[LLVMdev] debugging llvm from clang using gdb

[Tim Northover]

Hi Reed,

> I can put a breakpoint but it never stops when I say "run ...."

This is usually because clang forks off a process to do the actual
work. Try executing "set follow-fork-mode child" in gdb before running
clang.

I vaguely remember that running gdb against the "clang -cc1" command
works too (sometimes), but it's so rare that something is only
clang-debuggable that I've forgotten the details.

Cheers.

Tim.