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Commit bd974842 authored by Kristina Brooks's avatar Kristina Brooks
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Reland "[Clang][PP] Add the __FILE_NAME__ builtin macro"

This relands commit rL360833 which caused issues on Win32
bots due to path handling/normalization differences. Now
this uses `sys::path::filename` which should handle
additional edge cases on Win32.

Original commit:

"[Clang][PP] Add the __FILE_NAME__ builtin macro" 

This patch adds the __FILE_NAME__ macro that expands to the
last component of the path, similar to __FILE__ except with
a guarantee that only the last path component (without the
separator) will be rendered.

I intend to follow through with discussion of this with WG14
as a potential inclusion in the C standard or failing that,
try to discuss this with GCC developers since this extension
is desired by GCC and Clang users/developers alike.

Differential Revision: https://reviews.llvm.org/D61756

llvm-svn: 360938
parent 708afb56
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