On Fri, Nov 27, 2020 at 9:10 AM Ruifeng Wang <ruifeng.w...@arm.com> wrote: > > Gcc build with '-O0' on platforms with RTE_ARM_FEATURE_ATOMICS set > failed for: > ../lib/librte_efd/rte_efd.c > Assembler messages: > 3866: Error: selected processor does not support `crc32cb w0,w0,w1' > 3890: Error: selected processor does not support `crc32ch w0,w0,w1' > 3914: Error: selected processor does not support `crc32cw w0,w0,w1' > 3938: Error: selected processor does not support `crc32cx w0,w0,x1' > > This was caused by an architecture specifier added for Clang. > Unlike Clang, Gcc considers each inline assembly block to be dependent > and therefor, the architecture specifier impacts assemble of some > blocks require certain extension support.
I reproduced this error with -O0 for config/arm/arm64_octeontx2_linux_gcc. The patch looks simple enough and it only affects ARM builds. Jerin, Are you okay with this change for 20.11? Or should we wait 21.02? Ruifeng, Looking at the kernel, I see no distinction with gcc/clang, so I'd say the kernel has the same issue, or is there something else that differs in dpdk? Besides, the kernel patch previously mentioned had a followup fix. -- David Marchand
