Re: build dpdk error by gcc 8.4.0

[Bruce Richardson <bruce.richardson@intel.com>]

On Tue, Mar 21, 2023 at 03:13:14PM +0800, hfli@netitest.com wrote:
> Hi Dev,
> 
> When I build dpdk on CentOS7.9 and GCC 8.4.0, it throw “operand type
> mismatch for `vpclmulqdq'”, how can I fix this?
> 
> FAILED: lib/net/libnet_crc_avx512_lib.a.p/net_crc_avx512.c.o 
> ccache cc -Ilib/net/libnet_crc_avx512_lib.a.p -Ilib/net -I../lib/net -I.
> -I.. -Iconfig -I../config -Ilib/eal/include -I../lib/eal/include
> -Ilib/eal/linux/include -I../lib/eal/linux/include -Ilib/eal/x86/include
> -I../lib/eal/x86/include -Ilib/eal/common -I../lib/eal/common -Ilib/eal -I..
> /lib/eal -Ilib/kvargs -I../lib/kvargs -Ilib/metrics -I../lib/metrics
> -Ilib/telemetry -I../lib/telemetry -fdiagnostics-color=always -pipe
> -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wextra -O3 -include rte_config.h
> -Wcast-qual -Wdeprecated -Wformat -Wformat-nonliteral -Wformat-security
> -Wmissing-declarations -Wmissing-prototypes -Wnested-externs
> -Wold-style-definition -Wpointer-arith -Wsign-compare -Wstrict-prototypes
> -Wundef -Wwrite-strings -Wno-packed-not-aligned
> -Wno-missing-field-initializers -D_GNU_SOURCE -fPIC -march=native
> -DALLOW_EXPERIMENTAL_API -DALLOW_INTERNAL_API -Wno-format-truncation
> -DCC_X86_64_SSE42_PCLMULQDQ_SUPPORT -DCC_X86_64_AVX512_VPCLMULQDQ_SUPPORT
> -mavx512f -mavx512bw -mavx512dq -mavx512vl -mvpclmulqdq -mavx2 -mavx -MD -MQ
> lib/net/libnet_crc_avx512_lib.a.p/net_crc_avx512.c.o -MF
> lib/net/libnet_crc_avx512_lib.a.p/net_crc_avx512.c.o.d -o
> lib/net/libnet_crc_avx512_lib.a.p/net_crc_avx512.c.o -c
> ../lib/net/net_crc_avx512.c
> {standard input}: Assembler messages:
> {standard input}:66: 错误：operand type mismatch for `vpclmulqdq'
> 

The assembler generally comes from the binutils package rather than with
gcc, so it could be a mismatch between new compiler and older assembler.
You could try getting a newer copy of binutils and see if that fixes it.

Alternatively, you can just try building with a target instruction set
which does not include vpcmulqdq (unless you need the code that uses that
instruction). Try configuring a build with
"-Dcpu_instruction_set=skylake-avx512", and see if that works. According to
the man page for gcc, that should give you AVX512 support, but not the
problematic instruction.

/Bruce