On 08/01/2014 04:21, Argyrios Kyrtzidis wrote:
On Jan 7, 2014, at 7:56 PM, Alp Toker <[email protected]> wrote:
On 08/01/2014 01:48, Argyrios Kyrtzidis wrote:
On Jan 6, 2014, at 1:47 PM, Richard Smith <[email protected]
<mailto:[email protected]>> wrote:
One view on this is simply: -Wsystem-headers means "don't give system headers
special treatment when emitting diagnostics”.
This is it exactly. “Treat all headers like normal headers"
We don't have a flag to treat all headers as normal headers at the moment. It'd
be very simple to implement compared to -Wsystem-headers which somewhat
intricate.
Could you elaborate, AFAICT '-Wsystem-headers' is treated specially, it's
outside the diagnostic group machinery, and acts essentially as a flag.
If you'd like to have something like '-fwarn-on-system-headers' or something
instead, that's another discussion, but as far as the PR is concerned I don't
see why we need to change what -Wsystem-headers is currently doing.
PR18327 reports a valid corner-case bug in the way a very small number
(around 8 in total) diagnostics are upgraded from warnings/extensions to
errors, and then were forgetting to downgrade them back to warnings as
all the other diagnostics are seen. So it's just an implementation
detail that was leaking and manifesting as errors in a context where it
should have been impossible.
Remember that this flag doesn't control the very many isInSystemHeader()
and isInSystemMacro() checks that happen earlier than the diagnostic
machinery. A -fno-system-headers flag to just disable the whole system
header machinery would be separately useful though, agreed.
Alp.
Alp.
That would seem to make perfect sense to people developing system headers, and
is our current behavior. What is the use case that leads to enabling
-Wsystem-headers but not wanting that to lead to errors? PR18327 doesn't make
that obvious.
Not sure I’m following that report, if one doesn’t like that that diagnostic is
by default mapped to an error, maybe map it to a warning on the command-line or
discuss whether it should not be mapped to error by default ?
I don’t see a need to complicate what -Wsystem-headers does.
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