http://llvm.org/bugs/show_bug.cgi?id=19556
Bug ID: 19556
Summary: GCC extension rejected in C++ mode
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Here's some evil code from glibc's mathinline.h.
$ cat evil.cc
int foo(double __x) {
return (__extension__
(((((union { double __d; int __i[2]; }) {__d: __x}).__i[1]))));
}
$ clang evil.cc
evil.cc:3:17: error: '(anonymous union at evil.cc:3:17)' cannot be defined in a
type specifier
(((((union { double __d; int __i[2]; }) {__d: __x}).__i[1]))));
^
evil.cc:3:53: warning: use of GNU old-style field designator extension
[-Wgnu-designator]
(((((union { double __d; int __i[2]; }) {__d: __x}).__i[1]))));
^~~~
.__d =
evil.cc:3:63: error: member reference base type 'void' is not a structure or
union
(((((union { double __d; int __i[2]; }) {__d: __x}).__i[1]))));
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
1 warning and 2 errors generated.
We accept this beast in C mode, but reject it as C++. GCC accepts it in C++
code too.
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