<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/64150>64150</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [MLIR] Build broken on Windows with GNU tools.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          carlo-bramini
      </td>
    </tr>
</table>

<pre>
    I tried to build mlir on Windows, but I got many errors on undefined references when linking `mlir-tblgen.exe`:


If you look the attached screenshot, you can see that I have highlighted `lib/libMLIRTableGen.a`.
This is a static library and it is the cause of the problem, because it has not its dependencies satisfied.
By looking into the generated build.ninja file, I have found this line, which provides the above libraries when linking:

```
LINK_LIBRARIES = lib/libLLVMCodeGenTypes.dll.a  lib/libMLIRTblgenLib.a lib/libLLVMTableGen.dll.a  lib/libLLVMSupport.dll.a lib/libLLVMDemangle.dll.a  lib/libMLIRTableGen.a
```

I just did a quick hack to this file, by changing the above line to:

```
LINK_LIBRARIES = lib/libMLIRTblgenLib.a lib/libMLIRTableGen.a lib/libLLVMCodeGenTypes.dll.a lib/libLLVMTableGen.dll.a  lib/libLLVMSupport.dll.a lib/libLLVMDemangle.dll.a
```

After that, `mlir-tblgen.exe` has been linked successfully.
Actually, the libraries should respect some order when linking, something like:

```
static_lib1.a import_deps_for_lib1.dll.a   static_lib2.a import_deps_for_lib2.dll.a ...etc
```

or all static libraries and then all import libraries if you prefer.
It is interesting to notice that `lib/libMLIRTblgenLib.a` and `lib/libMLIRTableGen.a` cannot be swapped, `lib/libMLIRTblgenLib.a` must be written before `lib/libMLIRTableGen.a`, otherwise you will got lot of undefined references again.
Evidently, one static library is also a dependency for the other one.
MSVC does not seem to suffer about this behaviour on libraries at link time.

I configured the sources according to the guidelines, by using this command line:

```
cmake ../a/llvm-project/llvm -G Ninja -DCMAKE_BUILD_TYPE=Release -Wno-dev -DBUILD_SHARED_LIBS=ON -DLLVM_ENABLE_PROJECTS="lld;clang;clang-tools-extra;bolt;cross-project-tests;polly;libclc;mlir"
```

This effect happens with GCC for CYGWIN and MinGW-w64 cross compiler.
I'm using `-DBUILD_SHARED_LIBS=ON` on the command line since this is the only way to bypass issue #60659 for me.

</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJy0Vk1v2zAS_TX0ZSBBlizZPvgQfyTrrZMWSdqgJ4MURxYbitSSVFz_-wUp5bOpF7vAAkEEeSjOzJs3b4ZaKw4KcUHyJcnXI9q5WptFSY3UETO0EUqMmOanxRacEcjBaWCdkBwaKQxoBQ9CcX20JF0B6xxs4aAdNFSdAI3RxvozneJYCYUcDFZoUJVo4VijAinUo1AHIEXiL4wckwdUMf5GUiQkuyDJmiTP_9MxyZdSPjWRP0vyNUlntXOt9QfTS5JeHoSrOxaXuiHppT85PKLW6F9YOpJeUmvRWZJeZsk8nyfJlKSXrGBpns1nUVVNWDQZ4ySa5eNJVFTzpMyyIs-TMUnnb4PZVnDSHUitH8HVCNQ5WtbIwZYGUdlaOw-JP1NSBRYRXE09PjV9QqjFoZbiUDvkPncpmI9UsOvd9vaeMolXqGJKiiTu3d3XwoKwQME66kQJUjBDzQmo4iCcN_koStpZBF2Fl9ZoJrEJlcHeIhzU1ILSDoSzwLFFxVGVAi1Y6oStBPLB5fIUsvPVEcrpcOUBFRrqgw4kiJVQvyhUQqL3MuRW6U5xcD5iKVSwHGtR1j6gJ8GxD5Uy_YRDGuIDHT4WvkiGv_C629582e-2y9uL2-3mDki2hhf8drsf1yvNPXz3pxZtzKWMKcB7gAPJdoLF9P2XL8h__Mob77q21cYNtnemNTZUHSR-7u21nJ9lM9AJfnXWARccKPyrE-Uj1LR8hIC7sC8QsxOUNVUHX5W3KCoEp_932P6KyvsE_iPO_wc0z4B2UTk0oa08NJ9KSKA7w4Favj27skRrq07K00D0i9J1VMqTv8Rj-spJW-tOetGyLZYOrG4QtOFo3rM1XQWTq31VpHjE84XoO3gvBRvHFETjcdhzbO2-0qb_eUAMXo-mnx9Nh6NxHKMrz2ClDVAp36uHT5GGVkUVrL2DN1bRq1wbZHuAaxvURiiHBq0LRNReUUQ5SNwfevZKLF8R7_Gs5HnB9ArFEOyRti3yobznbm18-zCEoxHOoQKGlTZ43pG_VrsazVFYDIkehZRhgEntvIx-OrjogQo1gLHxgqZcTx6t8KM8e8mWVgN91doTVNoEogXf_qvhsuu7HyvgGnuBtoiNh9Z2VYXGd3rnejFgWNMnobswf9-U0gVGghPN843P4lJqVYlDZzAUG6zuTMikLLXhQwmDvneCo1cTO4hNZ3ulERZK3TS-dkHTzxK8bOgjQhz7afvnAPavEF3BTZgd0Xp1ffFls19-3-7W-_uf3zYkW9-iRGoRogelI45PEK17-90_Lm43a69idyRbf72BaO0VY7-5uVjuNvtvt1__uVndextJUyk5yZalpH6g9M_IaS1thL-doSRbMi2dNxlt7XOEkUPrLMmWrfaakC2lYKUsSbYMS0eanmmyMKWxqrxY1J65ysJRuBquVqtQ9dXPq4ftTWiBa6GuHqJjMYHg3sPbCvnaZSSdNgP8pEj-BoCnvlb97H9TH7BChXbst4ZANiVPcKSnsMGdWmq9xXYIJM2KpMjnIcAX5oz4IuPzbE5HuBgX82Qymc3zZFQvZrOcpTxhlE2nxRSnPJvPWJblaTXOxxlPR2KRJmmWTNNpMk_m4yRm42paTorJrBjzgtKKTBJsqJCxZ0KszWEUAlkUk3GejCRlKG1YSNNU4bGP0uOer0dmEcjEuoMlk0QK6-zrLU44GTZZ3-gkX8MyLKrM6EdUb1bVoSQ33yGwIR51Ri7-6z0yhOX3yBD2vwMAAP__WjOnWg">