[PATCH] D59415: Do not resolve directory junctions for `-fdiagnostics-absolute-paths` on Windows.

[Igor Kudrin via Phabricator via cfe-commits]

ikudrin updated this revision to Diff 200252.
ikudrin added a comment.

- Made the patch affect only `-fdiagnostics-absolute-paths` option.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D59415/new/

https://reviews.llvm.org/D59415

Files:
  lib/Frontend/TextDiagnostic.cpp
  test/Frontend/absolute-paths-windows.test
  test/Frontend/lit.local.cfg


Index: test/Frontend/lit.local.cfg
===================================================================
--- test/Frontend/lit.local.cfg
+++ test/Frontend/lit.local.cfg
@@ -1 +1 @@
-config.suffixes = ['.c', '.cpp', '.m', '.mm', '.ll', '.cl']
+config.suffixes = ['.c', '.cpp', '.m', '.mm', '.ll', '.cl', '.test']
Index: test/Frontend/absolute-paths-windows.test
===================================================================
--- /dev/null
+++ test/Frontend/absolute-paths-windows.test
@@ -0,0 +1,9 @@
+// REQUIRES: system-windows
+// RUN: rm -rf %t.dir
+// RUN: mkdir -p %t.dir\real
+// RUN: cmd /c mklink /j %t.dir\junc %t.dir\real
+// RUN: echo "wrong code" > %t.dir\real\foo.cpp
+// RUN: not %clang_cc1 -fsyntax-only -fdiagnostics-absolute-paths %t.dir\junc\foo.cpp 2>&1 | FileCheck %s
+
+// CHECK-NOT: .dir\real\foo.cpp
+// CHECK: .dir\junc\foo.cpp
Index: lib/Frontend/TextDiagnostic.cpp
===================================================================
--- lib/Frontend/TextDiagnostic.cpp
+++ lib/Frontend/TextDiagnostic.cpp
@@ -765,7 +765,14 @@
     const DirectoryEntry *Dir = SM.getFileManager().getDirectory(
         llvm::sys::path::parent_path(Filename));
     if (Dir) {
+#ifdef _WIN32
+      SmallString<4096> DirName = Dir->getName();
+      llvm::sys::fs::make_absolute(DirName);
+      llvm::sys::path::native(DirName);
+      llvm::sys::path::remove_dots(DirName, /* remove_dot_dot */ true);
+#else
       StringRef DirName = SM.getFileManager().getCanonicalName(Dir);
+#endif
       llvm::sys::path::append(AbsoluteFilename, DirName,
                               llvm::sys::path::filename(Filename));
       Filename = StringRef(AbsoluteFilename.data(), AbsoluteFilename.size());


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