[lldb-dev] Stopping "stop reason = exec"

[Chris Lattner via lldb-dev]

> On Dec 4, 2017, at 4:25 PM, Chris Lattner <sabre at nondot.org> wrote:
>> For macOS, you can also just do:
>> 
>> (lldb) break set -n _dyld_start --skip-prologue 0 -s dyld
>> Breakpoint 2: where = dyld`_dyld_start, address = 0x000000010000b19c
>> (lldb) b com add -o continue
>> either in your .lldbinit or in your debug session.  
> 
> This doesn’t appear to work, I tried both lldb and in a debug session.  I’m starting lldb with “lldb -- swiftc … “ if that matters.
> 
> (lldb) break set -n _dyld_start --skip-prologue 0 -s dyld
> Breakpoint 1: where = dyld`_dyld_start, address = 0x0000000000001000
> (lldb) b com add -o continue
> Breakpoint 2: no locations (pending).
> WARNING:  Unable to resolve breakpoint to any actual locations.

I realize that this is probably because you’re not using the standard ‘b’ alias.  When I use ‘br’, the command succeeds, but I still stop on launch:

(lldb) br com add -o continue
(lldb) r
There is a running process, kill it and restart?: [Y/n] y
Process 24049 exited with status = 9 (0x00000009) 
Process 24054 launched: '/Users/clattner/Projects/build/Xcode-ReleaseAssert+swift-DebugAssert/swift-macosx-x86_64/Debug/bin/swiftc' (x86_64)
Process 24054 stopped
* thread #2, stop reason = exec
    frame #0: 0x0000000109852000 dyld`_dyld_start
dyld`_dyld_start:
->  0x109852000 <+0>: popq   %rdi
    0x109852001 <+1>: pushq  $0x0
    0x109852003 <+3>: movq   %rsp, %rbp
    0x109852006 <+6>: andq   $-0x10, %rsp
Target 0: (swiftc) stopped.


Thank you for the help, I appreciate it!

-Chris

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