[clang] 3625d2d - [clang] Use VFS to get CWD in `-cc1as` (#173289)

[via cfe-commits]

Author: Jan Svoboda
Date: 2026-01-05T10:54:07-08:00
New Revision: 3625d2d51575f984803e44b04e2ddf6f5d1fd21d

URL: https://github.com/llvm/llvm-project/commit/3625d2d51575f984803e44b04e2ddf6f5d1fd21d
DIFF: https://github.com/llvm/llvm-project/commit/3625d2d51575f984803e44b04e2ddf6f5d1fd21d.diff

LOG: [clang] Use VFS to get CWD in `-cc1as` (#173289)

This PR uses the VFS to get the current working directory in `-cc1as`
invocations, preventing sandbox violations.

Added: 
    

Modified: 
    clang/tools/driver/cc1as_main.cpp

Removed: 
    


################################################################################
diff  --git a/clang/tools/driver/cc1as_main.cpp b/clang/tools/driver/cc1as_main.cpp
index dfff194f83106..cb41ffc60d132 100644
--- a/clang/tools/driver/cc1as_main.cpp
+++ b/clang/tools/driver/cc1as_main.cpp
@@ -520,9 +520,8 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
     Ctx.setCompilationDir(Opts.DebugCompilationDir);
   else {
     // If no compilation dir is set, try to use the current directory.
-    SmallString<128> CWD;
-    if (!sys::fs::current_path(CWD))
-      Ctx.setCompilationDir(CWD);
+    if (auto CWD = VFS->getCurrentWorkingDirectory())
+      Ctx.setCompilationDir(*CWD);
   }
   if (!Opts.DebugPrefixMap.empty())
     for (const auto &KV : Opts.DebugPrefixMap)