Add support for GCC's '__auto_type' extension, per the GCC manual:
https://gcc.gnu.org/onlinedocs/gcc/Typeof.html
Differences from the GCC extension:
* __auto_type is also permitted in C++ (but only in places where
it could appear in C), allowing its use in headers that might
be shared across C and C++, or used from C++98
* __auto_type can be combined with a declarator, as with C++ auto
(for instance, "__auto_type *p")
* multiple variables can be declared in a single __auto_type
declaration, with the C++ semantics (the deduced type must be
the same in each case)
This patch also adds a missing restriction on applying typeof to
a bit-field, which GCC has historically rejected in C (due to
lack of clarity as to whether the operand should be promoted).
The same restriction also applies to __auto_type in C (in both
GCC and Clang).
This also fixes PR25449.
Patch by Nicholas Allegra!
llvm-svn: 252690
diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
index c343283..7f2ef49 100644
--- a/clang/lib/AST/ItaniumMangle.cpp
+++ b/clang/lib/AST/ItaniumMangle.cpp
@@ -2653,9 +2653,11 @@
void CXXNameMangler::mangleType(const AutoType *T) {
QualType D = T->getDeducedType();
// <builtin-type> ::= Da # dependent auto
- if (D.isNull())
+ if (D.isNull()) {
+ assert(T->getKeyword() != AutoTypeKeyword::GNUAutoType &&
+ "shouldn't need to mangle __auto_type!");
Out << (T->isDecltypeAuto() ? "Dc" : "Da");
- else
+ } else
mangleType(D);
}