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Date:      Sat, 25 Jun 2022 07:45:25 +0000
From:      bugzilla-noreply@freebsd.org
To:        toolchain@FreeBSD.org
Subject:   [Bug 264730] clang++ -fmodules fails when using stdout from cstdio: error: declaration of '__stdoutp' must be imported from module 'std.iosfwd' before it is required
Message-ID:  <bug-264730-29464-loseG3gQVR@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-264730-29464@https.bugs.freebsd.org/bugzilla/>
References:  <bug-264730-29464@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D264730

--- Comment #7 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #6)

If a #include lists a importable header, it is implementation
defined for if the #include is replaced by an import directive
for the header in question or not.

But <cstdio> does not have to be importable: it is not listed
in Table 21 of, for example, INCITS/ISO/IEC 14882:2020 (2021).

So it appears that definitions outside 14882:2020 need to be
used to establish the expected (but not necessarily portable)
behavior for the example.

--=20
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