<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/140683>140683</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang] When cross compiling to bare matel on macos, clang always use xcode clang as link driver.
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          neko-para
      </td>
    </tr>
</table>

<pre>
    When targetting i686-elf (or i686-none-elf, more specifically), clang still using `/usr/bin/gcc` as the linking driver, which incorrectly introduce macos-only options.

```shell
$ clang -v
clang version 20.1.5 (https://github.com/llvm/llvm-project 7b09d7b446383b71b63d429b21ee45ba389c5134)
Target: i686-unknown-unknown-elf
Thread model: posix
InstalledDir: /opt/llvm-20/bin
```

* if use system linker

```shell
$ clang -target i686-none-none-elf build/src/libtest_lib.a -o kernel -ffreestanding -nostdlib -v                                       
clang version 20.1.5 (https://github.com/llvm/llvm-project 7b09d7b446383b71b63d429b21ee45ba389c5134)
Target: i686-none-none-elf
Thread model: posix
InstalledDir: /opt/llvm-20/bin
 "/usr/bin/gcc" -nostdlib -m32 -o kernel build/src/libtest_lib.a
ld: warning: The i386 architecture is deprecated for macOS (remove from the Xcode build setting: ARCHS)
ld: warning: ignoring file build/src/libtest_lib.a, building for macOS-i386 but attempting to link with file built for unknown-unsupported file format ( 0x21 0x3C 0x61 0x72 0x63 0x68 0x3E 0x0A 0x2F 0x20 0x20 0x20 0x20 0x20 0x20 0x20 )
Undefined symbols for architecture i386:
  "_main", referenced from:
 implicit entry/start for main executable
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
clang: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation)
```

* if use lld beside

```
$ clang -target i686-none-none-elf build/src/libtest_lib.a -o kernel -ffreestanding -nostdlib -fuse-ld=/opt/llvm-20/bin/ld.lld -v      
clang version 20.1.5 (https://github.com/llvm/llvm-project 7b09d7b446383b71b63d429b21ee45ba389c5134)
Target: i686-none-none-elf
Thread model: posix
InstalledDir: /opt/llvm-20/bin
 "/usr/bin/gcc" -nostdlib -fuse-ld=/opt/llvm-20/bin/ld.lld -m32 -o kernel build/src/libtest_lib.a
ld.lld: error: unknown argument '-dynamic', did you mean '-Bdynamic'
ld.lld: error: unknown argument '-arch'
ld.lld: error: unknown argument '-platform_version'
ld.lld: error: unknown argument '-syslibroot'
ld.lld: error: unable to find library -lto_library
ld.lld: error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/libLTO.dylib: unknown file type
ld.lld: error: cannot open i386: No such file or directory
ld.lld: error: cannot open macos: No such file or directory
ld.lld: error: cannot open 14.0.0: No such file or directory
ld.lld: error: cannot open 14.5: No such file or directory
ld.lld: error: cannot open /Library/Developer/CommandLineTools/SDKs/MacOSX14.5.sdk: Is a directory
clang: error: linker command failed with exit code 1 (use -v to see invocation)
clang: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation)
```

* Use ld.lld directly, which works currently

```shell
$ ld.lld build/src/libtest_lib.a -o kernel 
$ file kernel
kernel: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, not stripped
```

