[PATCH] D83250: [clang] Enable errors for undefined TARGET_OS_ macros in Darwin driver

[Zixu Wang via Phabricator via cfe-commits]

zixuw updated this revision to Diff 275821.
zixuw added a comment.

Add a test case.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D83250/new/

https://reviews.llvm.org/D83250

Files:
  clang/lib/Driver/ToolChains/Darwin.cpp
  clang/test/Driver/darwin-warning-options.c


Index: clang/test/Driver/darwin-warning-options.c
===================================================================
--- /dev/null
+++ clang/test/Driver/darwin-warning-options.c
@@ -0,0 +1,7 @@
+// REQUIRES: system-darwin
+
+// Always error about undefined 'TARGET_OS_*' macros on Darwin.
+// RUN: %clang -### %s 2>&1 | FileCheck %s
+
+// CHECK-DAG: "-Wundef-prefix=TARGET_OS_"
+// CHECK-DAG: "-Werror=undef-prefix"
Index: clang/lib/Driver/ToolChains/Darwin.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Darwin.cpp
+++ clang/lib/Driver/ToolChains/Darwin.cpp
@@ -954,6 +954,10 @@
     : Darwin(D, Triple, Args) {}
 
 void DarwinClang::addClangWarningOptions(ArgStringList &CC1Args) const {
+  // Always error about undefined 'TARGET_OS_*' macros.
+  CC1Args.push_back("-Wundef-prefix=TARGET_OS_");
+  CC1Args.push_back("-Werror=undef-prefix");
+
   // For modern targets, promote certain warnings to errors.
   if (isTargetWatchOSBased() || getTriple().isArch64Bit()) {
     // Always enable -Wdeprecated-objc-isa-usage and promote it


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