[vbox-dev] my patches for VirtualBox-4.2.0 on Fedora 17+

Michael Thayer michael.thayer at oracle.com
Fri Sep 28 09:19:35 GMT 2012

Hello Sérgio,

On 09/27/2012 10:54 PM, Sérgio Basto wrote:
> as a little side note, we have in
> VirtualBox-4.2.0/src/VBox/Additions/x11/vboxvideo/Makefile.kmk  :
> vboxvideo_13_DEFS := $(vboxvideo_70_DEFS) VBOXVIDEO_13
> vboxvideo_15_DEFS := $(vboxvideo_13_DEFS) VBOX_DRI NO_ANSIC PCIACCESS
> vboxvideo_drv_70_DEFS = $(vboxvideo_70_DEFS)
> vboxvideo_drv_13_DEFS := $(vboxvideo_13_DEFS)
> what I mean when I want know what DEFS for vboxvideo_drv_113, I got to
> follow all attributions ... and can't comment any ...
The idea is to save code duplication in Make files like in C code, so 
that if something needs to be changed it can be changed in one place and 
I don't have to search for ages to find all the places it needs to be 
done in (and hope I did get them all).  In fact if you want to see all 
the defines you have to follow a lot more attributes (e.g. 
vboxvideo_drv_system uses the VBOXGUESTR3XORGMOD _TEMPLATE, so you need 
to look at Config.kmk to see that "TEMPLATE_VBOXGUESTR3XORGMOD_DEFS = 
RTMEM_NO_WRAP_TO_EF_APIS" and so on).  There are arguments to be made 
for both sides (maintainability versus readability), and I don't deny 
that our Make files can be painful to follow at times, but given that, I 
don't really think that in the case of "vboxvideo_*_DEFS" it makes sense 
to duplicate all the defines again when in practice we want them to be 
as similar as possible for the different versions, not each one with 
individual bits commented out.  Please tell me though what you would 
like to change with the defines, as perhaps it will make sense for us too!


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