Re: [dpdk-dev] [PATCH v2 4/6] devtools/test-meson-builds: add testing of pkg-config file

[Bruce Richardson <bruce.richardson@intel.com>]

On Thu, May 02, 2019 at 02:38:49PM +0200, Thomas Monjalon wrote:
> Hi,
> 
> I will probably have a ton of comments about adding a new compilation tests,
> and I think it is a bit late for such an addition.
> However, all the fixes should go in 19.05.
> 
> 26/04/2019 18:50, Bruce Richardson:
> > The pkg-config file generated as part of the build of DPDK should allow
> > applications to be built with an installed DPDK. We can test this as
> > part of the build by doing an install of DPDK to a temporary directory
> > within the build folder, and by then compiling up a few sample apps
> > using make working off that directory.
> > 
> > Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> > Acked-by: Luca Boccassi <bluca@debian.org>
> > ---
> > --- a/devtools/test-meson-builds.sh
> > +++ b/devtools/test-meson-builds.sh
> > +##############
> > +# Test installation of the x86-default target, to be used for checking
> > +# the sample apps build using the pkg-config file for cflags and libs
> > +###############
> 
> I would prefer simpler comment formatting.
> It makes this test very special.

Your comment implies that it is not :-)
Sure, I can reduce the highlighting.

> 
> > +build_path=build-x86-default
> > +DESTDIR=`pwd`/$build_path/install-root ; export DESTDIR
> 
> export DESTDIR=... is not supported everywhere?

No 100% sure, so left it like this just in case.

> I prefer new shell substitution syntax $() instead of backquotes.
> 
Sure, I agree it's more readable.

> > +$ninja_cmd -C $build_path install
> > +
> > +pc_file=$(find $DESTDIR -name libdpdk.pc)
> > +PKG_CONFIG_PATH=$(dirname $pc_file) ; export PKG_CONFIG_PATH
> > +
> > +# rather than hacking our environment, just edit the .pc file prefix value
> > +sed -i -e "s|prefix=|prefix=$DESTDIR|" $pc_file
> 
> What is the alternative?
> Cannot we configure meson with the right prefix?
> 

See previous discussion.
Short answer, yes we can, but the prefix does not apply to kernel modules
as they always install in /lib/modules folder.

> > +for example in helloworld l2fwd l3fwd skeleton timer; do
> > +	echo "## Building $example"
> > +	$MAKE -C $DESTDIR/usr/local/share/dpdk/examples/$example
> > +done
> > +
> > +echo ""
> > +echo "## $0: Completed OK"
> 
> This last log is uncommon.
> 
Yes, it is. However, due to parallelism, sometimes there is an error
message printed out that scrolls off-screen as the other build processes
come to a halt. I felt it worthwhile to add this at the end to ensure it
was clear whether things succeeded or not. If you prefer, I can change it
to a print on failure?

/Bruce