* Tried to specific `i686-linux-elf`, which works for linux

```shell
$ clang -target i686-none-linux-elf build/src/libtest_lib.a -o kernel -ffreestanding -nostdlib -fuse-ld=/opt/llvm-20/bin/ld.lld -v
clang version 20.1.5 (https://github.com/llvm/llvm-project 7b09d7b446383b71b63d429b21ee45ba389c5134)
Target: i686-none-linux-elf
Thread model: posix
InstalledDir: /opt/llvm-20/bin
 "/opt/llvm-20/bin/ld.lld" --hash-style=gnu --eh-frame-hdr -m elf_i386 -pie -dynamic-linker /lib/ld-linux.so.2 -o kernel -L/usr/lib build/src/libtest_lib.a
...
```
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzkWN1v47gR_2vol4EEmvLngx-88RldNO0BTa69PgWUOLLYUKRAUo793xdDyYnTbnY3zeGw6BmGPvgxnPnNzG9IyRD0wSJu2PwTm-8mso-N8xuLjy7rpJeT0qnz5h8NWojSHzBGbQ-gF6tFhqYGJlbOD6_WWaQ2Jm6gdR4hdFjpWlfSmDMTa2qvjLQHCFEbA30gSWzBmdj3wTOxL7VlYn-oKrbgIAPEBsFo-0jjlNdH9CTjqdFVA9pWznusojmDttE71VcIraxcyJw1Z3Bd1M6GnPEt_Rd8-IcGjaEGMRu1yY6Mb4fHI_qgnQXB82k-J-OaGLvAii0Te1JNx6Yv88q1TOyNOV5uWefdv7CKsCz5Wi3L2WxRrIpyOS0XhZqJdSmmiLN5KYvVuppPixnBwbf3CVBWbAcAe_to3ZN9vhOWfHvfeJQKWqfQ0NDOBX1ifPvZhiiNQbXTntqZ2LsuXhQSfMTzyvQRCbEFXUMfEMI5RGwTxOi_jdPg_ytnXzwOZa-NYmIffEUK6DJiiA9Gl7mEzMEjeosGsrr2iCFKq8ijmXUhKqNLyI7wfb8fxFGvjP8tXARMiC9kgRDXILWFuALzK5AzvjWK1nuS3mp7oMf7BkEXqwVIXzU6YhV7j6ADKOw8VjKigtp5SqCf7whPj607ItTetSkPf62cwmFVCAMLkNzt327-dDeA9F9r6oN1njxda4NfVVjcDN1p8EWLLOlb9hFkjNh2iXiiS-EKTzo2L3JjmvWSP6HvOueTTTSkdr6VkawCfhJT4KfiBvhpQU9LQU8FXai3-An4iW9p3J4u_BuXwfRfrMJaW1QQzm3pTEj6vIa6WC0oPPkWyNsPrSQ3CzLdY40ebUXqeteOo3TbGV3pCGijPxNwUfo4wqMt4AmrPsrS4DP2w-JMrAITa7CORvdWvaHMmEs0Eb13KUIHKoDKta2kiVIbVAPYeNIRUhBMCUnij-xI_giIoO3RVZIIdwDkTclMrI5aQoru9cfXeZvbjFFQYtAK_4PYfi9Oq_uAGfll90bai71ROal5ob8_NLu9A673ESHNeRWJI02A9Ie-RUu8sMzU2cpWV0wsKSOVVnB2PbQober-dNX__UIp5943ozMyEls9jCHwvtnhHIwuvXPxK_OIMSidam0V0HDpz5CZ6B7Gly9PZGK_7YiRUvYFJvapIuSy65jY3zgb0UZq3uERjetor7a_d85UjdQv43dYy97E_FTFS99zaBhdDtfb-59zdabXK0sTk8dzh1_Wr5KWCM91aC9cC391EPpqrBPOg9K0YXRvmXgtIm0kPyhjOst5zj8uZP5BEUzsb0fXvnbPzUC_t9oieYqcdLf7M93-QgX4V1o7D-qRBH4OIF8t-n9ZPH6hyjHQzGArnVwuR44n5x8DVL33aKnj7Q3zKOL7Ssg4Jzl2aGJ8Oz4UW_jpdg-FyEod4fbu03XZFzfw2UY0sOIU8OLmuXAk4-_-eff38dgVoozDOWyAUlEjxUeIXncdqi-jce81qoTeeJKj01qqEUbb_pTqAx3fXgNEu43U_z-cKJ7l_q7l90cqvC_I_naV92vmpzKcNTI0WYhng6zYHWwPWYZNVnvZYtYoD1kLaOqHtCPPOo1wKZjZc2pe6FsNJuTB5ddlOru95vlvVO08z68jZ6I2hVoXaznBzXQ5Wy7FtBDLSbNZqWo6XwghFqqcCTHja6zW62I2F8u6nE3lRG8EF3M-F5wv-Gq2zGWxWtYzrGte8lKpNZtxbKU2OaGTO3-Y6BB63ExnfLEqJkaWaEL6NiLEwEtCsPlu4jcJzrI_BDbjRocYXkREHU36oDLMmO8gfT-pvAuBaKvTZjzLlNIjtJKS2F2KzvNnEmme5Dmk3ewpcdrYHIYj0PBFJJ_03mzeF6ZM7JOVxPSjoceN-HcAAAD__-LhxfQ">