Hi VPP Devs, I'm trying to understand how to implement support for cross compilation for aarch64. I've put together some changes that are finally cross compiling DPDK (https://gerrit.fd.io/r/#/c/vpp/+/21035/), but the compilation is failing when it doesn't find openssl headers: In file included from /home/jlinkes/vpp/build-root/build-aarch64-aarch64/external/dpdk-19.05/drivers/crypto/qat/qat_sym.c:5:0: /usr/include/openssl/evp.h:13:11: fatal error: openssl/opensslconf.h: No such file or directory # include <openssl/opensslconf.h> ^~~~~~~~~~~~~~~~~~~~~~~ compilation terminated.
I've added locally cross compiled numalib to cflags and ldflags just to see how far I'd go with compilation. It seems that I'll need to do the same for not only openssl, but also the other dpdk dependencies (if I understand it correctly, I'll need at least ipseb-mb nasm) and possibly VPP dependencies. I've seen some e-mails suggesting that I should produce my own platforms/<platform>.mk file, but not much about any other steps. I also see the CROSS_TOOLS var in build-root/Makefile (and the corresponding $(PLATFORM)_cross_tools), but I wasn't able to figure out how to use those - is that something I should look into? What are the actual dependencies that *need* to be cross compiled before attempting to cross compile vpp/dpdk? I'd like to understand a bit more about this before I attempt to possibly fit a circle into a square-shaped hole. The goal here is to build VPP and DPDK (I didn't see an option in the root Makefile that would build just VPP without DPDK, but we want to support both) for generic armv8 linux target. I'd appreciate it if someone looked at my WIP patch and told me what I'm doing wrong and what's missing. Thanks, Juraj
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