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Subject: [Bug 213428] make buildworld relies on /usr/include i.e. -nostdinc
 breaks buildworld
Date: Thu, 13 Oct 2016 03:00:38 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D213428

--- Comment #4 from Mark Millard <markmi@dsl-only.net> ---
(In reply to frf from comment #3)

As I understand buildworld does initially build some programs to execute on=
 the
host under the original operating system version that is running on the host
--to be executed during the build itself. The bootstrap clang itself is/can=
-be
an example (even if it is built to target a different TARGET_ARCH [cross
build]).

Thus I would not expect the

# rm /usr/include/*

example to work correctly in general. Avoiding /usr/include is specific to
certain (most) stages of buildworld, but not to all of it as I understand.

While most of what buildworld does targets the new operating system version=
 (if
it changed) and the TARGET_ARCH, such is not the case for everything it doe=
s.


Notes:

Your examples do not change the TARGET_ARCH. In some respects I'm referenci=
ng
structure that is there to allow other alternatives than you are using. The
operating system version's of files can still apply to your case.

Thanks for adding comment #3: I was very confused about the first part of
comment #2 before the extra information.

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