[PATCH 00/24] drm: add extern C guard for the UAPI headers

[Emil Velikov]

[Re-sending to the correct mailing list. Apologies if you've seen it already]

Hi all, David Howells

Dave Airlie pointed out that "polluting" the headers in a manner as seen 
with this series might not be too wise. David H, can we hear your view 
on the topic ?

Note that these headers are meant to be used by more than just Linux 
(various BSD and Solaris come to mind), making things more complicated.


The change:


As some of you may know there are some subtle distinctions between C and 
C++ structs/enums, thus one should wrap/annotate them roughly like below.


...
#if defined(__cplusplus)
extern "C" {
#endif

struct foo {
    int bar;
    ...
};

...

#if defined(__cplusplus)
}
#endif


In order to work around the lack of these users can wrap the header 
inclusion in the same way. For example:


...
#if defined(__cplusplus)
extern "C" {
#endif

#include <i915_drm.h>

#if defined(__cplusplus)
}
#endif


Yet we should avoid this approach, as it might cause issues [1] [2] [3]. 
Thus here is a series which systematically updates all the UAPI headers 
in one go.

I would prefer if we get this merged in one go. Daniel, is it possible 
to go through drm-misc ? The series is already based on it.

Maintainers, does this sound reasonable, can we get a few acks ?


Thanks
Emil

[1] http://developers.redhat.com/blog/2016/02/29/why-cstdlib-is-more-complicated-than-you-might-think/
[2] https://isocpp.org/wiki/faq/mixing-c-and-cpp
[3] http://www.oracle.com/technetwork/articles/servers-storage-dev/mixingcandcpluspluscode-305840.html

Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: Andrzej Hajda <a.hajda at samsung.com>
Cc: Ben Skeggs <bskeggs at redhat.com>
Cc: Brian Paul <brianp at vmware.com>
Cc: Christian Gmeiner <christian.gmeiner at gmail.com>
Cc: Christian König <christian.koenig at amd.com>
Cc: Daniel Vetter <daniel.vetter at intel.com>
Cc: Dave Airlie <airlied at redhat.com>
Cc: David Howells <dhowells at redhat.com>
Cc: Eric Anholt <eric at anholt.net>
Cc: Erik Faye-Lund <kusmabite at gmail.com>
Cc: Gerd Hoffmann <kraxel at redhat.com>
Cc: Inki Dae <inki.dae at samsung.com>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
Cc: Lucas Stach <l.stach at pengutronix.de>
Cc: Michel Dänzer <michel.daenzer at amd.com>
Cc: Rob Clark <robdclark at gmail.com>
Cc: Russell King <rmk+kernel at arm.linux.org.uk>
Cc: Sinclair Yeh <syeh at vmware.com>
Cc: Thierry Reding <thierry.reding at gmail.com>
Cc: Thomas Hellstrom <thellstrom at vmware.com>
Cc: Tomi Valkeinen <tomi.valkeinen at ti.com>


Emil Velikov (24):
  drm/amdgpu: add extern C guard for the UAPI header
  drm/armada: add extern C guard for the UAPI header
  drm: add extern C guard for the UAPI headers
  drm/etnaviv: add extern C guard for the UAPI header
  drm/exynos: add extern C guard for the UAPI header
  drm/i810: add extern C guard for the UAPI header
  drm/i915: add extern C guard for the UAPI header
  drm/mga: add extern C guard for the UAPI header
  drm/msm: add extern C guard for the UAPI header
  drm/nouveau: add extern C guard for the UAPI header
  drm/nouveau: drop drm/ prefix from include
  drm/omap: add extern C guard for the UAPI header
  drm/qxl: add extern C guard for the UAPI header
  drm/qxl: remove XXX comment from the UAPI header
  drm/r128: add extern C guard for the UAPI header
  drm/radeon: add extern C guard for the UAPI header
  drm/savage: add extern C guard for the UAPI header
  drm/sis: add extern C guard for the UAPI header
  drm/sis: add missing include drm.h for the UAPI header
  drm/tegra: add extern C guard for the UAPI header
  drm/vc4: add extern C guard for the UAPI header
  drm/via: add extern C guard for the UAPI header
  drm/virgl: add extern C guard for the UAPI header
  drm/vmwgfx: add extern C guard for the UAPI header

 include/uapi/drm/amdgpu_drm.h  |  8 ++++++++
 include/uapi/drm/armada_drm.h  |  8 ++++++++
 include/uapi/drm/drm.h         | 16 ++++++++++++++++
 include/uapi/drm/drm_fourcc.h  |  8 ++++++++
 include/uapi/drm/drm_mode.h    |  8 ++++++++
 include/uapi/drm/drm_sarea.h   |  8 ++++++++
 include/uapi/drm/etnaviv_drm.h |  8 ++++++++
 include/uapi/drm/exynos_drm.h  |  8 ++++++++
 include/uapi/drm/i810_drm.h    |  8 ++++++++
 include/uapi/drm/i915_drm.h    |  8 ++++++++
 include/uapi/drm/mga_drm.h     |  8 ++++++++
 include/uapi/drm/msm_drm.h     |  8 ++++++++
 include/uapi/drm/nouveau_drm.h | 10 +++++++++-
 include/uapi/drm/omap_drm.h    |  8 ++++++++
 include/uapi/drm/qxl_drm.h     |  9 ++++++++-
 include/uapi/drm/r128_drm.h    |  8 ++++++++
 include/uapi/drm/radeon_drm.h  |  8 ++++++++
 include/uapi/drm/savage_drm.h  |  8 ++++++++
 include/uapi/drm/sis_drm.h     | 10 ++++++++++
 include/uapi/drm/tegra_drm.h   |  8 ++++++++
 include/uapi/drm/vc4_drm.h     |  8 ++++++++
 include/uapi/drm/via_drm.h     |  8 ++++++++
 include/uapi/drm/virtgpu_drm.h |  8 ++++++++
 include/uapi/drm/vmwgfx_drm.h  |  9 +++++++++
 24 files changed, 204 insertions(+), 2 deletions(-)

-- 
2.6.2