diff options
| -rw-r--r-- | clang/Driver/clang.cpp | 2 | ||||
| -rw-r--r-- | clang/test/Sema/unused-expr.c | 7 |
2 files changed, 7 insertions, 2 deletions
diff --git a/clang/Driver/clang.cpp b/clang/Driver/clang.cpp index a2578a4f797..deea08c3353 100644 --- a/clang/Driver/clang.cpp +++ b/clang/Driver/clang.cpp @@ -219,7 +219,7 @@ Freestanding("ffreestanding", static llvm::cl::opt<bool> MathErrno("fmath-errno", llvm::cl::desc("Require math functions to respect errno"), - llvm::cl::init(true)); + llvm::cl::init(true), llvm::cl::AllowInverse); //===----------------------------------------------------------------------===// // Analyzer Options. diff --git a/clang/test/Sema/unused-expr.c b/clang/test/Sema/unused-expr.c index 4cc829be046..a44d1c8fed4 100644 --- a/clang/test/Sema/unused-expr.c +++ b/clang/test/Sema/unused-expr.c @@ -1,7 +1,9 @@ -// RUN: clang -fsyntax-only -verify %s +// RUN: clang -fsyntax-only -verify -fno-math-errno %s int foo(int X, int Y); +double sqrt(double X); // implicitly const because of -fno-math-errno! + void bar(volatile int *VP, int *P, int A, _Complex double C, volatile _Complex double VC) { @@ -21,6 +23,9 @@ void bar(volatile int *VP, int *P, int A, __real__ C; // expected-warning {{expression result unused}} __real__ VC; + + // We know this can't change errno because of -fno-math-errno. + sqrt(A); // expected-warning {{expression result unused}} } extern void t1(); |
