fix new arg parsing

Author: ZuseZ4

bootstrap.example.toml

@@ -106,6 +106,9 @@
 # Whether to build LLVM with support for it's gpu offload runtime.
 #llvm.offload = false
 
+# absolute path to ClangConfig.cmake
+#llvm.offload-clang-dir = ""
+
 # When true, link libstdc++ statically into the rustc_llvm.
 # This is useful if you don't want to use the dynamic version of that
 # library provided by LLVM.

src/bootstrap/configure.py

@@ -120,6 +120,7 @@ def v(*args):
 o("llvm-assertions", "llvm.assertions", "build LLVM with assertions")
 o("llvm-enzyme", "llvm.enzyme", "build LLVM with enzyme")
 o("llvm-offload", "llvm.offload", "build LLVM with gpu offload support")
+o("llvm-offload-clang-dir", "llvm.offload-clang-dir", "pass the absolute directory of ClangConfig.cmake")
 o("llvm-plugins", "llvm.plugins", "build LLVM with plugin interface")
 o("debug-assertions", "rust.debug-assertions", "build with debugging assertions")
 o(