Testcase:

static void query_newnamebuf(void) { ((void)"query_newnamebuf"); }

How to reproduce bug:
copy the above line into foobar.i and run:
    > llvm-gcc foobar.i
and you will see:
foobar.i: In function `query_newnamebuf':

foobar.i:4: internal compiler error: Segmentation fault
Please submit a full bug report,
[yadda yadda yadda.]

Testcase here: test/Regression/CFrontend/2003-11-12-VoidString.c

This is now fixed.  The patch:

$ diff -u llvm-expand.c~ llvm-expand.c
--- llvm-expand.c~      2003-11-08 22:13:27.000000000 -0600
+++ llvm-expand.c       2003-11-12 16:21:24.000000000 -0600
@@ -5064,7 +5064,8 @@
     break;
 
   case STRING_CST:
-    llvm_expand_constructor(Fn, exp, DestLoc, 0);
+    if (DestLoc)
+      llvm_expand_constructor(Fn, exp, DestLoc, 0);
     break;
   case CONSTRUCTOR:
     assert(isDestTyComposite && "Constructor for non-composite type?");