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[pull] master from libfuse:master - #64
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The kernel mount API syscalls (fsopen/fsconfig/fsmount/move_mount) landed in Linux 5.2, but libc wrapper functions can lag behind - e.g. glibc added them only in 2.36. RHEL9-family distros with an older glibc but a new-enough kernel (Rocky, RHEL, AlmaLinux, CentOS Stream, Oracle Linux 9 all ship glibc 2.34) fail the existing meson capability check even though the kernel itself supports the syscalls. Detect this with two independent meson checks: one confirms the kernel headers declare the API, the other confirms libc provides the wrapper functions. When the headers are present but libc isn't, mount_fsmount.c supplies its own syscall()-based wrappers, and it defines any mount API constants a partial uapi header omits so the build never depends on the system header being complete. Neither check names a distro or a libc version, so the fallback engages for any libc/distro with the same gap, and it stays correct under cross-compilation since it is a real compile+link probe rather than a host-OS string match. Changes by Bernd: reworked the original Rocky-9-specific detection to be portable - replaced the /etc/os-release distro-name match with the two independent header and libc probes above. Signed-off-by: kchen <kchen@ddn.com> Signed-off-by: Bernd Schubert <bernd@bsbernd.com>
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