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From: Jan Beich <jbeich@tormail.net>
To: "O. Hartmann" <ohartman@zedat.fu-berlin.de>
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Cc: freebsd-current@freebsd.org, freebsd-questions@freebsd.org
Subject: Re: FreeBSD 10.0-CURRENT/AMD64 (CLANG): lang/gcc46 fails to build
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"O. Hartmann" <ohartman@zedat.fu-berlin.de> writes:

> .././../gcc-4.6-20111202/libcpp/charset.c:1371:1: error: conflicting
> types for 'cpp_interpret_string'
> cpp_interpret_string (cpp_reader *pfile, const cpp_string *from, size_t
> count,
> ^
> .././../gcc-4.6-20111202/libcpp/include/cpplib.h:742:13: note: previous
> declaration is here
> extern bool cpp_interpret_string (cpp_reader *,
>             ^

Have you built world WITH_ICONV= ? Try the 2nd patch in ports/161417.
ports/163103 confirms the issue is not related to clang, nor 10-CURRENT.