gcc address-of-label extension broken

[Jukka Lehtosalo]

Binary package hint: llvm

When compiling C code that uses the gcc address-of-label extension using clang, the generated assembly is broken.

There is an upstream fix available for llvm:
http://llvm.org/bugs/show_bug.cgi?id=6608

I get the following error when compiling the example program in the above bug report:

$ cat test.c
int main(int argc, char**argv)
{
    const void *const jump_table[] = { &&lbl1, &&lbl2} ;
    goto *jump_table[0];
lbl1:
    return 1;
lbl2:
    return 0;
}
$ clang test.c
/tmp/cc-TYZ5AK.s: Assembler messages:
/tmp/cc-TYZ5AK.s:22: Error: symbol `.LBA4_main_' is already defined
clang: error: assembler command failed with exit code 1 (use -v to see
invocation)

Ubuntu version: Ubuntu 10.04 LTS
llvm package version: 2.7-0ubuntu1

[Anton Korobeynikov (anton-korobeynikov)]

LLVM bug was fixed in the mainline. The fix will definitely go into LLVM 2.8