[dpdk-dev] [PATCH 1/4] doc/api: hide verbose doxygen standard output

[Thomas Monjalon]

29/09/2020 18:23, Bruce Richardson:
> On Tue, Sep 29, 2020 at 05:55:44PM +0200, Thomas Monjalon wrote:
> > > The standard output of doxygen is very verbose, and since ninja mixes
> > > stdout and stderr together it makes it difficult to see any warnings from
> > > the doxygen run. Therefore, we can just log the standard output to file,
> > > and only output the stderr to make warnings clear.
> > [...]
> > > -doxygen "${DOXYCONF}" | tee doxygen.out
> > > +doxygen "${DOXYCONF}" > doxygen.out
> > 
> > ninja is printing extra lines:
> > 	ninja: Entering directory `build'
> > 	[0/1] Running external command doc
> > 	Building docs: Doxygen_API HTML_Guides
> > 
> > It makes hard to detect whether all run fine or not.
> > Can we remove these extra lines with a ninja option?
> > Can we return an error if there are some errors in doxygen?
> > 
> If doxygen fails, then the whole build should fail - though to be honest
> that is hard to test since most invalid changes I've tried making end up
> just as warnings. The wrapper script for doxygen has "-e" flag so it should
> fail if any part of it does, i.e. doxygen, and ninja always returns error
> if any subtask fails.
> 
> There is also the WARN_AS_ERROR setting for doxygen which we can use if you
> want to be stricter [1]. Once all warnings are fixed, I'd suggest setting
> that based on the werror setting for the build as a whole.
> 
> [1] https://www.doxygen.nl/manual/config.html#cfg_warn_as_error

Yes good idea.
Can we make WARN_AS_ERROR depending on the meson option -werror?