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c/7577: GCC 3.1 has problems with -gdwarf+ option linking the linux kernel

From: aloeff at de dot ibm dot com
To: gcc-gnats at gcc dot gnu dot org
Date: 12 Aug 2002 09:55:56 -0000
Subject: c/7577: GCC 3.1 has problems with -gdwarf+ option linking the linux kernel
Reply-to: aloeff at de dot ibm dot com

>Number:         7577
>Category:       c
>Synopsis:       GCC 3.1 has problems with -gdwarf+ option linking the linux kernel
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Mon Aug 12 02:56:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Andreas Loeffler
>Release:        gcc version 3.1
>Organization:
>Environment:
powerpc-linux cross compiler
Configured with: ../configure --host=i586-pc-linux-gnu --target=powerpc-linux --prefix=/opt/fsp/i586-pc-linux-gnu/local --enable-shared --enable-languages=c,c++,f77 --with-headers=/opt/fsp/powerpc-linux/include --with-libs=/opt/fsp/powerpc-linux/lib --with-cpu=403 --without-fp
Thread model: single
>Description:
while trying to compile and link the linux kernel we get 
a lot of messeages like the lines below:
arch/ppc/kernel/kernel.o(.debug+0x4e678d): undefined reference to `.L_E7576'
arch/ppc/kernel/kernel.o(.debug+0x4e67a3): undefined reference to `.L_E7577'
arch/ppc/kernel/kernel.o(.debug+0x4e67b9): undefined reference to `.L_E7580'
we see this if we compile with -gdwarf+

we then tried to figure out where those .L_E* symbols came from
obviously they were generated by the compiler
our testcase is derived from one of the kernel source files
and it looks like that the __inline__ is causing the problem

we compiled the code with:
powerpc-linux-gcc -D__KERNEL__ -Wall -O2 -gdwarf+ -mcpu=403 -Wa,-m403 -save-temps -c bla.c
and then grep'ed for the symbols: powerpc-linux-objdump -Sawx bla.o | grep L_E
00000000         *UND*	00000000 .L_E9269
00000000         *UND*	00000000 .L_E9268
00000000         *UND*	00000000 .L_E9271
00000000         *UND*	00000000 .L_E9272

the symbols are gone without the __inline__
or using -gdwarf-2 option instead but that doesn't help us
we need dwarf+ for our debugger
>How-To-Repeat:
powerpc-linux-gcc -D__KERNEL__ -Wall -O2 -gdwarf+ -mcpu=403 -Wa,-m403 -save-temps -c bla.c
powerpc-linux-objdump -Sawx bla.o | grep L_E
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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