diff options
| author | Daniel P. Berrangé <berrange@redhat.com> | 2022-08-02 12:41:34 -0400 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2022-08-10 18:37:46 +0200 |
| commit | 3cd3df2a9584e6f753bb62a0028bd67124ab5532 (patch) | |
| tree | 15ad7ab6a77d27d7779658bdab7e8966ce3f3cbc | |
| parent | 61b6e67171c602cf6451e4928c9cdcc24c57a485 (diff) | |
linux-user: fix compat with glibc >= 2.36 sys/mount.h
The latest glibc 2.36 has extended sys/mount.h so that it
defines the FSCONFIG_* enum constants. These are historically
defined in linux/mount.h, and thus if you include both headers
the compiler complains:
In file included from /usr/include/linux/fs.h:19,
from ../linux-user/syscall.c:98:
/usr/include/linux/mount.h:95:6: error: redeclaration of 'enum fsconfig_command'
95 | enum fsconfig_command {
| ^~~~~~~~~~~~~~~~
In file included from ../linux-user/syscall.c:31:
/usr/include/sys/mount.h:189:6: note: originally defined here
189 | enum fsconfig_command
| ^~~~~~~~~~~~~~~~
/usr/include/linux/mount.h:96:9: error: redeclaration of enumerator 'FSCONFIG_SET_FLAG'
96 | FSCONFIG_SET_FLAG = 0, /* Set parameter, supplying no value */
| ^~~~~~~~~~~~~~~~~
/usr/include/sys/mount.h:191:3: note: previous definition of 'FSCONFIG_SET_FLAG' with type 'enum fsconfig_command'
191 | FSCONFIG_SET_FLAG = 0, /* Set parameter, supplying no value */
| ^~~~~~~~~~~~~~~~~
...snip...
QEMU doesn't include linux/mount.h, but it does use
linux/fs.h and thus gets linux/mount.h indirectly.
glibc acknowledges this problem but does not appear to
be intending to fix it in the forseeable future, simply
documenting it as a known incompatibility with no
workaround:
https://sourceware.org/glibc/wiki/Release/2.36#Usage_of_.3Clinux.2Fmount.h.3E_and_.3Csys.2Fmount.h.3E
https://sourceware.org/glibc/wiki/Synchronizing_Headers
To address this requires either removing use of sys/mount.h
or linux/fs.h, despite QEMU needing declarations from
both.
This patch removes linux/fs.h, meaning we have to define
various FS_IOC constants that are now unavailable.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Tested-by: Richard W.M. Jones <rjones@redhat.com>
Message-Id: <20220802164134.1851910-1-berrange@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
| -rw-r--r-- | linux-user/syscall.c | 18 | ||||
| -rw-r--r-- | meson.build | 2 |
2 files changed, 20 insertions, 0 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c index ef53feb5ab..f409121202 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -95,7 +95,25 @@ #include <linux/soundcard.h> #include <linux/kd.h> #include <linux/mtio.h> + +#ifdef HAVE_SYS_MOUNT_FSCONFIG +/* + * glibc >= 2.36 linux/mount.h conflicts with sys/mount.h, + * which in turn prevents use of linux/fs.h. So we have to + * define the constants ourselves for now. + */ +#define FS_IOC_GETFLAGS _IOR('f', 1, long) +#define FS_IOC_SETFLAGS _IOW('f', 2, long) +#define FS_IOC_GETVERSION _IOR('v', 1, long) +#define FS_IOC_SETVERSION _IOW('v', 2, long) +#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) +#define FS_IOC32_GETFLAGS _IOR('f', 1, int) +#define FS_IOC32_SETFLAGS _IOW('f', 2, int) +#define FS_IOC32_GETVERSION _IOR('v', 1, int) +#define FS_IOC32_SETVERSION _IOW('v', 2, int) +#else #include <linux/fs.h> +#endif #include <linux/fd.h> #if defined(CONFIG_FIEMAP) #include <linux/fiemap.h> diff --git a/meson.build b/meson.build index 294e9a8f32..30a380752c 100644 --- a/meson.build +++ b/meson.build @@ -1963,6 +1963,8 @@ config_host_data.set('HAVE_OPTRESET', cc.has_header_symbol('getopt.h', 'optreset')) config_host_data.set('HAVE_IPPROTO_MPTCP', cc.has_header_symbol('netinet/in.h', 'IPPROTO_MPTCP')) +config_host_data.set('HAVE_SYS_MOUNT_FSCONFIG', + cc.has_header_symbol('sys/mount.h', 'FSCONFIG_SET_FLAG')) # has_member config_host_data.set('HAVE_SIGEV_NOTIFY_THREAD_ID', |