[PATCH] hw/core: Only build guest-loader if libfdt is available

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Add a Kconfig entry for guest-loader so we can optionally deselect
it (default is built in), and add a Meson dependency on libfdt.

This fixes when building with --disable-fdt:

  /usr/bin/ld: libcommon.fa.p/hw_core_guest-loader.c.o: in function `loader_insert_platform_data':
  hw/core/guest-loader.c:56: undefined reference to `qemu_fdt_add_subnode'
  /usr/bin/ld: hw/core/guest-loader.c:57: undefined reference to `qemu_fdt_setprop'
  /usr/bin/ld: hw/core/guest-loader.c:61: undefined reference to `qemu_fdt_setprop_string_array'
  /usr/bin/ld: hw/core/guest-loader.c:68: undefined reference to `qemu_fdt_setprop_string'
  /usr/bin/ld: hw/core/guest-loader.c:74: undefined reference to `qemu_fdt_setprop_string_array'
  collect2: error: ld returned 1 exit status

Fixes: a33ff6d2c6b ("hw/core: implement a guest-loader to support static hypervisor guests")
Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 hw/core/Kconfig     | 5 +++++
 hw/core/meson.build | 3 +--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/hw/core/Kconfig b/hw/core/Kconfig
index fdf03514d7d..9397503656d 100644
--- a/hw/core/Kconfig
+++ b/hw/core/Kconfig
@@ -11,6 +11,11 @@ config GENERIC_LOADER
     bool
     default y
 
+config GUEST_LOADER
+    bool
+    default y
+    depends on TCG
+
 config OR_IRQ
     bool
 
diff --git a/hw/core/meson.build b/hw/core/meson.build
index 9cd72edf513..59f1605bb07 100644
--- a/hw/core/meson.build
+++ b/hw/core/meson.build
@@ -16,6 +16,7 @@
 common_ss.add(files('cpu.c'))
 common_ss.add(when: 'CONFIG_FITLOADER', if_true: files('loader-fit.c'))
 common_ss.add(when: 'CONFIG_GENERIC_LOADER', if_true: files('generic-loader.c'))
+common_ss.add(when: ['CONFIG_GUEST_LOADER', fdt], if_true: files('guest-loader.c'))
 common_ss.add(when: 'CONFIG_OR_IRQ', if_true: files('or-irq.c'))
 common_ss.add(when: 'CONFIG_PLATFORM_BUS', if_true: files('platform-bus.c'))
 common_ss.add(when: 'CONFIG_PTIMER', if_true: files('ptimer.c'))
@@ -37,8 +38,6 @@
   'clock-vmstate.c',
 ))
 
-softmmu_ss.add(when: 'CONFIG_TCG', if_true: files('guest-loader.c'))
-
 specific_ss.add(when: 'CONFIG_SOFTMMU', if_true: files(
   'machine-qmp-cmds.c',
   'numa.c',
-- 
2.26.2