RUN: yaml2obj %S/Inputs/macho.yaml -o %t-macho.o
RUN: yaml2obj %S/Inputs/coff.yaml -o %t-coff.o

RUN: rm -f %t.ar
RUN: llvm-ar crs %t.ar %t-macho.o
RUN: grep -q __.SYMDEF %t.ar
RUN: llvm-ar crs %t.ar %t-coff.o
RUN: grep -q __.SYMDEF %t.ar

RUN: rm -f %t.ar
RUN: llvm-ar crs %t.ar %t-coff.o
RUN: not grep -q __.SYMDEF %t.ar
RUN: llvm-ar crs %t.ar %t-macho.o
RUN: not grep -q __.SYMDEF %t.ar

Ensure that we select the existing format when updating.