svn commit: r278934 - in head: cddl/contrib/opensolaris/lib/libdtrace/common share/mk

[Jan Beich]

Mark Johnston <markj at FreeBSD.org> writes:

> Author: markj
> Date: Wed Feb 18 03:54:54 2015
> New Revision: 278934
> URL: https://svnweb.freebsd.org/changeset/base/278934
>
> Log:
>   Remove drti.o's dependency on libelf. This makes it possible to add DTrace
>   probes to userland programs and libraries without also needing to link
>   libelf.
>   
>   dtrace -G places the __SUNW_dof symbol at the beginning of the DOF (DTrace
>   probe and provider metdata) section in the generated object file; drti.o
>   now just uses this symbol to locate the section. A complication occurs
>   when multiple dtrace-generated object files are linked together, since the
>   __SUNW_dof symbol defined in each file is global. This is handled by
>   using objcopy(1) to convert __SUNW_dof to a local symbol once drti.o has
>   been linked with the generated object file. Upstream, this is done using a
>   linker feature not present in GNU ld.
>   
>   Differential Revision:	https://reviews.freebsd.org/D1757
>   Reviewed by:	rpaulo
>   MFC after:	1 month
>   Relnotes:	yes

Any reason this wasn't MFC'd yet? It would serve as incentive to *not*
add FreeBSD-specific conditionals for building dtrace probes in various
upstream projects.
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