dmd/ldc failed with exit code -11

[Anonymouse]

I have a large named enum (currently 645 members) of IRC event 
types. It's big by neccessity[1].

I'm using dub, and both dmd and ldc successfully build it in test 
and debug modes, but choke and die on plain and release. I 
bisected it down to when I did a big addition to the enum to 
encompass virtually all event types there are.

dmd -v:
[...]
> code      common
> function  kameloso.common.Separator.__xopEquals
> function  kameloso.common.Separator.__xtoHash
> function  kameloso.common.Settings.__xopEquals
> function  kameloso.common.Settings.__xtoHash
> function  kameloso.common.scopeguard
> function  kameloso.common.scopeguard.scopeString
> function  kameloso.common.scopeguard.entryString
> function  kameloso.common.KamelosoLogger.this
> function  kameloso.common.KamelosoLogger.writeLogMsg
> function  kameloso.common.KamelosoLogger.beginLogMsg
> function  kameloso.common.KamelosoLogger.logMsgPart
> function  kameloso.common.KamelosoLogger.finishLogMsg
> zsh: segmentation fault (core dumped)  dmd -c -v  -w -d 
> -version=Have_kameloso -Isource/  source/arsd/dom.d
Where it stops here varies if I comment stuff out, so I don't 
think the Logger is at fault.

ldc -v:
[...]
> code      irc
> code      constants
> code      connection
> code      config
> code      common
> /usr/lib/libLLVM-5.0.so(_ZN4llvm3sys15PrintStackTraceERNS_11raw_ostreamE+0x2b)[0x7f09953839bb]
> /usr/lib/libLLVM-5.0.so(_ZN4llvm3sys17RunSignalHandlersEv+0x56)[0x7f0995381806]
> /usr/lib/libLLVM-5.0.so(+0x808953)[0x7f0995381953]
> /usr/lib/libpthread.so.0(+0x11da0)[0x7f099496cda0]
> ldc(_ZN16TemplateInstance12needsCodegenEv+0x8)[0x561fe42fc128]
> ldc(_ZN16TemplateInstance12needsCodegenEv+0x103)[0x561fe42fc223]
> ldc(_ZN16TemplateInstance12needsCodegenEv+0x103)[0x561fe42fc223]
> ldc(_ZN16TemplateInstance12needsCodegenEv+0x103)[0x561fe42fc223]
> ldc(_ZN16TemplateInstance12needsCodegenEv+0x103)[0x561fe42fc223]
> ldc(_ZN16TemplateInstance12needsCodegenEv+0x103)[0x561fe42fc223]
> ldc(_ZN16TemplateInstance12needsCodegenEv+0x103)[0x561fe42fc223]
[...]
> zsh: segmentation fault (core dumped)  ldc -v  -w -d -oq 
> -od=.dub/obj -d-version=Have_kameloso -Isource/

What can I do? Merely copying the enum into a test file and 
compiling with an empty main does nothing, it doesn't seem to be 
enough to replicate the bug.

(Arch/Manjaro 64-bit, dmd 2.077.0, ldc 1.5.0 based on 2.075.1)

[1] http://defs.ircdocs.horse/defs/numerics.html