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The kernel Makfile uses pkgconfig to check for libelf when enabling CONFIG_STACK_VALIDATION. We already have libelf in our DEPENDS, but the kernel Makefiles hardcode 'pkgconfig', so fail to pick up our pkgconfig-native binary that would report the correct flags and paths for libelf support. Rather than patching the kernel Makefile's to use pkgconfig-native, we can use the KERNEL_EXTRA_ARGS variable to pass the definition of HOST_LIBELF_LIBS via the kernel build commmand line. We conditionally set HOST_LIBELF_LIBS based on "stack" being in a newly introduced variable KERNEL_DEBUG_OPTIONS. The value of HOST_LIBELF_LIBS is the same as pkgconfig-native would set in a kernel build (but we cannot call pkgconfig at the point this variable is set). (From OE-Core rev: 0ad2b69dace6ac851c1f0bdae6a3c41045fc2d1d) Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>