to one side. Generated using $ git grep -El '[[:blank:]][[:blank:]]\\$' | \ grep -E '*\.([chx]|am|mk)$$' | \ while read f; do \ sed -Ei 's/[[:blank:]]*[[:blank:]]\\$/ \\/g' "$f"; \ done Signed-off-by: Andrea Bolognani <abologna@redhat.com>
2017-11-03 15:09:47 +03:00
# define __GNUC_PREREQ(maj, min) \
Require use of GCC 4.4 or CLang compilers We only ever test libvirt with GCC or CLang which provides a GCC compatible compilation environment. Between them, these compilers cover every important operating system platform, even Windows. Mandate their use to make it explicit that we don't care about compilers like Microsoft VCC or other UNIX vendor C compilers. GCC 4.4 was picked as the baseline, since RHEL-6 ships 4.4.7 and that lets us remove a large set of checks. There is a slight issue that CLang reports itself as GCC 4.2, so we must also check if __clang__ is defined. We could check a particular CLang version too, but that would require someone to figure out a suitable min version which is fun because OS-X reports totally different CLang version numbers from CLang builds on Linux/BSD Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-07-05 12:35:32 +03:00
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
#endif
build: set min version for CLang to 3.4 / XCode CLang to 5.1 We have a strong check for GCC >= 4.8, but don't validate any version number for CLang historically. This defines the min CLang to be 3.4 which is what is available for RHEL-7. macOS uses a different versioning scheme for CLang, based off XCode versions. There is a mapping recorded at https://en.wikipedia.org/wiki/Xcode#Toolchain_versions Here we see upstream CLang 3.4 corresponds to XCode 5.1 XCode 5.1 is available for macOS 10.8.4 or later which trivially satisfies our platform support matrix requirements. All these versions match what QEMU declares for its min GCC and CLang checks. Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2019-12-23 17:06:46 +03:00
#if defined(__clang_major__) && defined(__clang_minor__)
# ifdef __apple_build_version__
# if __clang_major__ < 5 || (__clang_major__ == 5 && __clang_minor__ < 1)
# error You need at least XCode Clang v5.1 to compile QEMU
# endif
# else
# if __clang_major__ < 3 || (__clang_major__ == 3 && __clang_minor__ < 4)
# error You need at least Clang v3.4 to compile QEMU
# endif
# endif
#elif defined(__GNUC__) && defined(__GNUC_MINOR__)
# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8)
# error You need at least GCC v4.8 to compile QEMU
# endif
#else
# error You either need at least GCC 4.8 or Clang 3.4 or XCode Clang 5.1 to compile libvirt
gnulib: add getopt module Unconditionally use gnulib's getopt module. This is needed by the bhyve driver to provide a reentrant interface for getopt. Several gnulib headers rely on features.h being included by ctype.h to provide __GNUC_PREREQ, but on systems without glibc, this is not provided. In these cases __GNUC_PREREQ gets redefined to 0, which causes build errors from checks in src/internal.h. Therefore, define __GNUC_PREREQ as early as possible. config-post.h is probably the first header that is included, before any other headers.
2016-06-09 03:50:35 +03:00
#endif
util: introduce compile time API version checking GLib header files annotate every API with a version number. It is possible to define some constants before including glib.h which will result in useful compile time warnings. Setting GLIB_VERSION_MIN_REQUIRED will result in a warning if libvirt uses an API that was deprecated in the declared version, or before. Such API usage should be rewritten to use the documented new replacement API. Setting GLIB_VERSION_MAX_ALLOWED will result in a warning if libvirt uses an API that was not introduced until a version of GLib that's newer than our minimum declared version. This avoids accidentally using functionality that is not available on some supported platforms. Reviewed-by: Pavel Hrdina <phrdina@redhat.com> Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2020-01-03 20:54:12 +03:00
/* Ask for warnings for anything that was marked deprecated in
* the defined version, or before. It is a candidate for rewrite.
*/
#define GLIB_VERSION_MIN_REQUIRED GLIB_VERSION_2_48
/* Ask for warnings if code tries to use function that did not
* exist in the defined version. These risk breaking builds
*/
#define GLIB_VERSION_MAX_ALLOWED GLIB_VERSION_2_48
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