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>
---
 .gitignore                       | 1 +
 Makefile                         | 5 -----
 Makefile.objs                    | 1 -
 contrib/rdmacm-mux/Makefile.objs | 3 ---
 contrib/rdmacm-mux/meson.build   | 6 ++++++
 meson.build                      | 2 ++
 6 files changed, 9 insertions(+), 9 deletions(-)
 delete mode 100644 contrib/rdmacm-mux/Makefile.objs
 create mode 100644 contrib/rdmacm-mux/meson.build

diff --git a/.gitignore b/.gitignore
index eff317c..656db05 100644
--- a/.gitignore
+++ b/.gitignore
@@ -63,6 +63,7 @@
 /qemu-version.h.tmp
 /module_block.h
 /scsi/qemu-pr-helper
+/contrib/rdmacm-mux/rdmacm-mux
 /contrib/vhost-user-scsi/vhost-user-scsi
 /contrib/vhost-user-blk/vhost-user-blk
 /fsdev/virtfs-proxy-helper
diff --git a/Makefile b/Makefile
index dd88634..a11df79 100644
--- a/Makefile
+++ b/Makefile
@@ -322,7 +322,6 @@ dummy := $(call unnest-vars,, \
                 elf2dmp-obj-y \
                 ivshmem-client-obj-y \
                 ivshmem-server-obj-y \
-                rdmacm-mux-obj-y \
                 vhost-user-input-obj-y \
                 vhost-user-gpu-obj-y \
                 qga-vss-dll-obj-y \
@@ -510,10 +509,6 @@ ivshmem-server$(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 1ea1d20..ca77ad1 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -114,7 +114,6 @@ 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..8451756
--- /dev/null
+++ b/contrib/rdmacm-mux/meson.build
@@ -0,0 +1,6 @@
+if config_host['CONFIG_PVRDMA'] == 'y'
+  # 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 2d29418..b778dda 100644
--- a/meson.build
+++ b/meson.build
@@ -1,4 +1,5 @@
 project('qemu', 'c', meson_version: '>=0.50.999')
+cc = meson.get_compiler('c')
 
 kconfig = import('unstable-kconfig')
 ss = import('sourceset')
@@ -148,5 +149,6 @@ libqemuutil = static_library('qemuutil',
 # Other build targets
 
 subdir('contrib/libvhost-user')
+subdir('contrib/rdmacm-mux')
 subdir('contrib/vhost-user-blk')
 subdir('contrib/vhost-user-scsi')
-- 
1.8.3.1