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774058d729
Now that kernel exports linux/mount.h and includes it on linux/fs.h,
its definitions might clash with glibc exports sys/mount.h. To avoid
the need to rearrange the Linux header to be always after glibc one,
the glibc sys/mount.h is changed to:
1. Undefine the macros also used as enum constants. This covers prior
inclusion of <linux/mount.h> (for instance MS_RDONLY).
2. Include <linux/mount.h> based on the usual __has_include check
(needs to use __has_include ("linux/mount.h") to paper over GCC
bugs.
3. Define enum fsconfig_command only if FSOPEN_CLOEXEC is not defined.
(FSOPEN_CLOEXEC should be a very close proxy.)
4. Define struct mount_attr if MOUNT_ATTR_SIZE_VER0 is not defined.
(Added in the same commit on the Linux side.)
This patch also adds some tests to check if including linux/fs.h and
linux/mount.h after and before sys/mount.h does work.
Checked on x86_64-linux-gnu.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
67 lines
2.3 KiB
Python
Executable File
67 lines
2.3 KiB
Python
Executable File
#!/usr/bin/python3
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# Check if glibc provided sys/mount.h can be used along related kernel
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# headers.
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# Copyright (C) 2022 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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#
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <https://www.gnu.org/licenses/>.
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import argparse
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import sys
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import glibcextract
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def main():
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"""The main entry point."""
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parser = argparse.ArgumentParser(
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description='Check if glibc provided sys/mount.h can be '
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' used along related kernel headers.')
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parser.add_argument('--cc', metavar='CC',
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help='C compiler (including options) to use')
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args = parser.parse_args()
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if glibcextract.compile_c_snippet(
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'#include <linux/mount.h>',
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args.cc).returncode != 0:
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sys.exit (77)
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def check(testname, snippet):
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# Add -Werror to catch macro redefinitions and _ISOMAC to avoid
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# internal glibc definitions.
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r = glibcextract.compile_c_snippet(snippet, args.cc,
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'-Werror -D_ISOMAC')
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if r.returncode != 0:
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print('error: test {}:\n{}'.format(testname, r.output.decode()))
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return r.returncode
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status = max(
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check("sys/mount.h + linux/mount.h",
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"#include <sys/mount.h>\n"
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"#include <linux/mount.h>"),
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check("sys/mount.h + linux/fs.h",
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"#include <sys/mount.h>\n"
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"#include <linux/fs.h>"),
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check("linux/mount.h + sys/mount.h",
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"#include <linux/mount.h>\n"
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"#include <sys/mount.h>"),
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check("linux/fs.h + sys/mount.h",
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"#include <linux/fs.h>\n"
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"#include <sys/mount.h>"))
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sys.exit(status)
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if __name__ == '__main__':
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main()
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