[Buildroot] [PATCH v6 2/6] package/sdl3: disable m68k builds

SDL_alignment_test has a static assertion to ensure that its size is
2 * sizeof(void *), as SDL relies on this layout for its ABI.

Testing the SDL3 package by running:

  $ utils/test-pkg -p sdl3 -T bootlin-m68k-68040-uclibc

raised the following error:

  In file included from src/libm/k_sin.c:1:
  include/SDL3/SDL_stdinc.h:230:42: error: static assertion failed: "sizeof(SDL_alignment_test) == (2 * sizeof(void *))"
    230 | #define SDL_COMPILE_TIME_ASSERT(name, x) _Static_assert(x, #x)
        |                                          ^~~~~~~~~~~~~~
  include/SDL3/SDL_stdinc.h:1187:1: note: in expansion of macro 'SDL_COMPILE_TIME_ASSERT'
   1187 | SDL_COMPILE_TIME_ASSERT(struct_alignment, sizeof(SDL_alignment_test) == (2 * sizeof(void *)));

Since the m68k ABI results in a different structure size, disable m68k
builds.

Fixes: 2dd13e328f11 ("package/sdl3: new package")
Signed-off-by: Dario Binacchi <[email protected]>
---
 package/sdl3/Config.in | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/package/sdl3/Config.in b/package/sdl3/Config.in
index 7bce4ceaba9c..f5ba8b6a016b 100644
--- a/package/sdl3/Config.in
+++ b/package/sdl3/Config.in
@@ -1,5 +1,12 @@
+config BR2_PACKAGE_SDL3_ARCH_SUPPORTS
+	bool
+	default y
+	# Invalid size of the SDL_alignment_test struct on m68k
+	depends on !BR2_m68k
+
 config BR2_PACKAGE_SDL3
 	bool "sdl3"
+	depends on BR2_PACKAGE_SDL3_ARCH_SUPPORTS
 	depends on !BR2_STATIC_LIBS
 	depends on BR2_USE_WCHAR
 	depends on BR2_TOOLCHAIN_HAS_THREADS
@@ -78,4 +85,5 @@ comment "OpenGL ES support needs an OpenGL ES provider"
 endif
 
 comment "sdl3 needs a toolchain w/ dynamic library, threads, wchar"
+	depends on BR2_PACKAGE_SDL3_ARCH_SUPPORTS
 	depends on BR2_STATIC_LIBS || !BR2_TOOLCHAIN_HAS_THREADS || !BR2_USE_WCHAR
-- 
2.43.0

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