Re: [dpdk-dev] [PATCH 3/4] devtools/test-meson-builds: add testing of pkg-config file

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

On Wed, Apr 24, 2019 at 12:02:24PM +0100, Luca Boccassi wrote:
> On Wed, 2019-04-24 at 11:41 +0100, Bruce Richardson wrote:
> > On Wed, Apr 24, 2019 at 10:22:04AM +0100, Luca Boccassi wrote:
> > > On Tue, 2019-04-23 at 23:06 +0100, Bruce Richardson wrote:
> > > > 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
> > > > 
> > > > 
> > > > --- devtools/test-meson-builds.sh | 17 +++++++++++++++++ 1 file
> > > > changed, 17 insertions(+)
> > > > 
> > > > diff --git a/devtools/test-meson-builds.sh b/devtools/test-meson-
> > > > builds.sh index 630a1a6fe..dfba2a782 100755 ---
> > > > a/devtools/test-meson-builds.sh +++ b/devtools/test-meson-
> > > > builds.sh @@
> > > > -90,3 +90,20 @@ if command -v $c >/dev/null 2>&1 ; then
> > > > $use_shared
> > > > --cross-file $f done fi + +############## +# Test installation of
> > > > the
> > > > x86-default target, to be used for checking +# the sample apps
> > > > build
> > > > using the pkg-config file for cflags and libs +###############
> > > > +build_path=build-x86-default +DESTDIR=`pwd`/$build_path/install-
> > > > root ;
> > > > export DESTDIR
> > > > +PKG_CONFIG_PATH=$DESTDIR/usr/local/lib64/pkgconfig ;
> > > > export PKG_CONFIG_PATH +$ninja_cmd -C $build_path install + +#
> > > > rather
> > > > than hacking our environment, just edit the .pc file prefix value
> > > > +sed
> > > > -i "s|prefix=|prefix=$DESTDIR|" $PKG_CONFIG_PATH/libdpdk.pc
> > > 
> > > What about just using meson's prefix option instead? Which is how
> > > it
> > > would be used in a real use case
> > > 
> > 
> > I don't think that would fully work, as my understanding is that the
> > prefix
> > option would apply only to the /usr/local parts, but not to the
> > kernel
> > modules which would still try and install in /lib/.
> > 
> > /Bruce
> 
> What about doing a meson configure -Denable_kmods=false before the
> ninja install? The modules are not needed for that test anyway, right?
> Alternatively, the kernel src dir could be symlinked in the build path,
> and the kernel_dir option could be used
> 
> I'm just worried that the test should be as "realistic" as possible, to
> avoid missing something
> 
Yes, I did think of that too, but it does mean doing another configuration
run in meson, and possibly a rebuild too if the rte_build_config.h file
changes. Therefore I decided to use DESTDIR for the sake of speed here. I
assumed there would be a pkg-config variable to adjust the output paths
based on a sysroot, but couldn't find a suitable one.

In any case, I'll see about changing things as you suggest in V2 -
correctness is more important that speed here.

/Bruce