qemu --static user build fails with fedora rawhide glibc-2.30.9000

[Cole Robinson]

Building qemu latest git 654efcb511d on fedora rawhide fails with this configure line:

./configure \
 --static \
 --disable-system \
 --enable-linux-user \
 --disable-werror \
 --disable-tools \
 --disable-capstone

make fails with:

/usr/bin/ld: linux-user/syscall.o: in function `do_syscall1':
/root/qemu.git/linux-user/syscall.c:7769: undefined reference to `stime'
collect2: error: ld returned 1 exit status

Seems related to this glibc change: https://sourceware.org/git/?p=glibc.git;a=commit;h=12cbde1dae6fa4a9a792b64564c7e0debf7544cc

...

+* The obsolete function stime is no longer available to newly linked
+ binaries and it has been removed from <time.h> header. This function
+ has been deprecated in favor of clock_settime.
+

# rpm -q glibc
glibc-2.30.9000-17.fc32.x86_64

FWIW there's some other messages but I don't think they are fatal:

/usr/bin/ld: /usr/lib/gcc/x86_64-redhat-linux/9/../../../../lib64/libglib-2.0.a(gutils.c.o): in function `g_get_user_database_entry':
(.text+0x267): warning: Using 'getpwuid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: (.text+0xe0): warning: Using 'getpwnam_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: (.text+0x11e): warning: Using 'getpwuid_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking

Also, --disable-capstone is required to avoid this error, but it is pre-existing, not sure if it's a bug, if so I can file a separate one:

  LINK aarch64-linux-user/qemu-aarch64
/usr/bin/ld: cannot find -lcapstone
collect2: error: ld returned 1 exit status

[Peter Maydell (pmaydell)]

We use stime() to implement the target stime syscall. We should probably switch to using clock_settime(CLOCK_REALTIME, ...) instead, as that's what glibc uses internally now to implement its stime():

https://sourceware.org/git/?p=glibc.git;a=blob;f=time/stime.c;h=6ea3b6dcc1a393b57b69ca24fbfe8023d9095837;hb=12cbde1dae6fa4a9a792b64564c7e0debf7544cc

[Laurent Vivier (laurent-vivier)]

Fixed by 0f1f2d4596ae ("linux-user: remove host stime() syscall")