cc1plus: warning: switch ‘-mcpu=ares+crypto+ssbs+noprofile’ conflicts with ‘-march=armv8-a’ switch

[hughobrien]

Many instances of the below error during recent builds

cc1plus: warning: switch ‘-mcpu=ares+crypto+ssbs+noprofile’ conflicts with ‘-march=armv8-a’ switch                                  

Resulting binary still reports NEON support

system_info: n_threads = 16 / 16 | AVX = 0 | AVX2 = 0 | AVX512 = 0 | AVX512_VBMI = 0 | AVX512_VNNI = 0 | FMA = 0 | NEON = 1 | ARM_FMA = 1 | F16C = 0 | FP16_VA = 0 | WASM_SIMD = 0 | BLAS = 0 | SSE3 = 0 | VSX = 0 | 

And perf seeems about the same but I think perhaps we're not correctly inferring the correct CPU arch here. This is a hosted ARM server.

❯ lscpu
Architecture:            aarch64
  CPU op-mode(s):        32-bit, 64-bit
  Byte Order:            Little Endian
CPU(s):                  16
  On-line CPU(s) list:   0-15
Vendor ID:               ARM
  Model name:            Neoverse-N1
    Model:               1
    Thread(s) per core:  1
    Core(s) per cluster: 16
    Socket(s):           -
    Cluster(s):          1
    Stepping:            r3p1
    BogoMIPS:            50.00
    Flags:               fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp ssbs
NUMA:                    
  NUMA node(s):          1
  NUMA node0 CPU(s):     0-15
Vulnerabilities:         
  Itlb multihit:         Not affected
  L1tf:                  Not affected
  Mds:                   Not affected
  Meltdown:              Not affected
  Mmio stale data:       Not affected
  Retbleed:              Not affected
  Spec store bypass:     Mitigation; Speculative Store Bypass disabled via prctl
  Spectre v1:            Mitigation; __user pointer sanitization
  Spectre v2:            Mitigation; CSV2, BHB
  Srbds:                 Not affected
  Tsx async abort:       Not affected

❯ uname -a
Linux host 6.1.26 #1-NixOS SMP Wed Apr 26 12:28:44 UTC 2023 aarch64 GNU/Linux

❯ g++ --version
g++ (GCC) 12.2.0

❯ make --version
GNU Make 4.4.1
Built for aarch64-unknown-linux-gnu

[github-actions]

This issue was closed because it has been inactive for 14 days since being marked as stale.