clang-cl: Don't look up absolute paths in %LIB%.

Before this patch, passing a non-existent absolute path to clang-cl would cause
stat'ing of impossible paths. For example, `clang-cl -c d:\adsfasdf.txt` would
cause a stat of
C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\LIBd:\asdfadsf.cc

llvm-svn: 235787

diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 07a5e42..7e52b1f 100644 (file)
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -989,7 +989,8 @@ static bool DiagnoseInputExistence(const Driver &D, const DerivedArgList &Args,
   if (llvm::sys::fs::exists(Twine(Path)))
     return true;
 
-  if (D.IsCLMode() && llvm::sys::Process::FindInEnvPath("LIB", Value))
+  if (D.IsCLMode() && !llvm::sys::path::is_absolute(Twine(Path)) &&
+      llvm::sys::Process::FindInEnvPath("LIB", Value))
     return true;
 
   D.Diag(clang::diag::err_drv_no_such_file) << Path;

diff --git a/clang/test/Driver/cl-inputs.c b/clang/test/Driver/cl-inputs.c
index b0265df..6320009 100644 (file)
--- a/clang/test/Driver/cl-inputs.c
+++ b/clang/test/Driver/cl-inputs.c
@@ -59,4 +59,9 @@
 // LIBINPUT2: link.exe"
 // LIBINPUT2-NOT: "cl-test2.lib"
 
+// RUN: %clang_cl -### -- %s /nonexisting.lib 2>&1 | FileCheck -check-prefix=LIBINPUT3 %s
+// LIBINPUT3: error: no such file or directory: '/nonexisting.lib'
+// LIBINPUT3: link.exe"
+// LIBINPUT3-NOT: "/nonexisting.lib"
+
 void f();