[clang] [Fix] Disable fdefine-target-os-macros for now (PR #74886)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang

@llvm/pr-subscribers-clang-driver

Author: Zixu Wang (zixu-w)

<details>
<summary>Changes</summary>

https://github.com/llvm/llvm-project/pull/74676 landed the work to implement `-fdefine-target-os-macros` and enabled the extension for the Darwin driver. However it is breaking some test builds. Leave the extension disabled for now until we can fix/workaround the build failures.

---
Full diff: https://github.com/llvm/llvm-project/pull/74886.diff


2 Files Affected:

- (modified) clang/lib/Driver/ToolChains/Darwin.cpp (-4) 
- (modified) clang/test/Driver/fdefine-target-os-macros.c (+19-10) 


``````````diff
diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
index d3005d69e92bb..f09bc27d7d2c0 100644
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -2916,10 +2916,6 @@ void Darwin::addClangTargetOptions(const llvm::opt::ArgList &DriverArgs,
   // to fix the same problem with C++ headers, and is generally fragile.
   if (!sdkSupportsBuiltinModules(TargetPlatform, SDKInfo))
     CC1Args.push_back("-fbuiltin-headers-in-system-modules");
-
-  if (!DriverArgs.hasArgNoClaim(options::OPT_fdefine_target_os_macros,
-                                options::OPT_fno_define_target_os_macros))
-    CC1Args.push_back("-fdefine-target-os-macros");
 }
 
 void Darwin::addClangCC1ASTargetOptions(
diff --git a/clang/test/Driver/fdefine-target-os-macros.c b/clang/test/Driver/fdefine-target-os-macros.c
index d7379dd3d5396..030d4ce34cb28 100644
--- a/clang/test/Driver/fdefine-target-os-macros.c
+++ b/clang/test/Driver/fdefine-target-os-macros.c
@@ -1,11 +1,12 @@
 // RUN: %clang -### --target=arm64-apple-darwin %s 2>&1 | FileCheck %s --check-prefix=DARWIN-DEFAULT
-// DARWIN-DEFAULT: "-fdefine-target-os-macros"
+// DARWIN-DEFAULT-NOT: "-fdefine-target-os-macros"
 
 // RUN: %clang -### --target=arm-none-linux-gnu %s 2>&1 | FileCheck %s --check-prefix=NON-DARWIN-DEFAULT
 // RUN: %clang -### --target=x86_64-pc-win32 %s 2>&1 | FileCheck %s --check-prefix=NON-DARWIN-DEFAULT
 // NON-DARWIN-DEFAULT-NOT: "-fdefine-target-os-macros"
 
-// RUN: %clang -dM -E --target=arm64-apple-macos %s 2>&1 \
+// RUN: %clang -dM -E --target=arm64-apple-macos \
+// RUN:        -fdefine-target-os-macros %s 2>&1 \
 // RUN: | FileCheck %s -DMAC=1         \
 // RUN:                -DOSX=1         \
 // RUN:                -DIPHONE=0      \
@@ -20,7 +21,8 @@
 // RUN:                -DLINUX=0       \
 // RUN:                -DUNIX=0
 
-// RUN: %clang -dM -E --target=arm64-apple-ios %s 2>&1 \
+// RUN: %clang -dM -E --target=arm64-apple-ios \
+// RUN:        -fdefine-target-os-macros %s 2>&1 \
 // RUN: | FileCheck %s -DMAC=1         \
 // RUN:                -DOSX=0         \
 // RUN:                -DIPHONE=1      \
@@ -35,7 +37,8 @@
 // RUN:                -DLINUX=0       \
 // RUN:                -DUNIX=0
 
-// RUN: %clang -dM -E --target=arm64-apple-ios-macabi %s 2>&1 \
+// RUN: %clang -dM -E --target=arm64-apple-ios-macabi \
+// RUN:        -fdefine-target-os-macros %s 2>&1 \
 // RUN: | FileCheck %s -DMAC=1         \
 // RUN:                -DOSX=0         \
 // RUN:                -DIPHONE=1      \
@@ -50,7 +53,8 @@
 // RUN:                -DLINUX=0       \
 // RUN:                -DUNIX=0
 
-// RUN: %clang -dM -E --target=arm64-apple-ios-simulator %s 2>&1 \
+// RUN: %clang -dM -E --target=arm64-apple-ios-simulator \
+// RUN:        -fdefine-target-os-macros %s 2>&1 \
 // RUN: | FileCheck %s -DMAC=1         \
 // RUN:                -DOSX=0         \
 // RUN:                -DIPHONE=1      \
@@ -65,7 +69,8 @@
 // RUN:                -DLINUX=0       \
 // RUN:                -DUNIX=0
 
-// RUN: %clang -dM -E --target=arm64-apple-tvos %s 2>&1 \
+// RUN: %clang -dM -E --target=arm64-apple-tvos \
+// RUN:        -fdefine-target-os-macros %s 2>&1 \
 // RUN: | FileCheck %s -DMAC=1         \
 // RUN:                -DOSX=0         \
 // RUN:                -DIPHONE=1      \
@@ -80,7 +85,8 @@
 // RUN:                -DLINUX=0       \
 // RUN:                -DUNIX=0
 
-// RUN: %clang -dM -E --target=arm64-apple-tvos-simulator %s 2>&1 \
+// RUN: %clang -dM -E --target=arm64-apple-tvos-simulator \
+// RUN:        -fdefine-target-os-macros %s 2>&1 \
 // RUN: | FileCheck %s -DMAC=1         \
 // RUN:                -DOSX=0         \
 // RUN:                -DIPHONE=1      \
@@ -95,7 +101,8 @@
 // RUN:                -DLINUX=0       \
 // RUN:                -DUNIX=0
 
-// RUN: %clang -dM -E --target=arm64-apple-watchos %s 2>&1 \
+// RUN: %clang -dM -E --target=arm64-apple-watchos \
+// RUN:        -fdefine-target-os-macros %s 2>&1 \
 // RUN: | FileCheck %s -DMAC=1         \
 // RUN:                -DOSX=0         \
 // RUN:                -DIPHONE=1      \
@@ -110,7 +117,8 @@
 // RUN:                -DLINUX=0       \
 // RUN:                -DUNIX=0
 
-// RUN: %clang -dM -E --target=arm64-apple-watchos-simulator %s 2>&1 \
+// RUN: %clang -dM -E --target=arm64-apple-watchos-simulator \
+// RUN:        -fdefine-target-os-macros %s 2>&1 \
 // RUN: | FileCheck %s -DMAC=1         \
 // RUN:                -DOSX=0         \
 // RUN:                -DIPHONE=1      \
@@ -125,7 +133,8 @@
 // RUN:                -DLINUX=0       \
 // RUN:                -DUNIX=0
 
-// RUN: %clang -dM -E --target=arm64-apple-driverkit %s 2>&1 \
+// RUN: %clang -dM -E --target=arm64-apple-driverkit \
+// RUN:        -fdefine-target-os-macros %s 2>&1 \
 // RUN: | FileCheck %s -DMAC=1         \
 // RUN:                -DOSX=0         \
 // RUN:                -DIPHONE=0      \

``````````

</details>


https://github.com/llvm/llvm-project/pull/74886