<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/129904>129904</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang frontend failed at clang::ASTContext::forEachMultiversionedFunctionVersion()
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          bi6c
      </td>
    </tr>
</table>

<pre>
    Compiler Explorer: https://godbolt.org/z/qPxYh9Td4

```console
<source>:10:58: error: parameter 'b' was not declared, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
   10 | int __attribute__((target_clones("default,avx"))) foo(a, b)
      | ^
   11 | struct foo a;
   12 | {
<source>:10:51: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C23 [-Wdeprecated-non-prototype]
   10 | int __attribute__((target_clones("default,avx"))) foo(a, b)
      | ^
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1.      <eof> parser at end of file
2.      Per-file LLVM IR generation
 #0 0x0000000003e62338 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3e62338)
 #1 0x0000000003e5fff4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3e5fff4)
 #2 0x0000000003dac928 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x0000762533c42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x000000000735a4ce clang::ASTContext::forEachMultiversionedFunctionVersion(clang::FunctionDecl const*, llvm::function_ref<void (clang::FunctionDecl*)>) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x735a4ce)
 #5 0x000000000442bd2d clang::CodeGen::CodeGenModule::emitMultiVersionFunctions() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x442bd2d)
 #6 0x000000000442dff8 clang::CodeGen::CodeGenModule::Release() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x442dff8)
 #7 0x000000000482760e (anonymous namespace)::CodeGeneratorImpl::HandleTranslationUnit(clang::ASTContext&) ModuleBuilder.cpp:0:0
 #8 0x0000000004823f75 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4823f75)
 #9 0x000000000641621c clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x641621c)
#10 0x0000000004824728 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4824728)
#11 0x0000000004aec505 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4aec505)
#12 0x0000000004a6fcde clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4a6fcde)
#13 0x0000000004bdad8e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4bdad8e)
#14 0x0000000000d4f5cf cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xd4f5cf)
#15 0x0000000000d46eea ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#16 0x000000000486c659 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#17 0x0000000003dacdd4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3dacdd4)
#18 0x000000000486cc4f clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#19 0x000000000482f86d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x482f86d)
#20 0x00000000048308ee clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x48308ee)
#21 0x0000000004838885 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4838885)
#22 0x0000000000d4c3c3 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xd4c3c3)
#23 0x0000000000c13ae4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc13ae4)
