On Mon 09 Oct 2017, Tapani Pälli wrote:
>
>
> On 09/28/2017 03:11 AM, Chad Versace wrote:
> > This patch prevents compilation failures in upcoming Android Vulkan
> > patches, failures due to redefinition of LOG_TAG in Android system
> > headers.
> >
> > This patch does not change the value of LOG_TAG. It remains
> > "INTEL-MESA". (I don't like it, though. The all-caps smells like
> > FORTRAN).
> >
> > Only one Intel header defined LOG_TAG: gen_debug.h. I believe I defined
> > it correctly in all the necessary Automake and Android.mk files, but one
> > can never truly know when touching build systems.
> >
> > This patch is ugly and too big. If someone knows a better way, please
> > speak up.
>
> Currently we have INTEL-MESA, EGL-DRI2 and EGL_MAIN. IMO we could simplify
> and have just 'MESA' or 'mesa'? Debug messages from EGL could indicate 'EGL'
> in the message if that is not clear from the context already.
>
> After such change we could just have it defined once in Android.common.mk
> for Android build.
(Rob, opinions?)
I'm in favor of unifying all LOG_TAGs to a single tag. That would
simplify debugging.
Currently, sometimes I misremember the LOG_TAG, type the wrong one in
`logcat -s "$TAG1,$TAG2,$TAG3"`, and then waste time because I get
a false negative when searching through the logs. "Hmm... that ALOGD
message never appeared... we must never hit that path!". If there was
a single log, the likelihood of bad logcat searches greatly diminishes.
Let's choose a LOG_TAG that follows the conventions of other tags in the
system. I just scanned the logcat on a running system for examples, and
I found a single ALL-CAPS tag. I find these three classes of tags:
- CamelCase. I suspect these mirror the names of Java classes or
C++ classes.
Examples:
BackupManagerService
PlayCommon
NetworkStats
ArcAppTaskTracker
- snake_case and hyphen-case. This case seems to be used for low-level
system components.
Examples:
libc
art
wayland-service
- ALLCAPS. I found one case of this: 'DEBUG'.
Based on that evidence, 'mesa' is probably the best choice, with 'Mesa'
as second best.
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