<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/64247>64247</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            SingleSource/Regression/C/Regression-C-float16-smoke FAILs to link
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            test-suite
      </td>
    </tr>

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

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

<pre>
    When building LLVM 17.0.0 rc1 on both Linux/x86_64 (Ubuntu 20.04) and Solaris 11.4/amd64, the `SingleSource/Regression/C/Regression-C-float16-smoke` test `FAIL`ed to link:
```
FAILED: SingleSource/Regression/C/Regression-C-float16-smoke 
[...]
Undefined first referenced
 symbol in file
__extendhfsf2 SingleSource/Regression/C/CMakeFiles/Regression-C-float16-smoke.dir/float16-smoke.c.o
__truncsfhf2 SingleSource/Regression/C/CMakeFiles/Regression-C-float16-smoke.dir/float16-smoke.c.o
ld: fatal: symbol referencing errors
```
The issue is the same, although the root cause is different in both cases. Those functions live in `libgcc` and were only introduced in GCC 12.
- However, on Ubuntu 20.04 the newest available version of GCC is 10.
- On Solaris 11.4, several versions of GCC are bundled in parallel, up to and including GCC 12 (which would be enough). However, there's a bug in `clang` that doesn't select the **newest** version of GCC available but a random one (first in directory order), so on the build machine GCC 10 was chosen.

This test somehow needs to check for the availability of those functions.  This `test-suite` build failure is a regression from LLVM 16.
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJy8VV9v47YT_DT0y8ICRcty9KAHn_PTrwVyLdDk2seAIlciG4oM-CdOvn1Byr5LDkULtEABw5ZocnZ2NLPiIejZIvZk_4kw9vCT81G5F_SEMbK_3fAUlfO9z8ub0cm3_jeFFsakjdR2hru7Xz9DfahoRcGLGpyF0UUFd9qmV8KG15v2sW2AsJsvY7IxAaMVbQjrgFsJ985wrwPUddUQNvBFtg1hJ4gKgbT0XtvZ4L1LXiBhwy84ewxBO0vYcPqwsD1tJ-N4rNttWNwTkpZCxBAzynD88Y60FCVEB0bbJ7I7EnpL6JG09PIpt3nj_27J7gj_vDBckPefqqoi-9v19ouVOGmLEibtQwSPE3q0AuX6P4S3ZXQGtIVJG1wXHx_xNaKVagoT-1tKp8_8CQdtMPwlv0pqT9jwcU1U7loy-mRFmNR_VdHIrPfEIzf54qLDVZ_sMPTe-fCnD-xBIegQUv4ungl8wewfbqJyaVZl0TsXQfAUyjapp4Ids9jFqoIHDBU8KBcQpmRF1M4GMPoF8x7SUqPHWYjsqWzaM3oEZ80baBu9k0mgzBv_fzpBzaqV2hZ-cGcsOTrlULx3f2Fl8Zz9yV-4Nnw0CC_os3zgpoKUU0G_gv1sv8vKCUJG5-Z6LlwPco8wJivNyuqZe24MmnwkPecI5B60FSaVAK-sc0DPSgsFZ5eMhBEBbVaQsK5630pU6JGwQwAOY5ovAgnD7Vwyp3gE6TBYwg4RAhoUcY0zOxJ2XLter7_v-JsUY4rAwXMr3QLO5sM3a3C0Bak9iuj8GzgvM6muqOGyyrlQGU2wcKG0xbU9CmceQOQHbC-SXg2UjZOfQ3ALKncGiyhDVkkoFE8wOV9AL9y00fEt840fzVIBFCjS0oy2DUnHMoNWMhPXJvliPw7-a1Jg8m65TNC22sh-J7tdxzfY121HDx2r991G9R22E232ot6zXTOyUbSyk-Kwn2QtxxvWbXTPKNvRw66mN6yru6qTomO7tt11BxwbeSANxYVrUxnzslTOz5uSmr5tWHPYGD6iCZcXwDv66wvA9_nQdkxzIA01OsTwDSbqaLD_F9Myj9xwncub5E2vYnwOeUKzgbBh1lGlsRJuIWzIZS8_22fvfkcRCRtKK3kElW7-CAAA___gUjjo">