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<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Thank you for this Aaron!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">In our company we rely heavily on the compatibility between Clang-Cl and the Visual Studio compiler, lately we encountered big problems with the handling of SEH exceptions in our code,
so running those tests helped us. (Sadly we can’t move to the Visual Studio compiler)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">However, maybe it helps someone if I share the results from running those tests… I imported all of the tests into separated projects, compiling them with the same settings, with MSVC
(v141) and Clang (9), then I compared the output. The compiler settings for all those projects were:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">/permissive- /GS /GL /W3 /Gy /Zc:wchar_t /Gm- /Ox /Ob2 /sdl /Zc:inline /fp:precise /D "_MBCS" /errorReport:prompt /GF- /WX- /Zc:forScope /Gd /Oy /Oi /MD /FC /EHsc /nologo /Ot /diagnostics:classic<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">The MSVC compiler only failed the following test:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">EH:<br>
ihateeh.cxx <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Clang however failed multiple tests:<br>
EH:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">ihateeh.cxx
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">SEH:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">seh0007.c (-> Test failed; The access violation was optimized away, leading to a random result; – forcing the access violation caused no catching of the exception)<br>
seh0019.c (-> No exception caught; Which makes sense because there are no catch handler, but MSVC does catch them)<br>
seh0055.c (-> Test failed; The result is not correct)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">sehframes.cpp (-> A certain exception was not caught)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">The following tests didn’t even compiled, instead they crashed the compiler:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">seh0034.c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">seh0035.c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">seh0036.c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">seh0041.c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">seh0042.c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">seh0043.c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">seh0048.c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">seh0049.c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">seh0050.c<br>
xcpt4u.c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">I hope that helped in some way – any comments or suggestions? I’m up for it!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> llvm-dev <llvm-dev-bounces@lists.llvm.org>
<b>On Behalf Of </b>Aaron Smith via llvm-dev<br>
<b>Sent:</b> 11 November 2019 23:03<br>
<b>To:</b> llvm-dev@lists.llvm.org<br>
<b>Subject:</b> [llvm-dev] Exceptions on Windows & MSVC<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">At Microsoft we open sourced some of our compiler tests for exception handling on github.<o:p></o:p></p>
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<p class="MsoNormal"><a href="https://github.com/microsoft/compiler-tests">https://github.com/microsoft/compiler-tests</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">We are looking into what it would take to get these to work with clang-cl. I’m planning to share a design document on the mailing list soon.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Aaron<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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