<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/133709>133709</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang -fuse-ld=lld --target= prefers target-prefixed lld binaries over non-prefixed lld in its own directory
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            lld,
            clang:driver
      </td>
    </tr>

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

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

<pre>
    clang's `--target` flag affects which `lld` binary it chooses. That seems reasonable, but it can lead to surprising behaviour if there are multiple toolchains available.

Let's pretend we have some old crosscompiling toolchain in our PATH:

```
$ mkdir -p /tmp/somepath/bin
$ touch /tmp/somepath/bin/x86_64-linux-ld.lld
$ chmod +x /tmp/somepath/bin/x86_64-linux-ld.lld
$ export PATH=$PATH:/tmp/somepath/bin
```

clang will normally prefer the lld installed right next to itself:

```
$ touch a.o
$ build/bin/clang -### -fuse-ld=lld a.o
[...]
build/bin/ld.lld [...]
```

However, if we pass a `--target` flag, it prefers the lld version that has that target prefix *even if this is not in the clang directory*:

```
$ build/bin/clang -### --target=x86_64-linux -fuse-ld=lld a.o
[...]
/tmp/somepath/bin/x86_64-linux-ld.lld [...]
```

That seems potentially surprising!

It seems there are two criteria at play here:

1. clang will prefer an lld binary in its own directory over binaries on PATH
2. clang will prefer an lld binary with the target prefix over one without

It seems that 2) currently takes precedence. Maybe it should be the other way around?
</pre>
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