From 96acfb1f2552c24af6b3ed886daabe2bd3ceff2d Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Tue, 1 Jun 2021 09:54:10 +0200
Subject: [PATCH] meson: allow optional dependencies for block modules

Right now all dependencies for block modules are passed to
module_ss.add(when: ...), so they are mandatory.  In the next patch we
will need to add a libm dependency to a module, but libm does not exist
on all systems.  So, modify the creation of module_ss and modsrc so that
dependencies can also be passed to module_ss.add(if_true: ...).

While touching the array, remove the useless dependency of the curl
module on glib.  glib is always linked in QEMU and in fact all other
block modules also need it, but they don't have to specify it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 block/meson.build | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/block/meson.build b/block/meson.build
index e687c54dbc..9e3388f633 100644
--- a/block/meson.build
+++ b/block/meson.build
@@ -71,19 +71,19 @@ block_modules = {}
 
 modsrc = []
 foreach m : [
-  [curl, 'curl', [curl, glib], 'curl.c'],
-  [glusterfs, 'gluster', glusterfs, 'gluster.c'],
-  [libiscsi, 'iscsi', libiscsi, 'iscsi.c'],
-  [libnfs, 'nfs', libnfs, 'nfs.c'],
-  [libssh, 'ssh', libssh, 'ssh.c'],
-  [rbd, 'rbd', rbd, 'rbd.c'],
+  [curl, 'curl', files('curl.c')],
+  [glusterfs, 'gluster', files('gluster.c')],
+  [libiscsi, 'iscsi', files('iscsi.c')],
+  [libnfs, 'nfs', files('nfs.c')],
+  [libssh, 'ssh', files('ssh.c')],
+  [rbd, 'rbd', files('rbd.c')],
 ]
   if m[0].found()
-    if enable_modules
-      modsrc += files(m[3])
-    endif
     module_ss = ss.source_set()
-    module_ss.add(when: m[2], if_true: files(m[3]))
+    module_ss.add(when: m[0], if_true: m[2])
+    if enable_modules
+      modsrc += module_ss.all_sources()
+    endif
     block_modules += {m[1] : module_ss}
   endif
 endforeach