UPDATE:
* b Loader.d:123 didn't help either:
error: parsing line table prologue at 0x00000000 (parsing ended around 0x00000000
Breakpoint 1: where = mybinary.temp`D4gtkc6Loader6Linker12_staticDtor3FZv, address = 0x0000000100315410
(process exited despite breakpoint); dmd's dwarf debug info seems incorrect
* b _d_throwc #does nothing
* b _d_print_throwable: doesn't show useful context (only shows backtrace after stack unwinding)
(lldb) bt
* thread #1: tid = 0x6187c1, 0x0000000100191c30 mybinary.temp _d_print_throwable, stop reason = breakpoint 4.1
* frame #0: 0x0000000100191c30 mybinary.temp _d_print_throwable
frame #1: 0x0000000100191530 mybinary.temp rt_init + 160
frame #2: 0x0000000100191a9a mybinary.temp D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZv + 14
frame #3: 0x0000000100191a40 mybinary.temp D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ7tryExecMFMDFZvZv + 36
frame #4: 0x00000001001919a6 mybinary.temp _d_run_main + 498
frame #5: 0x0000000100001efa mybinary.temp main + 34
frame #6: 0x00007fff89ad65ad libdyld.dylib start + 1
* b _D4gtkc6Loader6Linker11loadLibraryFAyaZv isn't very helpful since this function is complex (and could be inlined more generally) and that function is called many times before the exception is thrown
```
public static void loadLibrary(string library)
{
void* handle = pLoadLibrary(library);
//TODO: A more general way to try more than one version.
if ( handle is null && library == importLibs[LIBRARY.GSV] )
handle = pLoadLibrary(importLibs[LIBRARY.GSV1]);
if ( handle is null )
throw new Exception("Library load failed: " ~ library);
loadedLibraries[library] = handle;
}
```
but at least we get a better context:
(lldb) bt
* thread #1: tid = 0x6187c1, 0x0000000100315878 mybinary.temp D4gtkc6Loader6Linker11loadLibraryFAyaZv, stop reason = breakpoint 3.1
* frame #0: 0x0000000100315878 mybinary.temp D4gtkc6Loader6Linker11loadLibraryFAyaZv
frame #1: 0x0000000100315699 mybinary.temp D4gtkc6Loader6Linker9getSymbolFAyaAAyaXPv + 237
frame #2: 0x00000001003155a4 mybinary.temp D4gtkc6Loader6Linker9getSymbolFAyaAE4gtkc5paths7LIBRARYXPv + 232
frame #3: 0x00000001003163bd mybinary.temp D4gtkc6Loader6Linker39__T4linkTPUZE4gtkc12gobjecttypes5GTypeZ4linkFKPUZE4gtkc12gobjecttypes5GTypeAyaAE4gtkc5paths7LIBRARYXv + 69 at .dub/packages/gtk-d-3.3.1/gtk-d/src/gtkc/Loader.d:46
frame #4: 0x000000010038c75d mybinary.temp D4gtkc3atk18_sharedStaticCtor4FZv + 77 at .dub/packages/gtk-d-3.3.1/gtk-d/src/gtkc/atk.d:36
frame #5: 0x000000010038c67d mybinary.temp _D4gtkc3atk15__modsharedctorFZv + 9 at .dub/packages/gtk-d-3.3.1/gtk-d/src/gtkc/atk.d:32
frame #6: 0x0000000100199c17 mybinary.temp D2rt5minfo67__T14runModuleFuncsS442rt5minfo11ModuleGroup8runCtorsMFZ9__lambda2Z14runModuleFuncsMFAxPyS6object10ModuleInfoZv + 91
frame #7: 0x0000000100199785 mybinary.temp D2rt5minfo11ModuleGroup8runCtorsMFZv + 37
frame #8: 0x0000000100199a91 mybinary.temp D2rt5minfo13rt_moduleCtorUZ14__foreachbody1MFKS2rt19sections_osx_x86_6412SectionGroupZi + 45
frame #9: 0x0000000100199a60 mybinary.temp rt_moduleCtor + 20
frame #10: 0x00000001001914f3 mybinary.temp rt_init + 99
frame #11: 0x0000000100191a9a mybinary.temp D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZv + 14
frame #12: 0x0000000100191a40 mybinary.temp D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ7tryExecMFMDFZvZv + 36
frame #13: 0x00000001001919a6 mybinary.temp _d_run_main + 498
frame #14: 0x0000000100001efa mybinary.temp main + 34
frame #15: 0x00007fff89ad65ad libdyld.dylib start + 1
Ideally there should be a way (via a runtime or compile time option) to wrap the exception throwing (during rt_moduleCtor) inside a extern(C) function that we can put a breakpoint on (and possibly even call backtrace_symbols on)