9bb8a4091c
Many of these typedefs are the same across all architectures or can be set based on an architecture-independent compiler-provided macro (e.g. __SIZEOF_SIZE_T__). These macros have been available since GCC 4.6 and Clang sometime before 3.0 (godbolt.org does not have any older clang versions installed). I originally considered using the compiler-provided `__FOO_TYPE__` directly. However, in order to do so we have to check that those match the previous typedef exactly (not just that they have the same size) since any change would be an ABI break. For example, changing `long` to `long long` results in different C++ name mangling. Additionally, Clang and GCC disagree on the underlying type for some of (u)int*_fast_t types, so this change only moves the definitions that are identical across all architectures and does not touch those types. This de-deduplication will allow us to have a smaller diff downstream in CheriBSD: we only have to only change the (u)intptr_t definition in sys/_types.h in CheriBSD instead of having to change machine/_types.h for all CHERI-enabled architectures (currently RISC-V, AArch64 and MIPS). Reviewed By: imp, kib Differential Revision: https://reviews.freebsd.org/D29895 |
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