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From: "joel at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/65779] New: undefined local symbol on powerpc
Date: Wed, 15 Apr 2015 21:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65779

            Bug ID: 65779
           Summary: undefined local symbol on powerpc
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: joel at gcc dot gnu.org

Created attachment 35323
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35323&action=edit
Preprocessed source from zlib.c from RTEMS PowerPC bootloader

This file compiled without an undefined symbol with many gcc versions prior to
5.x.

powerpc-rtems4.11-gcc (GCC) 5.0.0 20150412 (experimental)

Fails:  powerpc-rtems4.11-gcc -mrelocatable -mcpu=603e -O2 -g zlib_pp.c 
Passes: powerpc-rtems4.11-gcc -mcpu=603e -O2 -g zlib_pp.c
Fails:  powerpc-rtems4.11-gcc -mrelocatable  -O2 -g zlib_pp.c

Also passes at -Os, -O0, and -O1.

The error is that the assembly language produced has a .4byte directive with a
reference to a symbol that is not generated.

$ grep LCL2 zlib_pp.s 
.LCL22:
    lwz 0,.LCL22-.LCF22(30)
.LCL23:
    lwz 0,.LCL23-.LCF23(30)
.LCL24:
    lwz 0,.LCL24-.LCF24(30)
.LCL25:
    lwz 0,.LCL25-.LCF25(30)
    .4byte    .LCL2
    .4byte    .LCL2