slydiman wrote:
Note `-ffunction-sections -fdata-sections` are added in HandleLLVMOptions.cmake
and `-Wl,--gc-sections` is added in AddLLVM.cmake by default. But unused
functions will be kept anyway if they contain linker gc roots.
A lot of functions in CPlusPlusLanguage.cpp contain static variables like
```
static constexpr const char *const libcxx_std_unique_ptr_regex =
"^std::__[[:alnum:]]+::unique_ptr<.+>$";
```
or
```
lldb::TypeCategoryImplSP CPlusPlusLanguage::GetFormatters() {
static llvm::once_flag g_initialize;
static TypeCategoryImplSP g_category;
...
}
```
These functions depend on BlockPointer.cpp, BlockPointer.cpp depends on
TypeSystemClang.cpp, etc.
To avoid changes that may bring the problem back, I suggest to place moved
functions to a subclass.
https://github.com/llvm/llvm-project/pull/132274
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