When a declaration of a function is missing an exception specification

that was present in a prior declaration, emit a warning rather than a
hard error (which we did before, and still do with mismatched
exception specifications). Moreover, provide a fix-it hint with the
throw() clause that should be added, e.g.,

t.C:10:7: warning: 'operator new' is missing exception specification
      'throw(std::bad_alloc)'
void *operator new(unsigned long sz)
      ^
                                     throw(std::bad_alloc)

As part of this, disable the warning when we're missing an exception
specification on operator new, operator new[], operator delete, or
operator delete[] when exceptions are turned off (-fno-exceptions).

Fixes PR5957.

llvm-svn: 99388

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/test/FixIt/fixit.cpp b/clang/test/FixIt/fixit.cpp
index ee93755775e..79c294b1d92 100644
--- a/clang/test/FixIt/fixit.cpp
+++ b/clang/test/FixIt/fixit.cpp
@@ -37,3 +37,6 @@ protected:
 class B : public A {
   A::foo; // expected-warning{{access declarations are deprecated}}
 };
+
+void f() throw();
+void f(); // expected-warning{{missing exception specification}}