[all-commits] [llvm/llvm-project] 53f303: [C99] Fix definitions of INTn_C macros (#133916)

[Aaron Ballman via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 53f3031005f78b384845eaf770ec4aac54cae4c3
      https://github.com/llvm/llvm-project/commit/53f3031005f78b384845eaf770ec4aac54cae4c3
  Author: Aaron Ballman <aaron at aaronballman.com>
  Date:   2025-04-02 (Wed, 02 Apr 2025)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/lib/Headers/stdint.h
    M clang/test/C/drs/dr209.c
    M clang/test/Preprocessor/stdint.c

  Log Message:
  -----------
  [C99] Fix definitions of INTn_C macros (#133916)

C99 introduced macros of the form `INTn_C(v)` which expand to a signed
or unsigned integer constant with the specified value `v` and the type
`int_leastN_t`. Clang's initial implementation of these macros used
token pasting to form the integer constants, but this means that users
cannot define a macro named `L`, `U`, `UL`, etc before including
`<stdint.h>` (in freestanding mode, where Clang's header is being used)
because that could form invalid token pasting results. The new
definitions now use the predefined `__INTn_C` macros instead of using
token pasting. This matches the behavior of GCC.

Fixes #85995



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