configure / meson: Move check for sys/kcov.h to meson.build

This check can be done in a much shorter way in meson.build. And while
we're at it, rename the #define to HAVE_SYS_KCOV_H to match the other
HAVE_someheader_H symbols that we already have.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20201118171052.308191-6-thuth@redhat.com>
[lv: s/signal/kcov/]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

configure

@@ -4402,12 +4402,6 @@ if compile_prog "" "" ; then
   syncfs=yes
 fi
 
-# check for kcov support (kernel must be 4.4+, compiled with certain options)
-kcov=no
-if check_include sys/kcov.h ; then
-    kcov=yes
-fi
-
 # check for btrfs filesystem support (kernel must be 3.9+)
 btrfs=no
 if check_include linux/btrfs.h ; then
@@ -6112,9 +6106,6 @@ fi
 if test "$syncfs" = "yes" ; then
   echo "CONFIG_SYNCFS=y" >> $config_host_mak
 fi
-if test "$kcov" = "yes" ; then
-  echo "CONFIG_KCOV=y" >> $config_host_mak
-fi
 if test "$btrfs" = "yes" ; then
   echo "CONFIG_BTRFS=y" >> $config_host_mak
 fi

linux-user/ioctls.h

@@ -715,7 +715,7 @@
   IOCTL_IGNORE(TIOCSTOP)
 #endif
 
-#ifdef CONFIG_KCOV
+#ifdef HAVE_SYS_KCOV_H
   IOCTL(KCOV_ENABLE, 0, TYPE_NULL)
   IOCTL(KCOV_DISABLE, 0, TYPE_NULL)
   IOCTL(KCOV_INIT_TRACE, IOC_R, TYPE_ULONG)

linux-user/syscall.c

@@ -73,7 +73,7 @@
 #ifdef CONFIG_SENDFILE
 #include <sys/sendfile.h>
 #endif
-#ifdef CONFIG_KCOV
+#ifdef HAVE_SYS_KCOV_H
 #include <sys/kcov.h>
 #endif
 

meson.build

@@ -839,6 +839,7 @@ config_host_data.set('QEMU_VERSION_MICRO', meson.project_version().split('.')[2]
 config_host_data.set('HAVE_DRM_H', cc.has_header('libdrm/drm.h'))
 config_host_data.set('HAVE_PTY_H', cc.has_header('pty.h'))
 config_host_data.set('HAVE_SYS_IOCCOM_H', cc.has_header('sys/ioccom.h'))
+config_host_data.set('HAVE_SYS_KCOV_H', cc.has_header('sys/kcov.h'))
 config_host_data.set('HAVE_SYS_SIGNAL_H', cc.has_header('sys/signal.h'))
 
 ignored = ['CONFIG_QEMU_INTERP_PREFIX'] # actually per-target