Re: [dpdk-dev] [PATCH 1/1] devtools: fix build test config inheritance from env

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

On Tue, Nov 10, 2020 at 06:09:45PM +0000, Ferruh Yigit wrote:
> On 11/10/2020 5:55 PM, Thomas Monjalon wrote:
> > 10/11/2020 18:18, Ferruh Yigit:
> > > On 11/9/2020 9:00 PM, Thomas Monjalon wrote:
> > > > PKG_CONFIG_PATH is specific to each target, so it must be empty
> > > > before configuring each build from the file according to DPDK_TARGET.
> > > > Inheriting a default PKG_CONFIG_PATH for all targets does not make sense
> > > > and is prone to confusion.
> > [...]
> > > In same run both 64bit and 32bit builds are done,
> > 
> > Multiple targets can be built yes.
> > 
> > > At least for my environment,
> > > for 64bit, PKG_CONFIG_PATH should be '/usr/local/lib64/pkgconfig/'
> > > for 32bit, PKG_CONFIG_PATH should be '/usr/lib/pkgconfig/'
> > 
> > Not sure you need to set these values in PKG_CONFIG_PATH.
> > At least /usr/lib/pkgconfig/ is already set in PKG_CONFIG_LIBDIR.
> > 
> > Let me rephrase the man page of pkg-config:
> > PKG_CONFIG_LIBDIR is the primary paths list
> > PKG_CONFIG_PATH is the secondary paths list
> > 
> > > What should I set in the config file to support both?
> > 
> > The standard paths for your 64-bit machine should be built-in
> > in your pkg-config.
> > The standard path for 32-bit is already set automatically
> > in devtools/test-meson-builds.sh.
> > Only additional specific paths should be set in a config file.
> > 
> > What is a config file? It is loaded by devtools/load-devel-config:
> > 	- /etc/dpdk/devel.config (system-wide)
> > 	- or ~/.config/dpdk/devel.config (user config)
> > 	- or .develconfig (project directory config)
> > Personally I set all my configs in ~/.config/dpdk/devel.config.
> > Note that the same file is used to configure multiple tools.
> > 
> > For each build, some variables are reset the variable DPDK_TARGET is set,
> > and the config file is sourced.
> > The typical values of DPDK_TARGET are:
> > 	- i386-pc-linux-gnu
> > 	- x86_64-pc-linux-gnu
> > 	- x86_64-w64-mingw32
> > 	- aarch64-linux-gnu
> > 	- powerpc64le-linux-gcc
> > 
> > TLDR, I assume you just want to set an additional 64-bit path,
> > so the config file should look like:
> > 
> > if [ "$DPDK_TARGET" = x86_64-pc-linux-gnu ] ; then
> > 	export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib64/pkgconfig
> > fi
> > 
> > 
> 
> Thanks for the clarification.
> 
> Standard paths seems should be covered already in current script, which I
> was trying to do with "export PKG_CONFIG_PATH=$CUSTOM_PKG_CONFIG_PATH" line
> in my patch,
> 
> I may be mixed 'PKG_CONFIG_LIBDIR' vs 'PKG_CONFIG_PATH' usage, let me check
> it in my environment.
> 

For just adding a new custom path for pkg-config using PKG_CONFIG_PATH. For
building anything other than a native 64-bit build you need to override
PKG_CONFIG_LIBDIR and clear PKG_CONFIG_PATH, otherwise the 64-bit packages
will be found from the standard paths if not found in a 32-bit one.

/Bruce