[PATCH] linux-user: Remove unnecessary static assert involving __SIGRTMAX

[Michael Forney]

Since "linux-user: fix use of SIGRTMIN" (6bc024e7), qemu removed
use of __SIGRTMAX except for in this QEMU_BUILD_BUG_ON assert.
Presumably, this check is to ensure that the loop in signal_table_init
from SIGRTMIN to SIGRTMAX falls within the bounds of
host_to_target_signal_table (_NSIG).

However, _NSIG is already defined to be the one larger than the
largest signal supported by the system (as specified in the upcoming
POSIX revision[0]), so the check is unnecessary.

musl libc does not define __SIGRTMAX, so removing this check fixes
one of the last remaining errors when building qemu.

[0] https://www.austingroupbugs.net/view.php?id=741

Signed-off-by: Michael Forney <mforney@mforney.org>
---
If you prefer, I can send an alternate patch to leave the
QEMU_BUILD_BUG_ON, but guard it by #ifdef __SIGRTMAX.

 linux-user/signal.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/linux-user/signal.c b/linux-user/signal.c
index 9016896dcd..6f62f2b528 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -38,7 +38,6 @@ static void host_signal_handler(int host_signum, siginfo_t 
*info,
  * Signal number 0 is reserved for use as kill(pid, 0), to test whether
  * a process exists without sending it a signal.
  */
-QEMU_BUILD_BUG_ON(__SIGRTMAX + 1 != _NSIG);
 static uint8_t host_to_target_signal_table[_NSIG] = {
     [SIGHUP] = TARGET_SIGHUP,
     [SIGINT] = TARGET_SIGINT,
-- 
2.31.1