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Date: Sun, 21 May 2017 21:00:42 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Dimitry Andric <dim@FreeBSD.org>
Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: Re: svn commit: r318594 - in head: lib lib/libc++experimental
 tools/build/mk
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On Sun, May 21, 2017 at 05:07:12PM +0000, Dimitry Andric wrote:
> Author: dim
> Date: Sun May 21 17:07:12 2017
> New Revision: 318594
> URL: https://svnweb.freebsd.org/changeset/base/318594
> 
> Log:
>   Add libc++experimental.a for std::experimental support
>   
>   This adds a separate library for supporting std::experimental features.
>   It is purposefully static, and must be explicitly linked into programs
>   using -lc++experimental.
>   
>   PLEASE NOTE: there is NO WARRANTY as to any stability or continuing
>   existence of the features in the std::experimental parts of the C++
>   library!
>   
>   Reviewed by:	ed
>   Differential Revision: https://reviews.freebsd.org/D10840
> 
> Added:
>   head/lib/libc++experimental/
>   head/lib/libc++experimental/Makefile   (contents, props changed)
> Modified:
>   head/lib/Makefile
>   head/tools/build/mk/OptionalObsoleteFiles.inc
> 
> Modified: head/lib/Makefile
> ==============================================================================
> --- head/lib/Makefile	Sun May 21 15:37:08 2017	(r318593)
> +++ head/lib/Makefile	Sun May 21 17:07:12 2017	(r318594)
> @@ -156,7 +156,7 @@ _libclang_rt=	libclang_rt
>  
>  .if ${MK_LIBCPLUSPLUS} != "no"
>  _libcxxrt=	libcxxrt
> -_libcplusplus=	libc++
> +_libcplusplus=	libc++ libc++experimental
>  .endif
>  
>  SUBDIR.${MK_EFI}+=	libefivar
> 
> Added: head/lib/libc++experimental/Makefile
> ==============================================================================
> --- /dev/null	00:00:00 1970	(empty, because file is newly added)
> +++ head/lib/libc++experimental/Makefile	Sun May 21 17:07:12 2017	(r318594)
> @@ -0,0 +1,29 @@
> +# $FreeBSD$
> +
> +.include <src.opts.mk>
> +
> +PACKAGE=	clibs
> +SRCDIR=		${SRCTOP}/contrib/libc++
> +
> +LIB=		c++experimental
> +NO_PIC=
I suspect for this case it is almost required to provide
libc++experimental_pic.a, otherwise linking the lib to dso would
cause textrel.