[llvm-dev] libfuzzer debugging

[Jonas Paulsson via llvm-dev]

Hi,

I am trying to debug http://lab.llvm.org:8011/#/builders/8 which is a 
stage-2 failure with libfuzzer (minimize_two_crashes.test). A bisect has 
shown that this is a problem that begun with 669ddd1 "Turn on the new 
pass manager by default".

The test itself is small and the stage1 and stage2 functions are 
identical. So it must be somewhere in libfuzzer itself that something is 
going wrong.

My problem is that I cannot get a good GDB experience with the stage2 
build. I have built an entire stage-2 build in Debug mode, but I am 
having severe trouble reading most variables, which works fine with the 
stage-1 (gcc) build.

I would appreciate any help... Is there anything more than 
"-DCMAKE_BUILD_TYPE=Debug" I need to use for some reason with a stage-2 
(clang) build?

thanks,

Jonas