[LLD] [MinGW] Handle --large-address-aware

[mstorsjo]

Summary

In GNU ld, this option is only available on i386, not on x86_64 (where it's enabled by default with no option to disable it either).

[rnk]

lgtm

[ruiu]

LGTM

lld/trunk/MinGW/Driver.cpp

bool mingw::link(ArrayRef<const char *> ArgsArr, raw_ostream &Diag) {
   if (Args.hasArg(OPT_shared))
     Add("-dll");
   if (Args.hasArg(OPT_verbose))
     Add("-verbose");
   if (Args.hasArg(OPT_export_all_symbols))
     Add("-export-all-symbols");
   if (!Args.hasArg(OPT_strip_all))
     Add("-debug:dwarf");
+  if (Args.hasArg(OPT_large_address_aware))
+    Add("-largeaddressaware");
 
   if (auto *A = Args.getLastArg(OPT_m)) {
     StringRef S = A->getValue();
     if (S == "i386pe")
       Add("-machine:x86");
     else if (S == "i386pep")
       Add("-machine:x64");
     else if (S == "thumb2pe")

lld/trunk/MinGW/Options.td

def entry: S<"entry">, MetaVarName<"<entry>">,
   HelpText<"Name of entry point symbol">;
 def export_all_symbols: F<"export-all-symbols">,
     HelpText<"Export all symbols even if a def file or dllexport attributes are used">;
 def l: JoinedOrSeparate<["-"], "l">, MetaVarName<"<libName>">,
   HelpText<"Root name of library to use">;
 def m: JoinedOrSeparate<["-"], "m">, HelpText<"Set target emulation">;
 def no_whole_archive: F<"no-whole-archive">,
     HelpText<"No longer include all object files for following archives">;
+def large_address_aware: Flag<["--"], "large-address-aware">,
+    HelpText<"Enable large addresses">;
 def o: JoinedOrSeparate<["-"], "o">, MetaVarName<"<path>">,
   HelpText<"Path to file to write output">;
 def out_implib: Separate<["--"], "out-implib">, HelpText<"Import library name">;
 def out_implib_eq: Joined<["--"], "out-implib=">, Alias<out_implib>;
 def output_def: S<"output-def">, HelpText<"Output def file">;
 def shared: F<"shared">, HelpText<"Build a shared object">;
 def subs: S<"subsystem">, HelpText<"Specify subsystem">;
 def stack: S<"stack">;

lld/trunk/test/MinGW/driver.test

 XLINK: -lldmap
 
 RUN: ld.lld -### -m i386pep foo.o | FileCheck -check-prefix DEBUG %s
 DEBUG: -debug:dwarf
 
 RUN: ld.lld -### -m i386pep foo.o -s | FileCheck -check-prefix STRIP %s
 RUN: ld.lld -### -m i386pep foo.o --strip-all | FileCheck -check-prefix STRIP %s
 STRIP-NOT: -debug:dwarf
+
+RUN: ld.lld -### -m i386pep foo.o --large-address-aware | FileCheck -check-prefix LARGE-ADDRESS-AWARE %s
+LARGE-ADDRESS-AWARE: -largeaddressaware