[Bug 220125] head -r320059 (e.g.) arm64: buildkernel after kernel-toolchain: crypto/armv8/armv8_crypto_wrap.c compile fails with .../lib/clang/4.0.0/include/arm_neon.h: fatal error: 'stdint.h' file not found

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220125

--- Comment #6 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Heinz N. Gies from comment #5)

If the build-host system type is the same as
the build-target system type and stdint.h
has not actually changed then

/usr/lib/include/stdint.h

content may well actually be correct content.

But if stdint.h has changed (unlikely?) or
or the build is a cross build then the

/usr/lib/include/stdint.h

content would more likely be wrong in some
way. But that way need not make the build
abort: it may just build something that is
wrong in some way.

In my examples such as:

. . ./arm64.aarch64/usr/src/tmp/usr/include/stdint.h

the arm64.aarch64 is the build-target type.
(FreeBSD normally only produces such x.y
naming in the paths for cross builds.)

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