<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/76570>76570</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
             bulding bug in clang cc1: error: unknown value 'cortex-a77.cortex-a55' for '-mcpu' 
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          AlirezaParsi
      </td>
    </tr>
</table>

<pre>
    when i try to build my kernel with clang arm64 (native build)(version=16 , 17 and 18 i got this error :
`
cc1: error: unknown value 'cortex-a77.cortex-a55' for '-mcpu'
cc1: note: valid arguments are: cortex-a34 cortex-a35 cortex-a53 cortex-a57 cortex-a72 cortex-a73 thunderx thunderxt88p1 thunderxt88 octeontx octeontx81 octeontx83 thunderxt81 thunderxt83 ampere1 ampere1a emag xgene1 falkor qdf24xx exynos-m1 phecda thunderx2t99p1 vulcan thunderx2t99 cortex-a55 cortex-a75 cortex-a76 cortex-a76ae cortex-a77 cortex-a78 cortex-a78ae cortex-a78c cortex-a65 cortex-a65ae cortex-x1 cortex-x1c ares neoverse-n1 neoverse-e1 octeontx2 octeontx2t98 octeontx2t96 octeontx2t93 octeontx2f95 octeontx2f95n octeontx2f95mm a64fx tsv110 thunderx3t110 zeus neoverse-v1 neoverse-512tvb saphira cortex-a57.cortex-a53 cortex-a72.cortex-a53 cortex-a73.cortex-a35 cortex-a73.cortex-a53 cortex-a75.cortex-a55 cortex-a76.cortex-a55 cortex-r82 cortex-a510 cortex-a710 cortex-a715 cortex-x2 cortex-x3 neoverse-n2 demeter neoverse-v2 generic; did you mean 'cortex-a75.cortex-a55'?`


i dont have this problem with x86 clangs also my build script is like this :
`
   1   │ #/bin/bash
   2   │ export ARCH=arm64
   3   │ export SUBARCH=ARM64
   4   │ export KBUILD_BUILD_HOST=Ubuntu
   5   │ export KBUILD_BUILD_USER="Aliza"
   6   │ #export CFLAGS=-march=native
   7   │ make O=./out mrproper vendor/alioth_defconfig cc=clang
   8   │ make O=./out -j$(nproc --all) cc=clang`

im sure this is clang bug not my kernel and my method because i build 4 different kernels with this clang and this method.






more detail : 

Ubuntu clang version 16.0.6 (15)
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

Ubuntu clang version 17.0.6 (++20231208085918+6009708b4367-1~exp1~20231208090013.44)
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

Ubuntu clang version 18.0.0 (++20231228083416+9e439a353918-1~exp1~20231228203527.218)
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin


</pre>
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