[LLD] [MinGW] Implement the --lto-emit-asm and -plugin-opt=emit-llvm options (#81475)

These were implemented in the COFF linker in
3923e61 and
d12b99a.

This matches the corresponding options in the ELF linker.

Author: mstorsjo

lld/MinGW/Driver.cpp

@@ -451,6 +451,10 @@ bool link(ArrayRef<const char *> argsArr, llvm::raw_ostream &stdoutOS,
     add("-lto-cs-profile-generate");
   if (auto *arg = args.getLastArg(OPT_lto_cs_profile_file))
     add("-lto-cs-profile-file:" + StringRef(arg->getValue()));
+  if (args.hasArg(OPT_plugin_opt_emit_llvm))
+    add("-lldemit:llvm");
+  if (args.hasArg(OPT_lto_emit_asm))
+    add("-lldemit:asm");
 
   if (auto *a = args.getLastArg(OPT_thinlto_cache_dir))
     add("-lldltocache:" + StringRef(a->getValue()));

lld/MinGW/Options.td

@@ -158,6 +158,8 @@ def lto_cs_profile_generate: FF<"lto-cs-profile-generate">,
   HelpText<"Perform context sensitive PGO instrumentation">;
 def lto_cs_profile_file: JJ<"lto-cs-profile-file=">,
   HelpText<"Context sensitive profile file path">;
+def lto_emit_asm: FF<"lto-emit-asm">,
+  HelpText<"Emit assembly code">;
 
 def thinlto_cache_dir: JJ<"thinlto-cache-dir=">,
   HelpText<"Path to ThinLTO cached object file directory">;
@@ -181,6 +183,9 @@ def: J<"plugin-opt=cs-profile-path=">,
   Alias<lto_cs_profile_file>, HelpText<"Alias for --lto-cs-profile-file">;
 def plugin_opt_dwo_dir_eq: J<"plugin-opt=dwo_dir=">,
   HelpText<"Directory to store .dwo files when LTO and debug fission are used">;
+def plugin_opt_emit_asm: F<"plugin-opt=emit-asm">,
+  Alias<lto_emit_asm>, HelpText<"Alias for --lto-emit-asm">;
+def plugin_opt_emit_llvm: F<"plugin-opt=emit-llvm">;
 def: J<"plugin-opt=jobs=">, Alias<thinlto_jobs_eq>, HelpText<"Alias for --thinlto-jobs=">;
 def plugin_opt_mcpu_eq: J<"plugin-opt=mcpu=">;
 

lld/test/MinGW/driver.test

@@ -415,6 +415,13 @@ LTO_OPTS: -mllvm:-mcpu=x86-64 -opt:lldlto=2 -dwodir:foo -lto-cs-profile-generate
 RUN: ld.lld -### foo.o -m i386pep --lto-O2 --lto-CGO1 --lto-cs-profile-generate --lto-cs-profile-file=foo 2>&1 | FileCheck -check-prefix=LTO_OPTS2 %s
 LTO_OPTS2:-opt:lldlto=2 -opt:lldltocgo=1 -lto-cs-profile-generate -lto-cs-profile-file:foo
 
+RUN: ld.lld -### foo.o -m i386pe -plugin-opt=emit-asm 2>&1 | FileCheck -check-prefix=LTO_EMIT_ASM %s
+RUN: ld.lld -### foo.o -m i386pe --lto-emit-asm 2>&1 | FileCheck -check-prefix=LTO_EMIT_ASM %s
+LTO_EMIT_ASM: -lldemit:asm
+
+RUN: ld.lld -### foo.o -m i386pe -plugin-opt=emit-llvm 2>&1 | FileCheck -check-prefix=LTO_EMIT_LLVM %s
+LTO_EMIT_LLVM: -lldemit:llvm
+
 Test GCC specific LTO options that GCC passes unconditionally, that we ignore.
 
 RUN: ld.lld -### foo.o -m i386pep -plugin /usr/lib/gcc/x86_64-w64-mingw32/10-posix/liblto_plugin.so -plugin-opt=/usr/lib/gcc/x86_64-w64-mingw32/10-posix/lto-wrapper -plugin-opt=-fresolution=/tmp/ccM9d4fP.res -plugin-opt=-pass-through=-lmingw32 2> /dev/null