I will post a reduced test case as an attachment.

Created an attachment (id=3) [details]
reduced testcase from sched.c

The code tries to statically initialize a union with a constant initializer.
Apparently llvm-gcc thinks the type of the initializer doesn't match the type
of the union, or something.

I get the error message:

cc1: ../../gcc-3.4/gcc/llvm-expand.c:3237: llvm_expand_constructor_element:
Assertion `0 && "Cannot adjust type of aggregate constant initializer!"'
failed.
bug.i:14: internal compiler error: Aborted

I wonder why llvm_type_is_composite didn't return true for this?

We found a simpler test case, this time reduced from linux-2.4.22/fs/buffer.c.

503 gally> cat carp4.c

union bdflush_param {
    struct { int x; } b_un;
    int y[1];
} bdf_prm = {{30}};

This is now fixed.

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

It's possible that there are other bugs similar to this one, which haven't been
fixed.  If you run into any more, please reopen this bug and add another testcase.

Thanks,

-Chris