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<p class="MsoNormal">Clang appears to be correct here, parameters in a constexpr function are not themselves constexpr. SO, accessing ‘data’ isn’t legal. I don’t know why the other compilers wouldn’t diagnose this.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I presume you’re getting this from a case where TrivialOutputMessage’s constructor takes a template parameter (and you’ve over-reduced), but you’d want to do something more like this : https://godbolt.org/z/uBSWt5<o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> cfe-dev <cfe-dev-bounces@lists.llvm.org> <b>On Behalf Of
</b>Umesh Kalappa via cfe-dev<br>
<b>Sent:</b> Monday, June 1, 2020 7:27 AM<br>
<b>To:</b> cfe-dev@lists.llvm.org Developers <cfe-dev@lists.llvm.org><br>
<b>Subject:</b> [cfe-dev] static_assert : expression is not an integral constant expression<o:p></o:p></p>
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<p class="MsoNormal">Hi Everyone, <o:p></o:p></p>
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<p class="MsoNormal">For the below sample,<o:p></o:p></p>
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<p class="MsoNormal"><a href="https://godbolt.org/z/zugh_5">https://godbolt.org/z/zugh_5</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Clang popping up with an error , not the GCC or any other compiler out there.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">For us, it looks like a frontend issue, that needs a fix.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thank you <o:p></o:p></p>
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<p class="MsoNormal">~Umesh<o:p></o:p></p>
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