#24 0x0000762533c29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#25 0x0000762533c29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#26 0x0000000000d46995 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xd46995)
clang: error: clang frontend command failed with exit code 139 (use -v to see invocation)
Compiler returned: 139
```
Code:
```c
#define int unsigned

struct foo {
  int aa : 1;
  int a : 9;
  int c : 16;
  int d : 6;
};

int __attribute__((target_clones("default,avx"))) foo(a, b)
struct foo a;
{
  return a.d == 0;
}
```
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzkWV9z27gR_zTwC4YaCvwj8sEPsmy1ucnNZWL3On3SgMBSQgMBLAA6cj99BwBlkoqd3l2V9qEZZSwtF4vf_naxWALUWrFXALeouEPF_Q3t3UGb20aU7KbR_OV2o4-dkGDww6mT2oBB2RofnOssytaIbBHZ7jVvtHQLbfaIbP-JyPYfn05_O9RPPEfp2n_KNH6YVlZL8KJsY3VvGKDsAWXrZYqydVF522CMDpN01NAjODAYkVWDyAp_pRYr7TAHJqkBjsgGc2hpL53FTns9oRwiK5Td4Q-Pv-BNXWOqOJbUm-E6jLZ912njsDh2UjDhsFAOo-Iu-etZkngrxT1K1xjjZYrRahOUdjvqnBFN72C3Q6RCpHLU7MHtmNQKbBCRAREiG_p8QoQgUscPbrVGpKIeduNFwT7GwT4qHob5luG3daZnzg_BFGV3wzMSdVd371G49Mx9pUYJtfdfKW57xZzQyjMllAhfvwp30L3DFHdGO-1eOsDCYg6dAUYdcCwUplLiZzBWaGWxbvEmUCnslMSouSFZJHA0kCitklfj_xsyP318WD8-YNs3R-F9bfo9NhBi7_RlDgt36JsF00dEtlI-n_94H_4OzCGyFdb2HtY28qCY7DlgdwDMDLUH3FD2xRnKwEPqDHRGM7AWOB7CRCKD1FrNRGDZ9ApbZkTnFihdPzrKvmDeHzsPK12nC5TWn4zeG3rE1Oz7IyjnIWNEtrrzmNiwOhM4r06yZZKqfUKtBeODbRNnevUFkW0j1PkxTvb8KzVtkuNkjxO_dLa067zd3nW9W1icHL3_OElOVZlQe0zsi3L0hLJ7oRxInLRKJ89gGm3BP8fJI06SPWOJ01qyAxUKZfffReqVraKdPWiHk5ZpqU3CBd0rbZ1gNs4R2J2JZ5mfrpeeJ5RtQLcoe_B1w4LB1GFQ3CduK0LJIYFOMIn_jT9-_PVn_OEz3oMCQz1RPoMQyVKcntLzvwxKkmUVDhmRrVG2ti82fvlkhHIhZE8x6NWoZOjXnbbOAD0iUvrAh7pU45DU_2HsELlLTwOwIfERyZZz2EXbtvlbsDcSqOq7X9Sj2CsqEal6FbYAjqX2xq8KMsAYQZIZSE5ZTSq88fH9DEw_g3mJqP5MFZd-rmrgbaaz0crByS1Y5xdKGv5H-9lgf1WSIstYTgqSDu5I0SCyPVXlrswTKVR_Svaqjw_YwupFGSCHISPgfAp4lRU0Z4Cjg4HN9ePTgCb-brV5oOzwcy-dGGon8O1QgX-NAkSqiYXzw3tgEvv90SGy9hkzxu5cwXcGWpRtnrXg-H0jYXjtVwapo8HrBXRgYOSnmPKT56ThhE_52WgOfwI1-_Gz5r2EKIKjcIGsgZuzI7H6XzEVB2wj8vICOW_b6vcg_wwSqIUfgNMjGXGuZjgrsipT8NNRpdXLUfcWK3oE29EYlilcX9e0-XDsZBTHVfVkqLIyVLy_KOHmiTTJZ1-3ahxdvuuF5GDeWHHVBbysXRVTGu8o-wKKb7Sy_TE0j38QyPUYjiBHhuupC2W-LMmSTV345PeT9ePTHOAjHOlQ2xut5fj3ilAHMBGqr_HpBdv5iryVtOuwhqLo4QSsdzCIrp2tEcIIcLYL5RRYkc7SYWt8UBV_A-HVscXZR2xkjq1sGYc5eXG2D8o6qhi8zd_7zlw7TyPCEX82w99wyqsZ_gHp6MazZvRb1N-4GfaLK-KOyEbcsz005XlbsBYzttwdfYs4bZvWxtCXz2GTYwdqxu3Qb2YbPJeRDfY74bXhR3wj-uICfQlA8ZnqzfIprPmJD49HKuWvwF4r7xuulPP93dsYit1ZL6QSN76HuCi6HtN876pKVhZ1IOPfNw1DaxBUGJXSv7TsWuVhjikSJx7SZbPc6OORKn65Wt-Mm3WDnu787NQTMCHHGaH2QfNhCOrrgN2OnU7LZfzRUCvYzgb1gcKZshfsnKHCvw_FxxfmqJQ-_bWZPPcq67FSr187pDgEkZWkx4ZTRFYjVaQ698U_6eaNYKwue1rOp433W53r0EH06pG2IF9mXH4_blftziPWMdWry7RieYv_n9PCc73oqHGL9P341xd7cluV_F3WQrzoN3vfmcpZob4Y6BUm5WHznTmmqutZk3L1N4LB4dckIhctSpZWAL-Xjp90Y9_n4ifdfBTWzbj4Xv19jX1HhQ97eKX87fQNCfJjSQw0jSQuL0isqqp4D_D95PusBXhj73-P_P8iiVftPgMxI23kYq9mGcsixHOvcYYdCsf6mzft93biK3YXHtOIeNbTpWyZUcixx3q9KaPRccp8fkZCal7_zjOSMGQ0WFwahDzFu50fs7OOGrebOPSbp4B8MkV52YTVdYGj8WvGxpuNk57zeryNiMem7dDyYzZkeEuFBB4O1DGchE8bDniZhZzpLeDkGTuNLQAWk4bcz_F6s2LA9UaBX2B-5PTCJKhxiOfB4zVKpCUc6EM4TD-f4cX7lsndQbwqwEGJUhymOF8nBFkQ1VMRi1rlVMaDbBCh1f3wJV3_mJP8by8_zn5ErjBdeET3KLvH6QhqQtENv814ndX0Bm6Xq3y5rMsir24OtwBF2axYxduWZ2WW1fmq4HlLOGspq9rqRtySlBRplhbLVU5ItVitmobVy7ItGCM8bVCewpEKufB1Y6HN_ibcDNwuSV2n-Y2kDUh7vk8zt-EWoen3FuWpFNbZcZwTTsLtRWYNGUXdFc4ZEalveiNv__hdx-DU8y35VwAAAP__yuu1PQ">