I use gdb on linux to debug the swift binary. I find that gdb takes about 20 
seconds just to read the symbols before I can even interact with gdb. I was 
wondering if anyone knew of a way to decrease the symbol load time, either by 
some gdb settings or by compiling swift/llvm/clang in such a way as to get a 
usefully debuggable binary but without so many symbols.

My swift binary is a massive 1.1gb.

$ ls -lh swift
-rwxr-xr-x 1 jon jon 1.1G Dec  8 18:43 swift*

I built all of llvm/clang/swift in Debug mode.

(Tangentially related, but using gold instead of ld to link swift is about 2-3x 
faster)
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