svn commit: r270803 - head/libexec/rtld-elf

[Bryan Drewery]

On 8/29/2014 5:44 AM, Konstantin Belousov wrote:
> Author: kib
> Date: Fri Aug 29 10:44:58 2014
> New Revision: 270803
> URL: http://svnweb.freebsd.org/changeset/base/270803
> 
> Log:
>   Document the whole settings needed to build a debug version of rtld.
>   
>   Sponsored by:	The FreeBSD Foundation
>   MFC after:	3 days
> 
> Modified:
>   head/libexec/rtld-elf/Makefile
> 
> Modified: head/libexec/rtld-elf/Makefile
> ==============================================================================
> --- head/libexec/rtld-elf/Makefile	Fri Aug 29 10:43:56 2014	(r270802)
> +++ head/libexec/rtld-elf/Makefile	Fri Aug 29 10:44:58 2014	(r270803)
> @@ -1,5 +1,9 @@
>  # $FreeBSD$
>  
> +# Use the following command to build local debug version of dynamic
> +# linker:
> +# make DEBUG_FLAGS=-g DEBUG=-DDEBUG MK_TESTS=no all
> +
>  .include <src.opts.mk>
>  MK_SSP=		no
>  
> 

How difficult would it be to allow DEBUG to be set during runtime like
GNU's can with LD_DEBUG? I have found GNU's LD_DEBUG to be very useful
for userland debugging, especially when using dlopen(3).

We have LD_DEBUG environment variable but it only prints if built with
-DDEBUG.

Is there a concern about performance by enabling this based only on
environment?

-- 
Regards,
Bryan Drewery

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