meson: compile bundled device trees

If dtc is available, compile the .dts files in the pc-bios directory
instead of using the precompiled binaries.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

pc-bios/Makefile

-#
-# NOTE: only compilable with x86 cross compile tools
-#
-include ../config-host.mak
-
-DEFINES=
-
-TARGETS=
-
-all: $(TARGETS)
-
-%.o: %.S
-	$(CC) $(DEFINES) -c -o $@ $<
-
-%.dtb: %.dts
-	dtc -I dts -O dtb -o $@ $<
-
-clean:
-	rm -f $(TARGETS) *.o *~

pc-bios/meson.build

@@ -57,10 +57,6 @@ blobs = [
   'efi-e1000e.rom',
   'efi-vmxnet3.rom',
   'qemu-nsis.bmp',
-  'bamboo.dtb',
-  'canyonlands.dtb',
-  'petalogix-s3adsp1800.dtb',
-  'petalogix-ml605.dtb',
   'multiboot.bin',
   'multiboot_dma.bin',
   'linuxboot.bin',
@@ -84,6 +80,27 @@ blobs = [
   'vof-nvram.bin',
 ]
 
+dtc = find_program('dtc', required: false)
+foreach f : [
+  'bamboo.dts',
+  'canyonlands.dts',
+  'petalogix-s3adsp1800.dts',
+  'petalogix-ml605.dts',
+]
+  out = fs.replace_suffix(f, '.dtb')
+  if dtc.found()
+    custom_target(f,
+        build_by_default: have_system,
+        input: files(f),
+        output: out,
+        install: get_option('install_blobs'),
+        install_dir: qemu_datadir,
+        command: [ dtc, '-I', 'dts', '-O', 'dtb', '-o', '@OUTPUT@', '@INPUT0@' ])
+  else
+    blobs += out
+  endif
+endforeach
+
 if get_option('install_blobs')
   install_data(blobs, install_dir: qemu_datadir)
 endif