[llvm-dev] How to force an unused function declaration in clang
Soham Sinha via llvm-dev
llvm-dev at lists.llvm.org
Mon Jun 25 17:48:31 PDT 2018
clang doesn't seem to respect __attribute__((used)) in C functions. Even if
I declare a function like the following: __attribute__((used)) void
function(), then also it doesn't declare the function in its IR file if I
don't use the function. Is there any other way to force the declaration of
"unused" function declarations with clang.
I have hacked in clang 6.0.0 in tools/clang/lib/CodeGen/CodeGenModule.cpp
file. I changed in EmitGlobal function to detect if the function has "used"
attribute and then if it has then use "GetOrCreateLLVMFunction" this to
create the function declaration. However, this hack fails in some other
cases. Therefore I am looking for a proper way to do this.
PhD Student, Department of Computer Science
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