[PATCH] D52524: Add -Wno-poison-system-directories flag

[Denis Nikitin via Phabricator via cfe-commits]

denik updated this revision to Diff 215260.
denik added a comment.
Herald added a subscriber: ormris.

Updated the code (removed Diag propagation).
Added test cases.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D52524/new/

https://reviews.llvm.org/D52524

Files:
  clang/include/clang/Basic/DiagnosticCommonKinds.td
  clang/include/clang/Basic/DiagnosticGroups.td
  clang/lib/Frontend/InitHeaderSearch.cpp
  clang/test/Frontend/Inputs/sysroot_x86_64_cross_linux_tree/lib/.keep
  clang/test/Frontend/Inputs/sysroot_x86_64_cross_linux_tree/usr/include/c++/.keep
  clang/test/Frontend/Inputs/sysroot_x86_64_cross_linux_tree/usr/lib/gcc/.keep
  clang/test/Frontend/Inputs/sysroot_x86_64_cross_linux_tree/usr/local/include/.keep
  clang/test/Frontend/Inputs/sysroot_x86_64_cross_linux_tree/usr/local/lib/.keep
  clang/test/Frontend/warning-poison-system-directory.c


Index: clang/test/Frontend/warning-poison-system-directory.c
===================================================================
--- /dev/null
+++ clang/test/Frontend/warning-poison-system-directory.c
@@ -0,0 +1,18 @@
+// System directory and sysroot option causes warning.
+// RUN: %clang -target x86_64 -I/usr/include --sysroot %S/Inputs/sysroot_x86_64_cross_linux_tree -c -o - %s 2> %t.1.stderr
+// RUN: FileCheck -check-prefix=WARN < %t.1.stderr %s
+// RUN: %clang -target x86_64 -cxx-isystem/usr/include --sysroot %S/Inputs/sysroot_x86_64_cross_linux_tree -c -o - %s 2> %t.1.stderr
+// RUN: FileCheck -check-prefix=WARN < %t.1.stderr %s
+// RUN: %clang -target x86_64 -iquote/usr/local/include --sysroot %S/Inputs/sysroot_x86_64_cross_linux_tree -c -o - %s 2> %t.1.stderr
+// RUN: FileCheck -check-prefix=WARN < %t.1.stderr %s
+// RUN: %clang -target x86_64 -isystem/usr/local/include --sysroot %S/Inputs/sysroot_x86_64_cross_linux_tree -c -o - %s 2> %t.1.stderr
+// RUN: FileCheck -check-prefix=WARN < %t.1.stderr %s
+
+// Missing target but included sysroot still causes the warning.
+// RUN: %clang -I/usr/include --sysroot %S/Inputs/sysroot_x86_64_cross_linux_tree -c -o - %s 2> %t.2.stderr
+// RUN: FileCheck -check-prefix=WARN < %t.2.stderr %s
+
+// Cros target without sysroot causes no warning.
+// RUN: %clang -Werror -target x86_64 -I/usr/include -c -o - %s
+
+// WARN: warning: include location {{[^ ]+}} is unsafe for cross-compilation [-Wpoison-system-directories]
Index: clang/lib/Frontend/InitHeaderSearch.cpp
===================================================================
--- clang/lib/Frontend/InitHeaderSearch.cpp
+++ clang/lib/Frontend/InitHeaderSearch.cpp
@@ -137,6 +137,17 @@
   SmallString<256> MappedPathStorage;
   StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
 
+  // If use system headers/libraries while cross-compiling,
+  // emit the warning.
+  if (HasSysroot) {
+    if(MappedPathStr.startswith("/usr/include") ||
+       MappedPathStr.startswith("/usr/local/include") ||
+       MappedPathStr.startswith("/lib") ||
+       MappedPathStr.startswith("/usr/local/lib")) {
+         Headers.getDiags().Report(diag::warn_poison_system_directories) << MappedPathStr.str();
+       }
+  }
+
   // Compute the DirectoryLookup type.
   SrcMgr::CharacteristicKind Type;
   if (Group == Quoted || Group == Angled || Group == IndexHeaderMap) {
Index: clang/include/clang/Basic/DiagnosticGroups.td
===================================================================
--- clang/include/clang/Basic/DiagnosticGroups.td
+++ clang/include/clang/Basic/DiagnosticGroups.td
@@ -1066,6 +1066,10 @@
 // multiversioning.
 def FunctionMultiVersioning : DiagGroup<"function-multiversion">;
 
+// A warning group for warnings about including system headers when
+// cross-compiling.
+def PoisonSystemDirectories : DiagGroup<"poison-system-directories">;
+
 def NoDeref : DiagGroup<"noderef">;
 
 // A group for cross translation unit static analysis related warnings.
Index: clang/include/clang/Basic/DiagnosticCommonKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticCommonKinds.td
+++ clang/include/clang/Basic/DiagnosticCommonKinds.td
@@ -304,4 +304,7 @@
     "no analyzer checkers or packages are associated with '%0'">;
 def note_suggest_disabling_all_checkers : Note<
     "use -analyzer-disable-all-checks to disable all static analyzer checkers">;
+
+// Poison system directories.
+def warn_poison_system_directories : Warning <"include location '%0' is unsafe for cross-compilation">, InGroup<PoisonSystemDirectories>;
 }


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