Revert "[Clang][Driver] Warn about -c/-S with -fsyntax-only"

[dyung]

Reverts #98607

The test added was failing on some build bots:

• https://lab.llvm.org/buildbot/#/builders/144/builds/2918
• https://lab.llvm.org/buildbot/#/builders/46/builds/2069

[llvmbot]

@llvm/pr-subscribers-clang

@llvm/pr-subscribers-clang-driver

Author: None (dyung)

Changes

Reverts llvm/llvm-project#98607

The test added was failing on some build bots:

• https://lab.llvm.org/buildbot/#/builders/144/builds/2918
• https://lab.llvm.org/buildbot/#/builders/46/builds/2069

---

Full diff: https://github.com/llvm/llvm-project/pull/100052.diff

2 Files Affected:

• (modified) clang/lib/Driver/ToolChains/Clang.cpp (+4)
• (removed) clang/test/Driver/warn-fsyntax-only.c (-7)

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index f881fe8c395f8..f240a47504ef6 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -794,6 +794,10 @@ static void addPGOAndCoverageFlags(const ToolChain &TC, Compilation &C,
       Args.hasArg(options::OPT_coverage))
     FProfileDir = Args.getLastArg(options::OPT_fprofile_dir);
 
+  // TODO: Don't claim -c/-S to warn about -fsyntax-only -c/-S, -E -c/-S,
+  // like we warn about -fsyntax-only -E.
+  (void)(Args.hasArg(options::OPT_c) || Args.hasArg(options::OPT_S));
+
   // Put the .gcno and .gcda files (if needed) next to the primary output file,
   // or fall back to a file in the current directory for `clang -c --coverage
   // d/a.c` in the absence of -o.
diff --git a/clang/test/Driver/warn-fsyntax-only.c b/clang/test/Driver/warn-fsyntax-only.c
deleted file mode 100644
index b4cf74fc59855..0000000000000
--- a/clang/test/Driver/warn-fsyntax-only.c
+++ /dev/null
@@ -1,7 +0,0 @@
-// RUN: %clang -fsyntax-only -E %s 2>&1 | FileCheck %s --check-prefix=CHECK-PP
-// RUN: %clang -fsyntax-only -S %s 2>&1 | FileCheck %s --check-prefix=CHECK-ASM
-// RUN: %clang -fsyntax-only -c %s 2>&1 | FileCheck %s --check-prefix=CHECK-OBJ
-
-// CHECK-PP:  warning: argument unused during compilation: '-fsyntax-only' [-Wunused-command-line-argument]
-// CHECK-ASM: warning: argument unused during compilation: '-S' [-Wunused-command-line-argument]
-// CHECK-OBJ: warning: argument unused during compilation: '-c' [-Wunused-command-line-argument]