commit 11543b27fe16d81ca5483ecb98ec7a5b2426e0c0
author Richard Purdie <richard.purdie@linuxfoundation.org> Fri Nov 18 13:13:50 2022 -0700
committer Jeff Law <jlaw@ventanamicro.com> Fri Nov 18 13:13:50 2022 -0700
tree 23cf7c6e67f1321b7000b1e75783b330f81baea5
parent 59cc4da605e5cb8e31e9f1d54ef2b5ba47fc8f88

libcpp: Avoid remapping filenames within directives

Code such as:

 #include __FILE__

can interact poorly with the *-prefix-map options when cross compiling. In
general you're after to remap filenames for use in target context but the
local paths should be used to find include files at compile time. Ingoring
filename remapping for directives allows avoiding such failures.

Fix this to improve such usage and then document this against file-prefix-map
(referenced by the other *-prefix-map options) to make the behaviour clear
and defined.

libcpp/ChangeLog:

	* macro.cc (_cpp_builtin_macro_text): Don't remap filenames within
	directives.

gcc/ChangeLog:

	* doc/invoke.texi: Document prefix-maps don't affect directives.