clang windows segfault

[adamdusty]

Getting a segfault with a minimal test setup on windows with clang 19. Same code compiles and runs with g++ 14.2.

>clang++ --version
clang version 19.1.1
Target: x86_64-w64-windows-gnu
Thread model: posix

Minimal example

#include <snitch/snitch.hpp>

TEST_CASE("Hello world", "[tag]") {
    CHECK(1 == 1);
}

LLDB output and backtrace

* thread #1, stop reason = Exception 0xc0000005 encountered at address 0x7ff71a86764c: Access violation reading location 0x19ef1883c08
    frame #0: 0x00007ff71a86764c tests.exe`snitch::impl::try_get_current_test() at snitch_test_data.cpp:22:12
   19   }
   20  
   21   test_state* try_get_current_test() noexcept {
-> 22       return thread_current_test;
   23   }
   24
   25   void set_current_test(test_state* current) noexcept {
(lldb) bt
* thread #1, stop reason = Exception 0xc0000005 encountered at address 0x7ff71a86764c: Access violation reading location 0x19ef1883c08
  * frame #0: 0x00007ff71a86764c tests.exe`snitch::impl::try_get_current_test() at snitch_test_data.cpp:22:12
    frame #1: 0x00007ff71a8670c8 tests.exe`snitch::registry::run(this=0x00007ff71a89f040, test=0x00007ff71a89f040) at snitch_registry.cpp:500:38
    frame #2: 0x00007ff71a8678b8 tests.exe`snitch::registry::run_selected_tests(this=0x00007ff71a89f040, run_name=(_M_len = 13, _M_str = "tests.exe"), 
filter_strings=0x0000001d459eb520, predicate=0x0000001d459eb508) at snitch_registry.cpp:618:22
    frame #3: 0x00007ff71a867c02 tests.exe`snitch::registry::run_tests(this=0x00007ff71a89f040, run_name=(_M_len = 13, _M_str = "tests.exe")) at snitch_registry.cpp:695:12
    frame #4: 0x00007ff71a8680f0 tests.exe`snitch::(anonymous namespace)::run_tests_impl(r=0x00007ff71a89f040, args=0x0000001d459efdc0) at snitch_registry.cpp:780:22
    frame #5: 0x00007ff71a864f72 tests.exe`snitch::registry::run_tests(this=0x00007ff71a89f040, args=0x0000001d459efdc0) at snitch_registry.cpp:788:26
    frame #6: 0x00007ff71a86493f tests.exe`main(argc=1, argv=0x0000019f17029a80) at snitch_main.cpp:13:26
    frame #7: 0x00007ff71a861340 tests.exe`__tmainCRTStartup + 492
    frame #8: 0x00007ff71a861146 tests.exe`.l_start + 18
    frame #9: 0x00007ffdea747374 kernel32.dll`BaseThreadInitThunk + 20
    frame #10: 0x00007ffdeb3fcc91 ntdll.dll`RtlUserThreadStart + 33

[cschreib]

I am unable to reproduce so far, but I have only tested clang-16. While I try with clang-19, would you mind posting the content of snitch_config.hpp?

[cschreib]

I tried clang-19 (the exact same version as you) on Windows and still running OK. I think I'm going to need more info:

• the content of snitch_config.hpp
• the full command line used to build the library and the test application, or the sequence of commands used to build (with cmake etc.)

Another possibility is that you are using a different set of build options between the compiled snitch library and your test application. This shouldn't happen in normal use, but perhaps there's an issue with your build setup.