Hello.
The following code, which was only generating two warnings with an old
version of clang, now also causes a crash.
$ cat bug.c
struct S {
union U {
int i;
double d;
} u;
};
struct S s = {
.u = { .i = 0, .d = 0.0 },
.u = { 0 },
};
$ clang -c bug.c
bug.c:9:19: warning: initializer overrides prior initialization of this
subobject [-Winitializer-overrides]
.u = { .i = 0, .d = 0.0 },
~^
bug.c:9:15: note: previous initialization is here
.u = { .i = 0, .d = 0.0 },
^
bug.c:10:10: warning: initializer overrides prior initialization of this
subobject [-Winitializer-overrides]
.u = { 0 },
^
bug.c:9:23: note: previous initialization is here
.u = { .i = 0, .d = 0.0 },
^~~
llvm/tools/clang/lib/Sema/../../include/clang/AST/Expr.h:3830: void
clang::InitListExpr::setInitializedFieldInUnion(clang::FieldDecl*):
Assertion `(FD == 0 || getInitializedFieldInUnion() == 0 ||
getInitializedFieldInUnion() == FD) && "Only one field of a union may be
initialized at a time!"' failed.
[...]
19 clang 0x00000000014ef843
clang::InitializationSequence::Perform(clang::Sema&,
clang::InitializedEntity const&, clang::InitializationKind const&,
llvm::MutableArrayRef<clang::Expr*>, clang::QualType*) + 7919
20 clang 0x000000000132621a
clang::Sema::AddInitializerToDecl(clang::Decl*, clang::Expr*, bool,
bool) + 4648
[...]
clang version 3.5 (trunk 195545)
Target: x86_64-unknown-linux-gnu
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