[LLVMbugs] [Bug 958] NEW: case branch tables: as complains "complex expression, absolute segment assumed"

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Thu Oct 19 15:20:29 PDT 2006


           Summary: case branch tables: as complains "complex expression,
                    absolute segment assumed"
           Product: tools
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: blocker
          Priority: P2
         Component: llvm-gcc
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: scottm at aero.org

Not sure if the problem is with the assembler or if it is a gcc frontend issue.
However, for gcc/config/darwin-crt3.c:run_routines as well as numerous messages
from compiling gcc/unwind-dw2-fde.c, it's clear that case statements are a
problem. I've attached a patch to work around this issue for the time being to
get a working front end, but clearly this will be an issue.

The version of as installed on my Mac OS 10.4.8 system reports itself as "Apple
Computer, Inc. version cctools-590.18.obj~10, GNU assembler version 1.38" (which
may be the problem, but it's also an issue on 10.3.9 systems too.)

The as statements look like:

LBB8_8:	;bb17

; ...

LBB8_11:	;bb22

; ...

	.align	2
	.set L8_0_set_8,LBB8_8-LJTI8_0      ; "complex expression, absolute segment
	.set L8_0_set_11,LBB8_11-LJTI8_0    ; "complex expression, absolute segment
	.long	 L8_0_set_8
	.long	 L8_0_set_11
	.long	 L8_0_set_8
	.long	 L8_0_set_11
	.long	 L8_0_set_8
	.long	 L8_0_set_11

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