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[PULL,2/9] linux-user: Disable static assert involving __SIGRTMAX if it is missing

Message ID 20210621110445.231771-3-laurent@vivier.eu
State New
Headers show
Series [PULL,1/9] linux-user: Set CF_PARALLEL when mapping shared memory | expand

Commit Message

Laurent Vivier June 21, 2021, 11:04 a.m. UTC 
From: Michael Forney <mforney@mforney.org>

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, it is not critical, since _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]).

musl libc does not define __SIGRTMAX, so disabling this check when
it is missing 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>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210526190203.4255-1-mforney@mforney.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 linux-user/signal.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/linux-user/signal.c b/linux-user/signal.c
index 9016896dcda0..0f19c59deee9 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -38,7 +38,9 @@  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.
  */
+#ifdef __SIGRTMAX
 QEMU_BUILD_BUG_ON(__SIGRTMAX + 1 != _NSIG);
+#endif
 static uint8_t host_to_target_signal_table[_NSIG] = {
     [SIGHUP] = TARGET_SIGHUP,
     [SIGINT] = TARGET_SIGINT,