system: Extract target-specific globals to their own compilation unit

We shouldn't use target specific globals for machine properties.
These ones could be desugarized, as explained in [*]. While
certainly doable, not trivial nor my priority for now. Just move
them to a different file to clarify they are *globals*, like the
generic globals residing in system/globals.c.

Since arch_init.c was introduced using the MIT license (see commit
ad96090a01d), retain the same license for the new globals-target.c
file.

[*] https://lore.kernel.org/qemu-devel/e514d6db-781d-4afe-b057-9046c70044dc@redhat.com/

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250305005225.95051-2-philmd@linaro.org>

system/arch_init.c

@@ -24,18 +24,4 @@
 #include "qemu/osdep.h"
 #include "system/arch_init.h"
 
-#ifdef TARGET_SPARC
-int graphic_width = 1024;
-int graphic_height = 768;
-int graphic_depth = 8;
-#elif defined(TARGET_M68K)
-int graphic_width = 800;
-int graphic_height = 600;
-int graphic_depth = 8;
-#else
-int graphic_width = 800;
-int graphic_height = 600;
-int graphic_depth = 32;
-#endif
-
 const uint32_t arch_type = QEMU_ARCH;

system/globals-target.c

@@ -0,0 +1,24 @@
+/*
+ * Global variables that should not exist (target specific)
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "qemu/osdep.h"
+#include "system/system.h"
+
+#ifdef TARGET_SPARC
+int graphic_width = 1024;
+int graphic_height = 768;
+int graphic_depth = 8;
+#elif defined(TARGET_M68K)
+int graphic_width = 800;
+int graphic_height = 600;
+int graphic_depth = 8;
+#else
+int graphic_width = 800;
+int graphic_height = 600;
+int graphic_depth = 32;
+#endif

system/meson.build

@@ -1,6 +1,7 @@
 specific_ss.add(when: 'CONFIG_SYSTEM_ONLY', if_true: [files(
   'arch_init.c',
   'ioport.c',
+  'globals-target.c',
   'memory.c',
   'physmem.c',
 )])