| Issue |
134725
|
| Summary |
LTO build of rpcs3 fails on Windows
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
oltolm
|
Hello I use clang 19.1.7 from MSYS2 clang64. Recently https://github.com/RPCS3/rpcs3 has enabled LTO. Now the release build is failing with
```
[build] ld.lld: error: undefined symbol: thread-local initialization routine for perf_stat<19226358023673171ull>::g_tls_perf_stat
[build] >>> referenced by C:/src/rpcs3/rpcs3/Emu/CPU/CPUThread.cpp
[build] >>> librpcs3_emu.a(CPUThread.cpp.obj)
[build] >>> referenced by C:/src/rpcs3/rpcs3/Emu/Memory/vm.cpp
[build] >>> librpcs3_emu.a(vm.cpp.obj)
[build]
```
I reduced it
`CMakeListsts.txt`
```cmake
cmake_minimum_required(VERSION 3.21)
project(lto VERSION 0.0.1 LANGUAGES C CXX)
add_executable(myexe src/myexe.cpp)
target_compile_features(myexe PRIVATE cxx_std_20)
target_link_options(myexe PRIVATE -municode)
set_property(TARGET myexe PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
```
`myexe.cpp`
```c++
#include "perf_meter.hpp"
int wmain(int argc, wchar_t** argv)
{
perf_meter<"DMA"_u32> perf_;
return 0;
}
```
`perf_meter.hpp`
```c++
template <auto ShortName> class perf_stat final {
static inline thread_local struct perf_stat_local {
// Local non-atomic values for increments
unsigned m_log[66]{};
perf_stat_local() noexcept {}
~perf_stat_local() {}
} g_tls_perf_stat;
public:
static void push(unsigned start_time) noexcept { (void)g_tls_perf_stat; }
};
template <auto ShortName, auto... SubEvents> class perf_meter {
public:
~perf_meter() { perf_stat<ShortName>::push(0); }
};
constexpr unsigned operator""_u32(const char* s, unsigned long long /*length*/)
{
return 0;
}
```
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