From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [PATCH] mk: allow renaming of build directories
Date: Mon, 23 Apr 2018 01:16:58 +0200
Message-ID: <13986424.9OyRsrj3FE@xps>
References: <20180228171156.91077-1-bruce.richardson@intel.com>
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Cc: dev@dpdk.org
To: Bruce Richardson <bruce.richardson@intel.com>
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28/02/2018 18:11, Bruce Richardson:
> When building using make, the Makefile in the build directory contained
> the name of the build directory to be passed as an "O=" parameter to
> the DPDK SDK makefiles. Unfortunately, this meant that the compilation
> would always fail if the build directory was renamed. To remove this
> limitation, we can use $(CURDIR) instead of the directory name.
> 
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> ---
> --- a/buildtools/gen-build-mk.sh
> +++ b/buildtools/gen-build-mk.sh
> -echo "	@\$(MAKE) -C $1 O=$2"
> +echo "	@\$(MAKE) -C $1 O=\$(CURDIR)"
>  echo
>  echo "%::"
> -echo "	@\$(MAKE) -C $1 O=$2 \$@"
> +echo "	@\$(MAKE) -C $1 O=\$(CURDIR) \$@"
> --- a/mk/rte.sdkconfig.mk
> +++ b/mk/rte.sdkconfig.mk
> -	$(Q)$(RTE_SDK)/buildtools/gen-build-mk.sh $(SDK_RELPATH) $(OUTPUT_RELPATH) \
> -		> $(RTE_OUTPUT)/Makefile
> +	$(Q)$(RTE_SDK)/buildtools/gen-build-mk.sh $(SDK_RELPATH) > $@

You need to remove the comment about the 2nd argument of the script:
#   $2: path of build dir (can be relative to $1)