Commit 8c00f56fca for qemu.org

commit 8c00f56fcaf60f42474ca277e86c95f55941aa0d
Author: Richard Henderson <richard.henderson@linaro.org>
Date:   Wed Dec 3 14:04:21 2025 +0000

    tcg/tci: Disable -Wundef FFI_GO_CLOSURES warning

    Since we build TCI with FFI (commit 22f15579fa1 "tcg: Build ffi data
    structures for helpers") we get on Darwin:

      In file included from ../../tcg/tci.c:22:
      In file included from include/tcg/helper-info.h:13:
      /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/ffi/ffi.h:483:5: warning: 'FFI_GO_CLOSURES' is not defined, evaluates to 0 [-Wundef]
        483 | #if FFI_GO_CLOSURES
            |     ^
      1 warning generated.

    This was fixed in upstream libffi in 2023, but not backported to MacOSX.
    Simply disable the warning locally.

    Reported-by: Philippe Mathieu-Daudé <philmd@linaro.org>
    Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
    Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
    Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/include/tcg/helper-info.h b/include/tcg/helper-info.h
index 909fe73afa..49a27e4eae 100644
--- a/include/tcg/helper-info.h
+++ b/include/tcg/helper-info.h
@@ -10,7 +10,19 @@
 #define TCG_HELPER_INFO_H

 #ifdef CONFIG_TCG_INTERPRETER
+/*
+ * MacOSX 15 uses an old version of libffi which contains
+ *   #if FFI_GO_CLOSURES
+ * but does not define that in <ffitarget.h>, included from <ffi.h>.
+ * This was fixed upstream with
+ *   https://github.com/libffi/libffi/commit/c23e9a1c
+ * We don't care about go closures one way or the other;
+ * just suppress the warning.
+ */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wundef"
 #include <ffi.h>
+#pragma GCC diagnostic pop
 #endif
 #include "tcg-target-reg-bits.h"