Index: MinGW/Options.td
===================================================================
--- MinGW/Options.td
+++ MinGW/Options.td
@@ -21,8 +21,7 @@
 def Bdynamic: F<"Bdynamic">, HelpText<"Link against shared libraries">;
 def Bstatic: F<"Bstatic">, HelpText<"Do not link against shared libraries">;
 def dynamicbase: F<"dynamicbase">, HelpText<"Enable ASLR">;
-def entry: S<"entry">, MetaVarName<"<entry>">,
-  HelpText<"Name of entry point symbol">;
+defm entry: Eq<"entry", "Name of entry point symbol">, MetaVarName<"<entry>">;
 def exclude_all_symbols: F<"exclude-all-symbols">,
     HelpText<"Don't automatically export any symbols">;
 def export_all_symbols: F<"export-all-symbols">,
@@ -55,8 +54,8 @@
 def no_gc_sections: F<"no-gc-sections">, HelpText<"Don't remove unused sections">;
 def o: JoinedOrSeparate<["-"], "o">, MetaVarName<"<path>">,
   HelpText<"Path to file to write output">;
-defm out_implib: EqLong<"out-implib", "Import library name">;
-def output_def: S<"output-def">, HelpText<"Output def file">;
+defm out_implib: Eq<"out-implib", "Import library name">;
+defm output_def: Eq<"output-def", "Output def file">;
 def shared: F<"shared">, HelpText<"Build a shared object">;
 defm subs: Eq<"subsystem", "Specify subsystem">;
 def stack: S<"stack">;
@@ -87,7 +86,7 @@
 def alias_entry_e: JoinedOrSeparate<["-"], "e">, Alias<entry>;
 def alias_strip_s: Flag<["-"], "s">, Alias<strip_all>;
 def alias_strip_S: Flag<["-"], "S">, Alias<strip_debug>;
-def alias_undefined_u: S<"u">, Alias<undefined>;
+def alias_undefined_u: JoinedOrSeparate<["-"], "u">, Alias<undefined>;
 
 // Ignored options
 def: Joined<["-"], "O">;
Index: test/MinGW/driver.test
===================================================================
--- test/MinGW/driver.test
+++ test/MinGW/driver.test
@@ -42,14 +42,16 @@
 
 RUN: ld.lld -### foo.o -m i386pep --out-implib bar | FileCheck -check-prefix=IMPLIB %s
 RUN: ld.lld -### foo.o -m i386pep --out-implib=bar | FileCheck -check-prefix=IMPLIB %s
+RUN: ld.lld -### foo.o -m i386pep -out-implib bar | FileCheck -check-prefix=IMPLIB %s
+RUN: ld.lld -### foo.o -m i386pep -out-implib=bar | FileCheck -check-prefix=IMPLIB %s
 IMPLIB: -implib:bar
 
-RUN: ld.lld -### foo.o -m i386pep -out-implib bar | FileCheck -check-prefix=NOIMPLIB %s
-NOIMPLIB: -out:ut-implib
-
 RUN: ld.lld -### foo.o -m i386pep -e bar | FileCheck -check-prefix=ENTRY %s
+RUN: ld.lld -### foo.o -m i386pep -ebar | FileCheck -check-prefix=ENTRY %s
 RUN: ld.lld -### foo.o -m i386pep -entry bar | FileCheck -check-prefix=ENTRY %s
 RUN: ld.lld -### foo.o -m i386pep --entry bar | FileCheck -check-prefix=ENTRY %s
+RUN: ld.lld -### foo.o -m i386pep -entry=bar | FileCheck -check-prefix=ENTRY %s
+RUN: ld.lld -### foo.o -m i386pep --entry=bar | FileCheck -check-prefix=ENTRY %s
 ENTRY: -entry:bar
 
 RUN: ld.lld -### foo.o -m i386pep -mllvm bar -mllvm baz | FileCheck -check-prefix=MLLVM %s
@@ -94,12 +96,17 @@
 MINGW-FLAG: -lldmingw
 
 RUN: ld.lld -### -m i386pep foo.o --exclude-all-symbols | FileCheck -check-prefix EXCLUDE-ALL %s
+RUN: ld.lld -### -m i386pep foo.o -exclude-all-symbols | FileCheck -check-prefix EXCLUDE-ALL %s
 EXCLUDE-ALL: -exclude-all-symbols
 
 RUN: ld.lld -### -m i386pep foo.o --export-all-symbols | FileCheck -check-prefix EXPORT-ALL %s
+RUN: ld.lld -### -m i386pep foo.o -export-all-symbols | FileCheck -check-prefix EXPORT-ALL %s
 EXPORT-ALL: -export-all-symbols
 
 RUN: ld.lld -### -m i386pep foo.o --output-def out.def | FileCheck -check-prefix OUTPUT-DEF %s
+RUN: ld.lld -### -m i386pep foo.o --output-def=out.def | FileCheck -check-prefix OUTPUT-DEF %s
+RUN: ld.lld -### -m i386pep foo.o -output-def out.def | FileCheck -check-prefix OUTPUT-DEF %s
+RUN: ld.lld -### -m i386pep foo.o -output-def=out.def | FileCheck -check-prefix OUTPUT-DEF %s
 OUTPUT-DEF: -output-def:out.def
 
 RUN: ld.lld -### -m i386pep foo.o -Xlink=-lldmap | FileCheck -check-prefix XLINK %s
@@ -176,8 +183,8 @@
 RUN: ld.lld -### foo.o -m i386pe -require-defined _foo --require-defined _bar -require-defined=_baz --require-defined=_foo2 | FileCheck -check-prefix=REQUIRE-DEFINED %s
 REQUIRE-DEFINED: -include:_foo -include:_bar -include:_baz -include:_foo2
 
-RUN: ld.lld -### foo.o -m i386pe -u _foo --undefined _bar -undefined=_baz --undefined=_foo2 | FileCheck -check-prefix=UNDEFINED %s
-UNDEFINED: -includeoptional:_foo -includeoptional:_bar -includeoptional:_baz -includeoptional:_foo2
+RUN: ld.lld -### foo.o -m i386pe -u _foo --undefined _bar -undefined=_baz --undefined=_foo2 -u_foo3 | FileCheck -check-prefix=UNDEFINED %s
+UNDEFINED: -includeoptional:_foo -includeoptional:_bar -includeoptional:_baz -includeoptional:_foo2 -includeoptional:_foo3
 
 RUN: ld.lld -### -m i386pep foo.o -Llibpath | FileCheck -check-prefix LIBPATH %s
 LIBPATH: -libpath:libpath