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Subject: Re: 12.0-RELEASE-p7 doesn't contain std::filesystem that has been
 added to 12.0-STABLE some time later
To: Jan Beich <jbeich@freebsd.org>
Cc: "ports@freebsd.org" <ports@freebsd.org>
References: <1eac89d9-babe-7069-8c4b-2fbe53234fcd@rawbw.com>
 <sgre-m0pg-wny@FreeBSD.org>
From: Yuri <yuri@rawbw.com>
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Date: Wed, 10 Jul 2019 11:23:15 -0700
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On 2019-07-10 07:19, Jan Beich wrote:
> C++ example:
>
>    #if __cplusplus >= 201703L && __has_include(<filesystem>)
>    #include <filesystem>
>    #else
>    #include <experimental/filesystem>
>    namespace std {
>      namespace filesystem = experimental::filesystem;
>    }
>    #endif
>
> Makefile example:
>
>    .if exists(/usr/lib/libc++fs.a)
>    LIBS+=	-lc++fs
>    .elif exists(/usr/lib/libc++experimental.a)
>    # XXX Remove after FreeBSD 12.0 EOL
>    LIBS+=	-lc++experimental
>    .else
>    # XXX Remove after FreeBSD 11.2 EOL
>    USE_GCC=	yes
>    LIBS+=	-lstdc++fs
>    .endif


This helps with locating the header/library, but it fails to compile in 
poudriere on 12.0-RELEASE-p7:

x.cpp:213:15: error: no member named 'is_symlink' in 
'std::experimental::filesystem::v1::directory_entry'
     if (entry.is_symlink())
         ~~~~~ ^

It looks like 12.0-RELEASE-p7 is technically broken, because it doesn't 
include is_symlink().


Yuri