Latest Cemu Commit Does Not Launch At All

[HurricanePootis]

Current Behavior

Build Environment

Building on commit a02ba9d
Build command:

cmake -B build -S cemu -GNinja -DENABLE_VCPKG=OFF -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_EXE_LINKER_FLAGS_INIT="-fuse-ld=lld" -DCMAKE_SHARED_LINKER_FLAGS_INIT="-fuse-ld=lld" -DCMAKE_C_FLAGS_INIT="-flto=thin -g" -DCMAKE_CXX_FLAGS_INIT="-flto=thin -g"

cmake --build build

I have ensured that I have no missing build dependencies nor runtime dependencies installed on my system right now; I check the cmake output and nothing is missing.

Error

The program gives me the following error when I go to start it:

Error: signal 6:
/usr/lib/libc.so.6(+0x9a29c) [0x7f7c52e9a29c]
/usr/lib/libc.so.6(+0x3e8f0) [0x7f7c52e3e8f0]
/usr/lib/libc.so.6(+0x9a29c) [0x7f7c52e9a29c]
/usr/lib/libc.so.6(gsignal+0x20) [0x7f7c52e3e7d0]+0x20) [0x7f7c52e3e7d0]
/usr/lib/libc.so.6(abort+0x26) [0x7f7c52e25681]+0x26) [0x7f7c52e25681]
/usr/lib/libstdc++.so.6(+0x9ac50) [0x7f7c5329ac50]
/usr/lib/libstdc++.so.6(+0xb673a) [0x7f7c532b673a]
/usr/lib/libstdc++.so.6(_ZSt10unexpectedv+0) [0x7f7c5329a5e9]+0) [0x7f7c5329a5e9]
/usr/lib/libstdc++.so.6(+0xb69f6) [0x7f7c532b69f6]
./Cemu_(SDLControllerProvider::InitSDL()+0x21a) [0x5569252be67a]
./Cemu_(SDLControllerProvider::event_thread()+0x30) [0x5569252bd830]
./Cemu_(void std::__invoke_impl<void, void (SDLControllerProvider::*)(), SDLControllerProvider*>(std::__invoke_memfun_deref, void (SDLControllerProvider::*&&)(), SDLControllerProvider*&&)+0x41) [0x5569252bf7e1]
./Cemu_(std::__invoke_result<void (SDLControllerProvider::*)(), SDLControllerProvider*>::type std::__invoke<void (SDLControllerProvider::*)(), SDLControllerProvider*>(void (SDLControllerProvider::*&&)(), SDLControllerProvider*&&)+0x1d) [0x5569252bf74d]
./Cemu_(void std::thread::_Invoker<std::tuple<void (SDLControllerProvider::*)(), SDLControllerProvider*> >::_M_invoke<0ul, 1ul>(std::_Index_tuple<0ul, 1ul>)+0x31) [0x5569252bf721]
./Cemu_(std::thread::_Invoker<std::tuple<void (SDLControllerProvider::*)(), SDLControllerProvider*> >::operator()()+0x15) [0x5569252bf6e5]
./Cemu_(std::thread::_State_impl<std::thread::_Invoker<std::tuple<void (SDLControllerProvider::*)(), SDLControllerProvider*> > >::_M_run()+0x19) [0x5569252bf5c9]
/usr/lib/libstdc++.so.6(+0xeb919) [0x7f7c532eb919]
/usr/lib/libc.so.6(+0x981b9) [0x7f7c52e981b9]
/usr/lib/libc.so.6(+0x11d21c) [0x7f7c52f1d21c]

-----------------------------------------
   Game info
-----------------------------------------
Not running

-----------------------------------------
   Active PPC instance
-----------------------------------------
Not active

-----------------------------------------
   PPC threads
-----------------------------------------
None active

GDB gives the following backtrace:

