Compiling for ARM with -g and -O0 failed

[llvmbot]

Bugzilla Link	2674
Resolution	FIXED
Resolved on	Aug 18, 2008 04:01
Version	trunk
OS	Linux
Reporter	LLVM Bugzilla Contributor
CC	@asl

Extended Description

Hi,

When compiling a .bc file for arm with llc, I ran into the following error:

llvm-gcc -emit-llvm -c -g -O0 test.c -o test.bc
llc -f -march=arm test.bc

Cannot yet select llvm.dbg.declare: 0x8aa97dc: ch = declare 0x8aa928c, 0x8aa96cc, 0x8aa9b0cllc[0x88dd77d]
/lib/tls/libc.so.6(abort+0x109)[0xb7d080c9]
llc[0x8221b08]
[0x0]
Abandon

This error occure only when the .bc file is obtain with -g and -0O passed to llvm-gcc.

[asl]

I doubt we support debug information on ARM currently. So this should be effectively lowered to no-op....

[lattner]

Sounds like we should just drop the debug insns (mark them illegal) on arm until it has debug support.

[llvmbot]

ARMAsmPrinter can print dwarf line numbers, but not more. It's currently asserting in
int ARMRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
assert(0 && "What is the dwarf register number");
return -1;
}

I've commented out calls to dwarf writer in ARMAsmPrinter.cpp for now.