<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/73431>73431</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang-18 crash: Target does not support the tiny CodeModel.
        </td>
    </tr>

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

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

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

<pre>
    Clang-18 with -mcmodel=tiny -c crashes on the test case.
Compiler explorer: https://godbolt.org/z/vvzjxGMjq
```
$cat mutant.c
extern int bar (void *);

int
foo (void)
{
  return bar ((void *)bar);
}

$clang-18 -mcmodel=tiny -c mutant.c
fatal error: error in backend: Target does not support the tiny CodeModel
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: clang-18 -mcmodel=tiny -c mutant.c
1. <eof> parser at end of file
 #0 0x00007ff171a1a266 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd2b266)
 #1 0x00007ff171a18170 llvm::sys::RunSignalHandlers() (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd29170)
 #2 0x00007ff171a198c4 llvm::sys::CleanupOnSignal(unsigned long) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd2a8c4)
 #3 0x00007ff1719679ae (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xc789ae)
 #4 0x00007ff17196796b (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xc7896b)
 #5 0x00007ff171a14a67 llvm::sys::Process::Exit(int, bool) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd25a67)
 #6 0x0000564ce14c8c23 (/usr/lib/llvm-18/bin/clang+0x13c23)
 #7 0x00007ff171975c4f llvm::report_fatal_error(llvm::Twine const&, bool) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xc86c4f)
 #8 0x00007ff171975b26 (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xc86b26)
 #9 0x00007ff1747b284d (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x3ac384d)
#10 0x00007ff1747b4153 (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x3ac5153)
#11 0x00007ff17a1fc993 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x1add993)
#12 0x00007ff17a5935fe (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x1e745fe)
#13 0x00007ff1791af866 clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xa90866)
#14 0x00007ff17b007645 clang::FrontendAction::Execute() (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x28e8645)
#15 0x00007ff17af85cc4 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x2866cc4)
#16 0x00007ff17b0821c0 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x29631c0)
#17 0x0000564ce14c8837 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/lib/llvm-18/bin/clang+0x13837)
#18 0x0000564ce14c5905 (/usr/lib/llvm-18/bin/clang+0x10905)
#19 0x00007ff17ac1d909 (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x24fe909)
#20 0x00007ff17196794c llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xc7894c)
#21 0x00007ff17ac1d2ae clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x24fe2ae)
#22 0x00007ff17abe50f1 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x24c60f1)
