[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
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Date: Sat, 18 Jun 2022 13:39:56 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264730 Dimitry Andric <dim@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |dim@FreeBSD.org --- Comment #1 from Dimitry Andric <dim@FreeBSD.org> --- I'm unsure why -fmodules changes this behavior, but __stdoutp is declared in /usr/include/stdio.h, like: #ifndef _STDSTREAM_DECLARED __BEGIN_DECLS extern FILE *__stdinp; extern FILE *__stdoutp; extern FILE *__stderrp; __END_DECLS #define _STDSTREAM_DECLARED #endif while there is a similar, but slightly different declaration in /usr/include/wchar.h: #ifndef _STDSTREAM_DECLARED extern FILE *__stdinp; extern FILE *__stdoutp; extern FILE *__stderrp; #define _STDSTREAM_DECLARED #endif Though in this file, __BEGIN_DECLS is at the top, and __END_DECLS at the bottom. libc++'s <cstdio.h> begins by including <__config>, and then <stdio.h>. I suspect the former is pulling in <wchar.h>, or something like that? On the other hand, you might be the very first person to ever try modules on FreeBSD. There are likely some bumps in the road. :) -- You are receiving this mail because: You are the assignee for the bug.