[llvm] 282744a - [llvm-rc] Look for "clang-<major>" when locating a suitable preprocessor

[Martin Storsjö via llvm-commits]

Author: Martin Storsjö
Date: 2023-03-28T11:02:42+03:00
New Revision: 282744a9ce18120dc0a6eceb02693b36980d9498

URL: https://github.com/llvm/llvm-project/commit/282744a9ce18120dc0a6eceb02693b36980d9498
DIFF: https://github.com/llvm/llvm-project/commit/282744a9ce18120dc0a6eceb02693b36980d9498.diff

LOG: [llvm-rc] Look for "clang-<major>" when locating a suitable preprocessor

In some cases, there's no adjacent executable named "clang" or
"clang-cl", but one name "clang-<major>". This logic doesn't
cover every possible deployment setup of course, but should
cover more fairly common/reasonable cases.

See
https://github.com/curl/curl-for-win/commit/caaae171ac43af5b883403714dafd42030d8de61#commitcomment-105808524
for discussion about a case where this would have been helpful.

Differential Revision: https://reviews.llvm.org/D146794

Added: 
    

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

Removed: 
    


################################################################################
diff  --git a/llvm/tools/llvm-rc/llvm-rc.cpp b/llvm/tools/llvm-rc/llvm-rc.cpp
index 036178b25ed96..8f84ae6130479 100644
--- a/llvm/tools/llvm-rc/llvm-rc.cpp
+++ b/llvm/tools/llvm-rc/llvm-rc.cpp
@@ -17,6 +17,7 @@
 #include "ResourceScriptStmt.h"
 #include "ResourceScriptToken.h"
 
+#include "llvm/Config/llvm-config.h"
 #include "llvm/Object/WindowsResource.h"
 #include "llvm/Option/Arg.h"
 #include "llvm/Option/ArgList.h"
@@ -138,10 +139,12 @@ ErrorOr<std::string> findClang(const char *Argv0, StringRef Triple) {
   StringRef Parent = llvm::sys::path::parent_path(Argv0);
   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(), "clang", "clang-cl"}) {
+    for (const auto *Name :
+         {TargetClang.c_str(), VersionedClang.c_str(), "clang", "clang-cl"}) {
       Path = sys::findProgramByName(Name, Parent);
       if (Path)
         return Path;