[cfe-commits] [PATCH] Warn if -isysroot is given an invalid path

Matthieu Monrocq matthieu.monrocq at gmail.com
Fri Dec 14 11:20:34 PST 2012

On Fri, Dec 14, 2012 at 7:41 PM, Eric Christopher <echristo at gmail.com>wrote:

> Sure, but I just don't see that providing much value.  The point of adding
>> a warning was to help catch things like typos in the sysroot path.  What
>> are the chances that someone is going to mis-type the sysroot and also
>> specify -Wmissing-sysroot?  I'm assuming that typos are most likely to come
>> up when someone is running the compiler by hand, rather than from a
>> makefile.  I suppose that it could still help when a makefile specifies an
>> SDK that is not currently installed.  I'm just not convinced that's worth
>> the effort of adding and maintaining a new warning, but I'm open to being
>> convinced.
> My only concerns are false positives in fairly standard use cases. I think
> the warning could be useful when debugging problems and if you know you
> aren't in the use cases that might give a false positive you can turn it on
> by default (perhaps with a new umbrella?) but false positives are bad for
> everyone :)
> -eric
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Actually maybe the best way is in putting this warning in -Wmissing-sysroot
AND make -Wmissing-sysroot part of -Wunused-command-line-argument.

=> if you turn on -Wunused-command-line-argument you get warned if the flag
is ignored because of an invalid path.

=> if you are warned and you do not care, you can always use
-Wunused-command-line-argument -Wno-missing-sysroot

In this scenario, -Wmissing-sysroot is not of much use by itself, but its
negative form is.

-- Matthieu
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