meson: Prepare to accept per-binary TargetInfo structure implementation

If a file defining the binary TargetInfo structure is available,
link with it. Otherwise keep using the stub.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20251021205741.57109-6-philmd@linaro.org>

MAINTAINERS

@@ -2007,6 +2007,7 @@ M: Philippe Mathieu-Daudé <philmd@linaro.org>
 S: Supported
 F: include/qemu/target-info*.h
 F: target-info*.c
+F: configs/targets/*.c
 
 Xtensa Machines
 ---------------

configs/targets/meson.build

@@ -0,0 +1,4 @@
+foreach target : [
+  ]
+  config_target_info += {target : files(target + '.c')}
+endforeach

meson.build

@@ -3312,6 +3312,7 @@ config_devices_h = {}
 config_target_h = {}
 config_target_mak = {}
 config_base_arch_mak = {}
+config_target_info = {}
 
 disassemblers = {
   'alpha' : ['CONFIG_ALPHA_DIS'],
@@ -3912,9 +3913,9 @@ specific_ss.add(files('page-vary-target.c'))
 
 common_ss.add(files('target-info.c'))
 system_ss.add(files('target-info-qom.c'))
-specific_ss.add(files('target-info-stub.c'))
 
 subdir('backends')
+subdir('configs/targets')
 subdir('disas')
 subdir('migration')
 subdir('monitor')
@@ -4365,6 +4366,12 @@ foreach target : target_dirs
     arch_srcs += gdbstub_xml
   endif
 
+  if target in config_target_info
+    arch_srcs += config_target_info[target]
+  else
+    arch_srcs += files('target-info-stub.c')
+  endif
+
   t = target_arch[target_base_arch].apply(config_target, strict: false)
   arch_srcs += t.sources()
   arch_deps += t.dependencies()