Summary:
We were claiming the -f*exceptions arguments when looking for the
RTTIMode. This makes us not warn about unused arguments if compiling a C
file with -fcxx-exceptions.
This patch fixes it by not claiming the exception-related arguments at
that point.
Reviewers: rsmith, samsonov
Subscribers: cfe-commits
Differential Revision: http://reviews.llvm.org/D8507
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@232860
91177308-0d34-0410-b5e6-
96231b3b80d8
// On the PS4, turning on c++ exceptions turns on rtti.
// We're assuming that, if we see -fexceptions, rtti gets turned on.
- Arg *Exceptions = Args.getLastArg(
+ Arg *Exceptions = Args.getLastArgNoClaim(
options::OPT_fcxx_exceptions, options::OPT_fno_cxx_exceptions,
options::OPT_fexceptions, options::OPT_fno_exceptions);
if (Exceptions &&
// No warnings/errors should be emitted for unknown, except if combining
// the vptr sanitizer with -fno-rtti
+// Special case: -fcxx-exceptions in C code should warn about unused arguments
+// RUN: %clang -x c -### -c -fcxx-exceptions %s 2>&1 | FileCheck -check-prefix=CHECK-UNUSED %s
+// CHECK-UNUSED: warning: argument unused during compilation: '-fcxx-exceptions'
+
// RUN: %clang -### -c -fno-rtti -frtti %s 2>&1 | FileCheck -check-prefix=CHECK-RTTI %s
// RUN: %clang -### -c -frtti -fno-rtti %s 2>&1 | FileCheck -check-prefix=CHECK-NO-RTTI %s