[PATCH] D27298: [Frontend] Fix an issue where a quoted search path is incorrectly removed as a duplicate header search path

[Alex Lorenz via Phabricator via cfe-commits]

arphaman created this revision.
arphaman added reviewers: mehdi_amini, bruno.
arphaman added a subscriber: cfe-commits.
arphaman set the repository for this revision to rL LLVM.

The commit r126167 started passing the `First` index into `RemoveDuplicates`, but forgot to update `0` to `First` in the loop that looks for the duplicate. This resulted in a bug where an -iquoted search path was incorrectly removed if you passed in the same path into -iquote and more than one time into -isystem.


Repository:
  rL LLVM

https://reviews.llvm.org/D27298

Files:
  lib/Frontend/InitHeaderSearch.cpp
  test/Frontend/include-duplicate-removal.c


Index: test/Frontend/include-duplicate-removal.c
===================================================================
--- /dev/null
+++ test/Frontend/include-duplicate-removal.c
@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -v -I%S/Inputs -iquote %S/Inputs/SystemHeaderPrefix -isystem %S/Inputs/SystemHeaderPrefix -isystem %S/Inputs/SystemHeaderPrefix %s 2>&1 | FileCheck %s
+
+#include <test.h>
+
+// CHECK: ignoring duplicate directory
+// CHECK-SAME: Inputs/SystemHeaderPrefix"{{$}}
+
+// CHECK:      #include "..."
+// CHECK-NEXT: {{.*}}Inputs/SystemHeaderPrefix{{$}}
+// CHECK-NEXT: #include <...>
+// CHECK-NEXT: {{.*}}Inputs{{$}}
+// CHECK-NEXT: {{.*}}Inputs/SystemHeaderPrefix{{$}}
Index: lib/Frontend/InitHeaderSearch.cpp
===================================================================
--- lib/Frontend/InitHeaderSearch.cpp
+++ lib/Frontend/InitHeaderSearch.cpp
@@ -526,7 +526,7 @@
     if (CurEntry.getDirCharacteristic() != SrcMgr::C_User) {
       // Find the dir that this is the same of.
       unsigned FirstDir;
-      for (FirstDir = 0; ; ++FirstDir) {
+      for (FirstDir = First;; ++FirstDir) {
         assert(FirstDir != i && "Didn't find dupe?");
 
         const DirectoryLookup &SearchEntry = SearchList[FirstDir];


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