Reduced from linux-2.4.22/kernel/kmod.c:call_usermodehelper().
Ordinary gcc accepts this code, which makes use of the ancient
pre-C99 syntax for partial structure initialization, so it's
technically a "C extension". Linux seems to use this syntax a
lot.

419 gally> cat kmod4.c
typedef struct { int foo; } spinlock_t;
typedef struct wait_queue_head_t { spinlock_t lock; } wait_queue_head_t;
void call_usermodehelper(void) { struct wait_queue_head_t work = { lock:
(spinlock_t) { 0 }, }; }

420 gally> llvm-gcc -c kmod4.c
kmod4.c: In function `call_usermodehelper':
kmod4.c:3: internal compiler error: tree check: expected constructor, have
compound_literal_expr in llvm_expand_constructor_elements, at llvm-expand.c:3305

It doesn't seem to like the C99 syntax  (... { .lock = (spinlock_t) ...) either.

Fixed.

Testcase: test/Regression/CFrontend/2003-11-01-C99-CompoundLiteral.c

Thanks!

-Chris