Re: [dpdk-dev] [PATCH v2] devtools: fix 32-bits build

[Thomas Monjalon <thomas@monjalon.net>]

09/11/2020 15:55, Ferruh Yigit:
> If the 'PKG_CONFIG_PATH' is set in the environment before script run,
> 32 bit still uses that value for 64-bits libraries.
> 
> From the build log:
> 
> "
> Using DPDK_TARGET i386-pc-linux-gnu
> meson  -Dexamples=l3fwd --buildtype=debugoptimized --werror
> -Dc_args=-m32 -Dc_link_args=-m32
> /tmp/dpdk_maintain/self/dpdk/devtools/.. ./build-32b
> ...
> Using 'PKG_CONFIG_PATH' from environment with value:
> '/usr/local/lib64/pkgconfig/
> "
> 
> This causes build error when linking with the found libraries.
> 
> Reproduced with 'librte_bpf' which only has 64 bit installed but still
> enables building 'af_xdp' and link fails.
> 
> To fix this, using default 'PKG_CONFIG_PATH' variable unless
> 'CUSTOM_PKG_CONFIG_PATH' set, and set the 'CUSTOM_PKG_CONFIG_PATH' for
> 32 bit build.
> 
> Fixes: 9b83106d8784 ("devtools: test 32-bit build")
> 
> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
> ---
> Cc: Bruce Richardson <bruce.richardson@intel.com>
> Cc: Thomas Monjalon <thomas@monjalon.net>
> 
> v2:
> * Enable overwriting default 'PKG_CONFIG_PATH' value

It was not my conclusion.
I think we can just reset all env vars.