[PATCH] D158901: [llvm-rc] Continue to use Argv[0] to resolve executable path

[Amy Huang via Phabricator via llvm-commits]

akhuang updated this revision to Diff 554020.
akhuang marked an inline comment as done.
akhuang added a comment.

Flip for loops and edit the comment


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D158901/new/

https://reviews.llvm.org/D158901

Files:
  llvm/tools/llvm-rc/llvm-rc.cpp


Index: llvm/tools/llvm-rc/llvm-rc.cpp
===================================================================
--- llvm/tools/llvm-rc/llvm-rc.cpp
+++ llvm/tools/llvm-rc/llvm-rc.cpp
@@ -130,20 +130,24 @@
   if (MainExecPath.empty())
     MainExecPath = Argv0;
 
-  StringRef Parent = llvm::sys::path::parent_path(MainExecPath);
   ErrorOr<std::string> Path = std::error_code();
   std::string TargetClang = (Triple + "-clang").str();
   std::string VersionedClang = ("clang-" + Twine(LLVM_VERSION_MAJOR)).str();
-  if (!Parent.empty()) {
-    // First look for the tool with all potential names in the specific
-    // directory of Argv0, if known
-    for (const auto *Name :
-         {TargetClang.c_str(), VersionedClang.c_str(), "clang", "clang-cl"}) {
+  for (const auto *Name :
+       {TargetClang.c_str(), VersionedClang.c_str(), "clang", "clang-cl"}) {
+    for (const StringRef Parent :
+         {llvm::sys::path::parent_path(MainExecPath),
+          llvm::sys::path::parent_path(Argv0)}) {
+      // Look for various versions of "clang" first in the MainExecPath parent
+      // directory and then in the argv[0] parent directory.
+      // On Windows (but not Unix) argv[0] is overwritten with the eqiuvalent
+      // of MainExecPath by InitLLVM.
       Path = sys::findProgramByName(Name, Parent);
       if (Path)
         return Path;
     }
   }
+
   // If no parent directory known, or not found there, look everywhere in PATH
   for (const auto *Name : {"clang", "clang-cl"}) {
     Path = sys::findProgramByName(Name);


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