From owner-freebsd-ports@freebsd.org  Wed Jul 10 14:19:30 2019
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From: Jan Beich <jbeich@FreeBSD.org>
To: Yuri <yuri@rawbw.com>
Cc: "ports\@freebsd.org" <ports@freebsd.org>
Subject: Re: 12.0-RELEASE-p7 doesn't contain std::filesystem that has been
 added to 12.0-STABLE some time later
References: <1eac89d9-babe-7069-8c4b-2fbe53234fcd@rawbw.com>
Date: Wed, 10 Jul 2019 16:19:23 +0200
In-Reply-To: <1eac89d9-babe-7069-8c4b-2fbe53234fcd@rawbw.com>
 (yuri@rawbw.com's message of "Mon, 8 Jul 2019 15:48:25 -0700")
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Yuri <yuri@rawbw.com> writes:

> Maybe the patch level should be updated, because any port using
> std::filesystem fails in the current poudriere 12.0-RELEASE-p7 VM.

Which port? What error? std::filesystem can be used on any FreeBSD version.

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