3 files changed, 23 insertions, 1 deletions
diff --git a/llvm/test/tools/llvm-ar/Inputs/absolute-paths.lib b/llvm/test/tools/llvm-ar/Inputs/absolute-paths.lib
new file mode 100644
index 00000000000..e69de29bb2d
--- /dev/null
+++ b/llvm/test/tools/llvm-ar/Inputs/absolute-paths.lib
diff --git a/llvm/test/tools/llvm-ar/absolute-paths.test b/llvm/test/tools/llvm-ar/absolute-paths.test
new file mode 100644
index 00000000000..0b42d7d2dcb
--- /dev/null
+++ b/llvm/test/tools/llvm-ar/absolute-paths.test
@@ -0,0 +1,20 @@
+MSVC's lib.exe produces archives with absolute paths to the members. It's useful
+for llvm-ar to extract them to their basename in the CWD, since usually the
+directories in the path in the archive won't exist during archive extraction.
+
+Get a temp clean cwd to extract into.
+RUN: rm -rf %t && mkdir %t && cd %t
+
+RUN: llvm-ar t %S/Inputs/absolute-paths.lib | FileCheck %s --check-prefix=CHECK-LIST
+CHECK-LIST: C:/src/llvm-project/build/dne/b.o
+CHECK-LIST: C:/src/llvm-project/build/dne/a.o
+
+Check that a.o comes out and defines foo.
+RUN: llvm-ar x %S/Inputs/absolute-paths.lib 'C:/src/llvm-project/build/dne/a.o'
+RUN: llvm-nm a.o | FileCheck %s --check-prefix=CHECK-A
+CHECK-A: T foo
+
+Check that b.o comes out and defines bar.
+RUN: llvm-ar x %S/Inputs/absolute-paths.lib C:/src/llvm-project/build/dne/b.o
+RUN: llvm-nm b.o | FileCheck %s --check-prefix=CHECK-B
+CHECK-B: T bar
diff --git a/llvm/tools/llvm-ar/llvm-ar.cpp b/llvm/tools/llvm-ar/llvm-ar.cpp
index 6d7c1c1c546..17e78a6bf96 100644
--- a/llvm/tools/llvm-ar/llvm-ar.cpp
+++ b/llvm/tools/llvm-ar/llvm-ar.cpp
@@ -377,7 +377,9 @@ static void doExtract(StringRef Name, const object::Archive::Child &C) {
   sys::fs::perms Mode = ModeOrErr.get();
 
   int FD;
-  failIfError(sys::fs::openFileForWrite(Name, FD, sys::fs::F_None, Mode), Name);
+  failIfError(sys::fs::openFileForWrite(sys::path::filename(Name), FD,
+                                        sys::fs::F_None, Mode),
+              Name);
 
   {
     raw_fd_ostream file(FD, false);