[PATCH] meson: Clean up some dependencies regarding qemu-system

[Helge Deller <deller@gmx.de>]

Reduce amount of compiled code and installed binaries if just the qemu
utilities such as qemu-img, qemu-io and qemu-nbd have to be built.  This
helps to make those tools easier available on hosts where qemu-system or
qemu-user isn't supported.

Reason for this patch is that qemu fail to build on debian for some
seconday non-release architectures (e.g. hppa, sh4, ia64), as can be
seen here:
https://buildd.debian.org/status/package.php?p=qemu&suite=sid
This patch helps to clean up the build so that these tools
can be provided on those platforms in future.

Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/docs/meson.build b/docs/meson.build
index 9136fed3b7..cfbde168b7 100644
--- a/docs/meson.build
+++ b/docs/meson.build
@@ -49,7 +49,7 @@ if build_docs
         'qemu-trace-stap.1': (stap.found() ? 'man1' : ''),
         'virtfs-proxy-helper.1': (have_virtfs_proxy_helper ? 'man1' : ''),
         'virtiofsd.1': (have_virtiofsd ? 'man1' : ''),
-        'qemu.1': 'man1',
+        'qemu.1': (have_system ? 'man1' : ''),
         'qemu-block-drivers.7': 'man7',
         'qemu-cpu-models.7': 'man7'
   }
diff --git a/meson.build b/meson.build
index 5c6b5a1c75..fe4c9c83bb 100644
--- a/meson.build
+++ b/meson.build
@@ -3021,7 +3021,6 @@ subdir('util')
 subdir('qom')
 subdir('authz')
 subdir('crypto')
-subdir('ui')
 subdir('hw')
 subdir('gdbstub')

@@ -3060,9 +3059,10 @@ if have_system or have_user
                          arguments: ['@INPUT@', '@EXTRA_ARGS@', '-o', '@OUTPUT@'])
   subdir('libdecnumber')
   subdir('target')
+  subdir('ui')
+  subdir('audio')
 endif

-subdir('audio')
 subdir('io')
 subdir('chardev')
 subdir('fsdev')
@@ -3581,7 +3581,7 @@ subdir('qga')

 # Don't build qemu-keymap if xkbcommon is not explicitly enabled
 # when we don't build tools or system
-if xkbcommon.found()
+if xkbcommon.found() and have_system
   # used for the update-keymaps target, so include rules even if !have_tools
   qemu_keymap = executable('qemu-keymap', files('qemu-keymap.c', 'ui/input-keymap.c') + genh,
                            dependencies: [qemuutil, xkbcommon], install: have_tools)
@@ -3596,7 +3596,9 @@ if have_tools
                dependencies: [blockdev, qemuutil, gnutls, selinux],
                install: true)

-  subdir('storage-daemon')
+  if have_system
+    subdir('storage-daemon')
+  endif
   subdir('contrib/rdmacm-mux')
   subdir('contrib/elf2dmp')

@@ -3611,7 +3613,7 @@ if have_tools
     subdir('contrib/vhost-user-scsi')
   endif

-  if targetos == 'linux'
+  if targetos == 'linux' and have_system
     executable('qemu-bridge-helper', files('qemu-bridge-helper.c'),
                dependencies: [qemuutil, libcap_ng],
                install: true,
diff --git a/qapi/meson.build b/qapi/meson.build
index fbdb442fdf..4a499db441 100644
--- a/qapi/meson.build
+++ b/qapi/meson.build
@@ -51,12 +51,12 @@ qapi_all_modules = [
   'transaction',
   'virtio',
   'yank',
+  'qdev',
 ]
 if have_system
   qapi_all_modules += [
     'acpi',
     'audio',
-    'qdev',
     'pci',
     'rdma',
     'rocker',
diff --git a/tests/meson.build b/tests/meson.build
index 8e318ec513..a63a7de9f0 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -1,5 +1,7 @@
 subdir('bench')
-subdir('qemu-iotests')
+if have_system
+  subdir('qemu-iotests')
+endif

 test_qapi_outputs = [
   'qapi-builtin-types.c',
diff --git a/tools/meson.build b/tools/meson.build
index 10eb3a043f..740d572a94 100644
--- a/tools/meson.build
+++ b/tools/meson.build
@@ -5,7 +5,7 @@ have_virtiofsd = get_option('virtiofsd') \
              error_message: 'virtiofsd requires libcap-ng-devel and seccomp-devel') \
     .require(have_vhost_user,
              error_message: 'virtiofsd needs vhost-user-support') \
-    .disable_auto_if(not have_tools and not have_system) \
+    .disable_auto_if(not have_system) \
     .allowed()

 if have_virtiofsd