[ELF] Handle GCC collect2 -plugin-opt= on Windows

Follows up on commit cd5d5ce by
additionally ignoring relative paths ending in "lto-wrapper.exe" as
can be the case for GCC cross-compiled for Windows.

Reviewed By: tejohnson

Differential Revision: https://reviews.llvm.org/D138065

(cherry picked from commit cf4f35b)

Author: bwerl

lld/ELF/Driver.cpp

@@ -1330,12 +1330,15 @@ static void readConfigs(opt::InputArgList &args) {
     parseClangOption(std::string("-") + arg->getValue(), arg->getSpelling());
 
   // GCC collect2 passes -plugin-opt=path/to/lto-wrapper with an absolute or
-  // relative path. Just ignore. If not ended with "lto-wrapper", consider it an
+  // relative path. Just ignore. If not ended with "lto-wrapper" (or
+  // "lto-wrapper.exe" for GCC cross-compiled for Windows), consider it an
   // unsupported LLVMgold.so option and error.
-  for (opt::Arg *arg : args.filtered(OPT_plugin_opt_eq))
-    if (!StringRef(arg->getValue()).endswith("lto-wrapper"))
+  for (opt::Arg *arg : args.filtered(OPT_plugin_opt_eq)) {
+    StringRef v(arg->getValue());
+    if (!v.endswith("lto-wrapper") && !v.endswith("lto-wrapper.exe"))
       error(arg->getSpelling() + ": unknown plugin option '" + arg->getValue() +
             "'");
+  }
 
   config->passPlugins = args::getStrings(args, OPT_load_pass_plugins);
 

lld/test/ELF/lto-plugin-ignore.s

@@ -8,7 +8,9 @@
 # RUN: ld.lld %t.o -o /dev/null \
 # RUN:   -plugin path/to/liblto_plugin.so \
 # RUN:   -plugin-opt=/path/to/lto-wrapper \
+# RUN:   -plugin-opt=/path/to/lto-wrapper.exe \
 # RUN:   -plugin-opt=relative/path/to/lto-wrapper \
+# RUN:   -plugin-opt=relative/path/to/lto-wrapper.exe \
 # RUN:   -plugin-opt=-fresolution=zed \
 # RUN:   -plugin-opt=-pass-through=-lgcc \
 # RUN:   -plugin-opt=-pass-through=-lgcc_eh \