[cfe-dev] LInk with/without LLVM_ENABLE_ABI_BREAKING_CHECKS

[Fangrui Song via cfe-dev]

On 2020-09-17, Andy via cfe-dev wrote:
>I want use clang sources in my project. Rrlease version is linked and
>running OK, but debug version need llvm/lib/Support/ABIBreak.cpp to link
>and has runtime errors. This errors I can avoid by modying
>HandleLLVMOptions.cmake by defining LLVM_ABI_BREAKING_CHECKS.
>I can link debug objects and run OK, but it is huge: link need about 14 GB
>memory and takes 3 minutes of time.
>It will be well - near all objects files compiled as release but some
>compiled as debug. This is main problem: after modyfuing cmake , release
>version need EnableABIBreakingChecks and has errors. How do mix world with
>enable check and disable check?

Hi Andy, mixing LLVM_ABI_BREAKING_CHECKS objects and non-LLVM_ABI_BREAKING_CHECKS objects is not supported.
Please check out https://llvm.org/docs/ProgrammersManual.html#abi-breaking-checks

More specifically, Error in LLVM_ABI_BREAKING_CHECKS mode has one
additional bit field. If you pass `Error` compiled without
LLVM_ABI_BREAKING_CHECKS (the bit is not set) to an object with
LLVM_ABI_BREAKING_CHECKS (which checks whether the bit is set), it will assuredly lead to failures.
Other frequently used types, e.g. ilist and DenseMap will have similar failures.