We can use config-host.mak to decide whether the tool has to be built,
apart from that the conversion is straightforward.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 Makefile                         | 5 -----
 Makefile.objs                    | 1 -
 contrib/rdmacm-mux/Makefile.objs | 3 ---
 contrib/rdmacm-mux/meson.build   | 6 ++++++
 meson.build                      | 2 ++
 5 files changed, 8 insertions(+), 9 deletions(-)
 delete mode 100644 contrib/rdmacm-mux/Makefile.objs
 create mode 100644 contrib/rdmacm-mux/meson.build

diff --git a/Makefile b/Makefile
index 3971171..5845a50 100644
--- a/Makefile
+++ b/Makefile
@@ -266,7 +266,6 @@ dummy := $(call unnest-vars,, \
                 elf2dmp-obj-y \
                 ivshmem-client-obj-y \
                 ivshmem-server-obj-y \
-                rdmacm-mux-obj-y \
                 vhost-user-input-obj-y \
                 vhost-user-gpu-obj-y \
                 qga-vss-dll-obj-y \
@@ -464,10 +463,6 @@ ivshmem-server$(EXESUF): $(ivshmem-server-obj-y) $(COMMON_LDADDS)
 	$(call LINK, $^)
 endif
 
-rdmacm-mux$(EXESUF): LIBS += "-libumad"
-rdmacm-mux$(EXESUF): $(rdmacm-mux-obj-y) $(COMMON_LDADDS)
-	$(call LINK, $^)
-
 vhost-user-gpu$(EXESUF): $(vhost-user-gpu-obj-y) contrib/libvhost-user/libvhost-user.a $(COMMON_LDADDS)
 	$(call LINK, $^)
 
diff --git a/Makefile.objs b/Makefile.objs
index 30804f0..f2e8864 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -109,7 +109,6 @@ qga-vss-dll-obj-y = qga/
 elf2dmp-obj-y = contrib/elf2dmp/
 ivshmem-client-obj-$(CONFIG_IVSHMEM) = contrib/ivshmem-client/
 ivshmem-server-obj-$(CONFIG_IVSHMEM) = contrib/ivshmem-server/
-rdmacm-mux-obj-y = contrib/rdmacm-mux/
 vhost-user-input-obj-y = contrib/vhost-user-input/
 vhost-user-gpu-obj-y = contrib/vhost-user-gpu/
 
diff --git a/contrib/rdmacm-mux/Makefile.objs b/contrib/rdmacm-mux/Makefile.objs
deleted file mode 100644
index 3df744a..0000000
--- a/contrib/rdmacm-mux/Makefile.objs
+++ /dev/null
@@ -1,3 +0,0 @@
-ifdef CONFIG_PVRDMA
-rdmacm-mux-obj-y = main.o
-endif
diff --git a/contrib/rdmacm-mux/meson.build b/contrib/rdmacm-mux/meson.build
new file mode 100644
index 0000000..29a9ced
--- /dev/null
+++ b/contrib/rdmacm-mux/meson.build
@@ -0,0 +1,6 @@
+if 'CONFIG_PVRDMA' in config_host
+  # if not found, CONFIG_PVRDMA should not be set
+  libumad = cc.find_library('ibumad', required: true)
+  executable('rdmacm-mux', files('main.c'),
+             dependencies: [glib, libumad])
+endif
diff --git a/meson.build b/meson.build
index 7ad5458..119fcd4 100644
--- a/meson.build
+++ b/meson.build
@@ -194,6 +194,8 @@ qemuutil = declare_dependency(link_with: libqemuutil,
 # Other build targets
 
 if have_tools
+  subdir('contrib/rdmacm-mux')
+
   if 'CONFIG_VHOST_USER' in config_host
     subdir('contrib/libvhost-user')
     subdir('contrib/vhost-user-blk')
-- 
1.8.3.1