Thread 13 "SDL_events" received signal SIGABRT, Aborted.
[Switching to Thread 0x7fffdcbfb6c0 (LWP 34316)]
__pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44
44            return INTERNAL_SYSCALL_ERROR_P (ret) ? INTERNAL_SYSCALL_ERRNO (ret) : 0;
(gdb) bt
#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44
#1  0x00007ffff369a363 in __pthread_kill_internal (threadid=<optimized out>, signo=6) at pthread_kill.c:89
#2  0x00007ffff363e7d0 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#3  0x00007ffff3625681 in __GI_abort () at abort.c:77
#4  0x00007ffff3a9ac50 in __gnu_cxx::__verbose_terminate_handler () at /usr/src/debug/gcc/gcc/libstdc++-v3/libsupc++/vterminate.cc:95
#5  0x00007ffff3ab673a in __cxxabiv1::__terminate (handler=<optimized out>) at /usr/src/debug/gcc/gcc/libstdc++-v3/libsupc++/eh_terminate.cc:48
#6  0x00007ffff3a9a5e9 in std::terminate () at /usr/src/debug/gcc/gcc/libstdc++-v3/libsupc++/eh_terminate.cc:58
#7  0x00007ffff3ab69f6 in __cxxabiv1::__cxa_throw (obj=<optimized out>, tinfo=0x7ffff3cc38d0 <typeinfo for std::runtime_error>, dest=0x7ffff3acf110 <std::runtime_error::~runtime_error()>)
    at /usr/src/debug/gcc/gcc/libstdc++-v3/libsupc++/eh_throw.cc:98
#8  0x000055555664067a in SDLControllerProvider::InitSDL () at /home/hurricane/git/cemu/src/input/api/SDL/SDLControllerProvider.cpp:132
#9  0x000055555663f830 in SDLControllerProvider::event_thread (this=0x555556fbe010) at /home/hurricane/git/cemu/src/input/api/SDL/SDLControllerProvider.cpp:292
#10 0x00005555566417e1 in std::__invoke_impl<void, void (SDLControllerProvider::*)(), SDLControllerProvider*>
    (__f=@0x555556f3a2e0: (void (SDLControllerProvider::*)(class SDLControllerProvider * const)) 0x55555663f800 <SDLControllerProvider::event_thread()>, __t=@0x555556f3a2d8: 0x555556fbe010)
    at /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/16.1.1/../../../../include/c++/16.1.1/bits/invoke.h:76
#11 0x000055555664174d in std::__invoke<void (SDLControllerProvider::*)(), SDLControllerProvider*>
    (__fn=@0x555556f3a2e0: (void (SDLControllerProvider::*)(class SDLControllerProvider * const)) 0x55555663f800 <SDLControllerProvider::event_thread()>, __args=@0x555556f3a2d8: 0x555556fbe010)
    at /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/16.1.1/../../../../include/c++/16.1.1/bits/invoke.h:98
#12 0x0000555556641721 in std::thread::_Invoker<std::tuple<void (SDLControllerProvider::*)(), SDLControllerProvider*> >::_M_invoke<0ul, 1ul> (this=0x555556f3a2d8)
    at /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/16.1.1/../../../../include/c++/16.1.1/bits/std_thread.h:303
#13 0x00005555566416e5 in std::thread::_Invoker<std::tuple<void (SDLControllerProvider::*)(), SDLControllerProvider*> >::operator() (this=0x555556f3a2d8)
    at /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/16.1.1/../../../../include/c++/16.1.1/bits/std_thread.h:310
#14 0x00005555566415c9 in std::thread::_State_impl<std::thread::_Invoker<std::tuple<void (SDLControllerProvider::*)(), SDLControllerProvider*> > >::_M_run (this=0x555556f3a2d0)
    at /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/16.1.1/../../../../include/c++/16.1.1/bits/std_thread.h:255
#15 0x00007ffff3aeb919 in std::execute_native_thread_routine (__p=0x555556f3a2d0) at /usr/src/debug/gcc/gcc/libstdc++-v3/src/c++11/thread.cc:105
#16 0x00007ffff36981b9 in start_thread (arg=<optimized out>) at pthread_create.c:454
#17 0x00007ffff371d21c in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

Expected Behavior

For Cemu to launch.

Steps to Reproduce

1. Be on Arch Linux, latest everything
2. git clone Cemu and setup up a build with Clang + LLD + ThinLTO
3. Build Cemu

System Info (Optional)

Arch Linux
KDE 6.6.5
Mesa 26.1.2-2
Clang + LLVM 22.1.5
glibc 2.43+r22+g8362e8ce10b2
GCC 16.1.1+r12+g301eb08fa2c5
SDL2 2.32.10
SDL3 3.4.8
SDL2-Compat (Tried it with this as well) 2.32.68

Emulation Settings (Optional)

No response

Logs (Optional)

No response

[concept8192]

if it's not a release then you shouldn't expect it to function at all. just wait and someone will patch it

[HurricanePootis]

I understand it's not a release. I'm trying to debug another issue with a shader thing on the 2.6 release, so I'm trying to see if it was fixed on the latest HEAD.

[Exzap]

This seems to be the same issue as #1933
For some reason SDL_InitSubSystem fails without returning a useful error. You could try building with vcpkg enabled, if that stops the crash then it would narrow it down to some dependency interaction. Otherwise it's possibly an upstream issue.

If you know how to debug an application, could you try stepping into SDL_InitSubSystem to figure out where exactly it fails?

[HurricanePootis]

I just built with vcpkg enabled and was able to launch a game with Cemu. I'm now gonna debug and see why it fails without vcpkg.

[qurious-pixel]

@HurricanePootis
You have many fatal errors and missing symbols.

Make sure you have wxWidgets 3.3 or above.
It can be found in the AUR or building from source (I did this).

Built using your flags for CachyOS like this:

sudo pacman -S --needed base-devel bluez-libs clang cmake freeglut git glm gtk3 libgcrypt libpulse libsecret linux-headers llvm nasm ninja systemd unzip zip wayland-protocols lld pugixml sdl3 rapidjson boost-libs boost glslang zstd fmt libzip libpng openssl wget

git clone --recursive https://github.com/cemu-project/Cemu

cd Cemu

cmake -B build -S . -GNinja -DENABLE_VCPKG=OFF -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_EXE_LINKER_FLAGS_INIT="-fuse-ld=lld" -DCMAKE_SHARED_LINKER_FLAGS_INIT="-fuse-ld=lld" -DCMAKE_C_FLAGS_INIT="-flto=thin -g" -DCMAKE_CXX_FLAGS_INIT="-flto=thin -g"

cmake --build build

[Patola]

This issue is definitely a duplicate of #1933 so let me paste the workaround:

launch Cemu with:

LD_PRELOAD=/usr/lib/libSDL3.so.0 Cemu

As for the explanation, see it on 1933.