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

[Zixu Wang via cfe-commits]

https://github.com/zixu-w created https://github.com/llvm/llvm-project/pull/74886

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.

>From 63be986f612c175559efffed9daebcb944fa5cea Mon Sep 17 00:00:00 2001
From: Zixu Wang <zixu_wang at apple.com>
Date: Fri, 8 Dec 2023 12:58:15 -0800
Subject: [PATCH] [Fix] Disable fdefine-target-os-macros for now

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.
---
 clang/lib/Driver/ToolChains/Darwin.cpp       |  4 ---
 clang/test/Driver/fdefine-target-os-macros.c | 29 +++++++++++++-------
 2 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
index d3005d69e92bbf..f09bc27d7d2c0e 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 d7379dd3d5396b..030d4ce34cb282 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      \