[cfe-dev] ARM Linux libc++ / libunwind — Exceptions not being caught

[Louis Dionne via cfe-dev]

Are you building your test program with -fno-rtti? I’ve seen a problem where if libc++ is built with RTTI and exceptions enabled, and a program is built with exceptions enabled BUT -fno-rtti, exceptions thrown from the program will not be caught.

Louis

> On Aug 25, 2018, at 15:20, Andrew Brownsword via cfe-dev <cfe-dev at lists.llvm.org> wrote:
> 
> I have built the llvm/clang 7.0.0 rc2, including libc++/libc++abi/libunwind for my Ubuntu 16.04 Linux 32-bit ARM7 hf target.  A trivial c++17 test program with just this try/catch block:
> 
> try { auto result = stoul(“foo”); } catch (...) { std::cerr << “caught!” << std::endl; }
> 
> fails to print “caught!”  Instead it just aborts.  If no exceptions are thrown,  programs built with this toolchain behave as expected.
> 
> I have tried numerous variations of the toolchain, compile and link steps (including alternatives to the cxxabi), however they all run into various errors or ultimately give the same runtime abort.
> 
> Any suggestions for how to get a functioning Linux armhf clang/libc++ 7.0.0 toolchain?
> 
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