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Re: [PATCH] osdep.h: Remove <sys/signal.h> include


From: Thomas Huth
Subject: Re: [PATCH] osdep.h: Remove <sys/signal.h> include
Date: Wed, 13 Jan 2021 12:44:03 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0

On 27/10/2020 01.38, Michael Forney wrote:
Prior to 2a4b472c3c, sys/signal.h was only included on OpenBSD
(apart from two .c files). The POSIX standard location for this
header is just <signal.h> and in fact, OpenBSD's signal.h includes
sys/signal.h itself.

Unconditionally including <sys/signal.h> on musl causes warnings
for just about every source file:

   /usr/include/sys/signal.h:1:2: warning: #warning redirecting incorrect #include 
<sys/signal.h> to <signal.h> [-Wcpp]
       1 | #warning redirecting incorrect #include <sys/signal.h> to <signal.h>
         |  ^~~~~~~

Since there don't seem to be any platforms which require including
<sys/signal.h> in addition to <signal.h>, and some platforms like
Haiku lack it completely, just remove it.

Tested building on OpenBSD after removing this include.

Signed-off-by: Michael Forney <mforney@mforney.org>
---
  configure            | 10 ----------
  include/qemu/osdep.h |  4 ----
  2 files changed, 14 deletions(-)

diff --git a/configure b/configure
index 55e07c82dd..7b57456052 100755
--- a/configure
+++ b/configure
@@ -3095,13 +3095,6 @@ if check_include "libdrm/drm.h" ; then
      have_drm_h=yes
  fi
-#########################################
-# sys/signal.h check
-have_sys_signal_h=no
-if check_include "sys/signal.h" ; then
-  have_sys_signal_h=yes
-fi
-
  ##########################################
  # VTE probe
@@ -6182,9 +6175,6 @@ fi
  if test "$have_openpty" = "yes" ; then
      echo "HAVE_OPENPTY=y" >> $config_host_mak
  fi
-if test "$have_sys_signal_h" = "yes" ; then
-    echo "HAVE_SYS_SIGNAL_H=y" >> $config_host_mak
-fi
# Work around a system header bug with some kernel/XFS header
  # versions where they both try to define 'struct fsxattr':
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index f9ec8c84e9..a434382c58 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -104,10 +104,6 @@ extern int daemon(int, int);
  #include <setjmp.h>
  #include <signal.h>
-#ifdef HAVE_SYS_SIGNAL_H
-#include <sys/signal.h>
-#endif
-
  #ifndef _WIN32
  #include <sys/wait.h>
  #else


Seems like this felt through the cracks, sorry. Since there have been some changes to the configure scripts, could you please rework your patch and post again, setting qemu-trivial@nongnu.org into CC: so that it gets more attention?

 Thanks,
  Thomas




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