#23 0x00007ff17abe533e clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x24c633e)
#24 0x00007ff17ac0139c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x24e239c)
#25 0x0000564ce14c525c clang_main(int, char**, llvm::ToolContext const&) (/usr/lib/llvm-18/bin/clang+0x1025c)
#26 0x0000564ce14d2f32 main (/usr/lib/llvm-18/bin/clang+0x1df32)
#27 0x00007ff16fefec87 __libc_start_main /build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:344:0
#28 0x0000564ce14c21ea _start (/usr/lib/llvm-18/bin/clang+0xd1ea)
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJy8WFuT26jW_TXyC9UuBLo--MFxt2eSSiqpdCoP34sLoS03GQk0gPoyv_4rkBwLt_ukO-NzUqlE5rL3YmmzFogZI_YSYBWl76L0esEGe6f0SrCOSSWfOjUYbhaVqp9Wm5bJ_VVcoAdh79BVxztVQxvRayvkE7riiGtm7sAgJZG9A2TBWMSZgWWEryO83qiuFy1oBI99qzToiK7RnbW9ieg6ItuIbPeqrlRrl0rvI7L9JyLb-_t_fjz-8enH32OMKMPT3_EnSTizqBssk3bJx0Z4tKAlEtKiimkUkeJeiRpFZB2RMqLvpqn-XyHt-NAodRjpRo1D8mksQhrsoOUhXhiyYjoInF_PMziIB-LOcBZCb5hlLQKtlSfHPyDh8vK_QNau7RvTe7CoVmCQVBaZoe-VtiPjLuhG1fDJZ_Ehv3y8Wd_eIDNUnbCIoWrYIw3jFHVKv7B3Q7XkqovItm3vD_9d9Vr9AG4jshXGDGAiskVM1khI3g41-OT-7XukVjMOEdmgXkOvFQdjoEZGDXpsdjOZMYoLZqFGepDIcC16OxXKrWX8L1QPXe-Q-Sa8RP7PF632mnWI6f3QgbQOO3o9v_ESRXQDqonoDeqZNqARswhkjVSDGtHC9MIjQjHCjxhjnDdNnMcsZiTLkCeFriO6Nk9mfPiihbQe8rdx3cVxkGYPO2WsBtZFJHNrdwVHyrGItoPRjmFRHXiOXWslZES2y-WxS1QfP37_dBUXS6OWcUTe4ceaVCTLfpaqAxyfAC7iHJ8D_HWQt2IvWfsnk3UL2ngwF8FUxjkOMJETTGXBk3OYNi0wOfSfJ2QRKQbphalGrZL7C8FjBU8CeDSAV2Z5yeDfJ-J5UTIIEiXPEmXVZRJlVZAoPSE8YVl-vmr9vhx_3DwKG5HC1-YGVUq1FyI8ZVkewMsmeGmWcIgTXnBCX5HI73AfM6ac0CBkHlKbpzxpZisetW7nlXU3Kut8h357EBIQV9LYaYdebPm8yHjSBFiLU6wVyS6SqCKhFpTzRElekSKp_30iyjgtkplBEhrjk0xJnL7mjf46UxqnNMgU6BuLG16WdNT-qYo7Yd-NRvl5sP3gSnrWfS3YXipjBTc3ci8kTO97NuRPYDXoW2Ca333urVDSBKUxG-pc9g-Qvxg1mvUvBn1kcn9uyLFIb60Wcv8VmrD5k6qHFvwhJAg4kbDmLmY45b20ejDiHr5Cs5H2i9UR3Ry775tJEbaihdsnY6GL6I0LYWw99gxS_D3Arj-Z6Zyuf9DCwu7gd7NJNTRsaO2uhhYs_GIivfE5374Dx3MA73tfR8WoF6yuyzIspMCUWFrStHm76p9NBnmSNhAkCyymjFlTZNn8ZX1xp5D17bewWG-hY4Ee_b4unQPKSlzMTg8OZ-BQFcZ5lqRznFutpD1W1eQbwAcLv3l-OAeMFFBkSRogCyyNNUXKeRJuxfFe8V4ayySHANthExQvL8VL54XQZxmfHTEc-izktSAxx4FqjTiPi7hXnD3H_GyR_upxGdRlRmOOA9T5qU8XNEecx7uOuagzA11rzZ6cNNENv2P6oGDrSTfCNrJB4w3rleDnvl_QPIBYnEBMS5y-LSQucVhpgWsyHtclvhDFSQMlLufJCH52JEz4TKk37jr1Fbi6B_20cQX7aI_nd9ZA-xS8h2aQvpx32r-L6X5a-Jvpb6np2dNmwoM1xKeEEQbz4q61uPf3fLegTbxRXcdkfSoeZ4vpp3cob42sDVzj6IiTW8zMZrfjj49xPP6omBHcOYtwmHyJBoNdw85qJtxVcuw-Ccfa1u1IdyP_2e-GrI-i7KvZF_nFqoWwwEZI6FkVpLiJX2TaawV7ptMH-gNhOZnoBrx0UPkPQ9cnh-dLksEz3MQBGfSUDEpfLrsXyPigKvMyEx9U9VEY-9J5rGNt-x24Vfp917fzau2ZcIUyXaVeS95UUv9FCikN6ykJdy6Oaclfgns9ew7s6oxPvUT9_5DCS0k2EFqGcpeeWg5JJ9IOvngA7WVmPYnE7LapVDtp-ay03uiEmKQhrJNLdU0aSpAD9La4dUNJEHd-s84aaIAXOdrtHGE7Y5m2uynJthpEW0dku3d9V5vvHx7-r_r5kyxJ7jKZ4UD8-Og7fZwlj-iaJklE1_iY_tTgSQwMjYnftLA6BnZc1-ED8qJe0bqkJVvAKs4xLguaFeXiblXRmEDGOLCUlHWeFgRXvEzSmmd1RnK6ECuC3XWUZDgnBS6XJa3qnOA6byrCaAxRgqFjol06TEul9wv_1XSV04TGi5ZV0Br_vZ0QCQ_Id0aEROn1Qq_8Oqphb6IEt8JYc4xihW3h-Bnef3B92yfh5WLQ7er3P_r6Ffx_AAAA__-1NxtL">