A. Jiang 6abe19ac58 [clang] Predefine _CRT_USE_BUILTIN_OFFSETOF in MS-compatible modes (#127568) ...

This patch makes Clang predefine `_CRT_USE_BUILTIN_OFFSETOF` in
MS-compatible modes. The macro can make the `offsetof` provided by MS
UCRT's `<stddef.h>` to select the `__builtin_offsetof` version, so with
it Clang (Clang-cl) can directly consume UCRT's `offsetof`.

MSVC predefines the macro as `1` since at least VS 2017 19.14, but I
think it's also OK to define it in "older" compatible modes.

Fixes #59689.

2025-03-13 14:02:44 +08:00

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