[llvm-dev] Disabling LLVM_ATTRIBUTE_ALWAYS_INLINE for development? (original) (raw)

Brian Gesiak via llvm-dev llvm-dev at lists.llvm.org
Sat Dec 15 10:32:57 PST 2018

Hello all!

I find that using lldb to debug LLVM libraries can be super frustrating, because a lot of LLVM classes, like the constructor for StringRef, are marked LLVM_ATTRIBUTE_ALWAYS_INLINE. So when I attempt to have lldb evaluate an expression that implicitly instantiates a StringRef, I get 'error: Couldn't lookup symbols: __ZN4llvm9StringRefC1EPKc'.

As an example, most recently this happened to me when playing around with llvm::AttributeSet, having attached lldb to an opt built with -DCMAKE_BUILD_TYPE="Debug":

(lldb) e $AS.hasAttribute("myattr") error: Couldn't lookup symbols: __ZN4llvm9StringRefC1EPKc

Despite having built in a "Debug" configuration, LLVM_ATTRIBUTE_ALWAYS_INLINE makes it very difficult to debug LLVM.

How do you all deal with or work around this problem? Is there a good way to do so? If not, would anyone object if I sent up a patch to introduce a CMake variable or something to conditionally disable LLVM_ATTRIBUTE_ALWAYS_INLINE? I'd like to be able to turn it off, but I'm not sure if there's some good reason it needs to stay on even for debug builds?

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