Build failure on arm

[llvmbot]

Bugzilla Link	9081
Resolution	FIXED
Resolved on	Feb 02, 2011 03:17
Version	trunk
OS	Linux
Reporter	LLVM Bugzilla Contributor
CC	@asl,@nlewycky

Extended Description

I'm compiling llvm on a Tegra2 system, with Ubuntu 10.10 ( gcc 4.4.5).
Compiling llvm gives this compile failure:

llvm[3]: Compiling ARMInstrInfo.cpp for Release+Asserts build
llvm[3]: Compiling ARMJITInfo.cpp for Release+Asserts build
/tmp/ccn7l1UL.s: Assembler messages:
/tmp/ccn7l1UL.s:31: Error: LR and PC should not both be in register list -- ldmia sp!,{r0,r1,r2,r3,lr,pc}' make[3]: *** [/home/scoopr/Code/llvm-build/lib/Target/ARM/Release+Asserts/ARMJITInfo.o] Error 1 make[3]: Leaving directory /home/scoopr/Code/llvm-build/lib/Target/ARM'
make[2]: *** [ARM/.makeall] Error 2
make[2]: Leaving directory /home/scoopr/Code/llvm-build/lib/Target' make[1]: *** [Target/.makeall] Error 2 make[1]: Leaving directory /home/scoopr/Code/llvm-build/lib'
make: *** [all] Error 1

[llvmbot]

For completeness sake:
scoopr@ac100:~$ as --version
GNU assembler (GNU Binutils for Ubuntu) 2.20.51-system.20100908

[llvmbot]

Mikko, as far as I can tell from your description, this is a bug in the compiler you're using to build llvm, which you say is gcc-4.4.5. Having both LR and PC in the register list for an LDM instruction is either totally invalid (Thumb mode) or deprecated (ARM mode). The compiler should never generate that instruction.

Just in case, I took a quick look at LLVM's handling of this, and I don't see any possibility of such an instruction being generated. If you still think this is a bug in LLVM, you'll need to provide a reproducible testcase so we can figure out where it's going wrong.

[asl]

Bob, this is a bug in the inline assembler inside ARMJITInfo.cpp

[llvmbot]

So it is...

[llvmbot]

I attempted a fix in svn r124694. Please let me know if that doesn't work.

[llvmbot]

*** Bug #6437 has been marked as a duplicate of this bug. ***