[clang] Fix erroneous warning. (PR #79821)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Zahira Ammarguellat (zahiraam)

<details>
<summary>Changes</summary>

This patch is to remove erroneous warning. See https://godbolt.org/z/bYP8P8nqY

---
Full diff: https://github.com/llvm/llvm-project/pull/79821.diff


2 Files Affected:

- (modified) clang/lib/Driver/ToolChains/Clang.cpp (+1-1) 
- (modified) clang/test/Driver/range.c (+4) 


``````````diff
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 8d8965fdf76fb8a..7ceb248f7afb99e 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -2705,7 +2705,7 @@ static StringRef EnumComplexRangeToStr(LangOptions::ComplexRangeKind Range) {
 static void EmitComplexRangeDiag(const Driver &D,
                                  LangOptions::ComplexRangeKind Range1,
                                  LangOptions::ComplexRangeKind Range2) {
-  if (Range1 != LangOptions::ComplexRangeKind::CX_Full)
+  if (Range1 != Range2 && Range1 != LangOptions::ComplexRangeKind::CX_None)
     D.Diag(clang::diag::warn_drv_overriding_option)
         << EnumComplexRangeToStr(Range1) << EnumComplexRangeToStr(Range2);
 }
diff --git a/clang/test/Driver/range.c b/clang/test/Driver/range.c
index 045d9c7d3d802ae..023b5cffbe3e0e4 100644
--- a/clang/test/Driver/range.c
+++ b/clang/test/Driver/range.c
@@ -35,6 +35,9 @@
 // RUN: %clang -### -target x86_64 -ffast-math -fno-cx-limited-range -c %s 2>&1 \
 // RUN:   | FileCheck --check-prefix=FULL %s
 
+// RUN: %clang -c -target x86_64 -fcx-limited-range %s -Xclang -verify=range
+// RUN: %clang -c -target x86_64 -fcx-fortran-rules %s -Xclang -verify=range
+
 // LMTD: -complex-range=limited
 // FULL: -complex-range=full
 // LMTD-NOT: -complex-range=fortran
@@ -44,3 +47,4 @@
 // CHECK-NOT: -complex-range=fortran
 // WARN1: warning: overriding '-fcx-limited-range' option with '-fcx-fortran-rules' [-Woverriding-option]
 // WARN2: warning: overriding '-fcx-fortran-rules' option with '-fcx-limited-range' [-Woverriding-option]
+// range-no-diagnostics

``````````

</details>


https://github.com/llvm/llvm-project/pull/79821