Power-pc/extern question

Power-pc/extern question

[Crabtree, Andrew]

I've recently joined a team that has a somewhat recurrent problem with
functions being linked to variables and variables being linked to
functions.  It appears that there is no information put into the
assembly file to tell the assembler or linker that something belongs in
the data section or the text section.  All previous compilers I have
used will explictly flag externs as code or data.  Is there anything I
can do (modifying specs, command parameters) to change this behaviour
with the existing compiler?  

Thanks in advance,
Andrew 
Cc's appreciated

Test File 
---------------------------
extern int someexternint;
extern void  someexternfunc();
void nevercalled(void) {
         int i = someexternint;
         someexternfunc();

}
---------------------------

Test file compiled with -S


 # GNU C cygnus-2.7.2-960126
 # -fpeephole -ffunction-cse -fkeep-static-consts -fpcc-struct-return
-fcommon
 # -fgnu-linker -mpowerpc -mnew-mnemonics

        .file   "foo.c"
gcc2_compiled.:
        .section        ".text"
        .align 2
        .globl nevercalled
        .type    nevercalled,@function
nevercalled:
        stwu 1,-24(1)
        mflr 0
        stw 31,20(1)
        stw 0,28(1)
        mr 31,1
        addis 9,0,someexternint@ha
        addi 11,9,someexternint@l
        lwz 0,0(11)
        stw 0,8(31)
        bl someexternfunc
.L1:
        lwz 11,0(1)
        lwz 0,4(11)
        mtlr 0
        lwz 31,-4(11)
        mr 1,11
        blr
.Lfe1:
        .size    nevercalled,.Lfe1-nevercalled
        .ident  "GCC: (GNU) cygnus-2.7.2-960126"
~


[andrewc_top]hprnljf:$$ccppc -v
Reading specs from
/sw/wind/host/parisc-hpux10/lib/gcc-lib/powerpc-wrs-vxworks/cygnus-2.7.2
-960126/specs
gcc driver version cygnus-2.7.2-960126 egcs-971225 tornado 2.0 executing
gcc version cygnus
-2.7.2-960126

*asm:
-u %(asm_cpu) %{V} %{v:%{!V:-V}} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*}
%{Yd,*} %{Wa,*:%*} %{mrelocatable} %{mrelocatable-lib} %{memb} %{msdata:
-memb} %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}

*asm_final:
%{pipe:-}

*cpp:
%{posix: -D_POSIX_SOURCE} %(cpp_sysv) %(cpp_endian) %(cpp_cpu)

*cc1:
%{G*}

*cc1plus:


*endfile:


*link:


*lib:


*libgcc:


*startfile:


*switches_need_spaces:


*signed_char:
%{!fsigned-char:-D__CHAR_UNSIGNED__}

*predefines:
-D__IEEE_BIG_ENDIAN -D__embedded__ -Asystem(embedded) -Acpu(powerpc)
-Amachine(powerpc)

*cross_compile:
1

*multilib:
. !msoft-float !mcpu=860 !mcpu=821 !mcpu=403;soft-float
msoft-float;soft-float mcpu=860;soft-float mcpu=821;soft-float mcpu=403;

*cpp_cpu:
%{!mcpu*:   %{mpower: %{!mpower2: -D_ARCH_PWR}}   %{mpower2:
-D_ARCH_PWR2}   %{mpowerpc*: -D_ARCH_PPC}   %{mno-power: %{!mpowerpc*:
-D_ARCH_COM}}   %{!mno-power: %{!mpower2: %(cpp_default)}}}
%{mcpu=common: -D_ARCH_COM} %{mcpu=power: -D_ARCH_PWR} %{mcpu=power2:
-D_ARCH_PWR2} %{mcpu=powerpc: -D_ARCH_PPC} %{mcpu=rios: -D_ARCH_PWR}
%{mcpu=rios1: -D_ARCH_PWR} %{mcpu=rios2: -D_ARCH_PWR2} %{mcpu=rsc:
-D_ARCH_PWR} %{mcpu=rsc1: -D_ARCH_PWR} %{mcpu=403: -D_ARCH_PPC}
%{mcpu=505: -D_ARCH_PPC} %{mcpu=601: -D_ARCH_PPC -D_ARCH_PWR}
%{mcpu=602: -D_ARCH_PPC} %{mcpu=603: -D_ARCH_PPC} %{mcpu=603e:
-D_ARCH_PPC} %{mcpu=604: -D_ARCH_PPC} %{mcpu=620: -D_ARCH_PPC}
%{mcpu=821: -D_ARCH_PPC} %{mcpu=860: -D_ARCH_PPC}

*cpp_default:
-D_ARCH_PPC

*cpp_sysv:
%{mrelocatable: -D_RELOCATABLE} %{mcall-sysv: -D_CALL_SYSV} %{mcall-nt:
-D_CALL_NT} %{mcall-aix: -D_CALL_AIX} %{mcall-aixdesc: -D_CALL_AIX
-D_CALL_AIXDESC} %{!mcall-sysv: %{!mcall-aix: %{!mcall-aixdesc:
%{!mcall-nt: %(cpp_sysv_default) }}}} %{msoft-float: -D_SOFT_FLOAT}
%{mcpu=403: -D_SOFT_FLOAT} %{mcpu=860: -D_SOFT_FLOAT}

*cpp_sysv_default:
-D_CALL_SYSV

*cpp_endian:
%{mlittle: -D_LITTLE_ENDIAN -Amachine(littleendian)} %{mlittle-endian:
-D_LITTLE_ENDIAN -Amachine(littleendian)} %{!mlittle: %{!mlittle-endian:
-Amachine(bigendian)}}

*asm_cpu:
%{!mcpu*:   %{mpower: %{!mpower2: -mpwr}}   %{mpower2: -mpwrx}
%{mpowerpc*: -mppc}   %{mno-power: %{!mpowerpc*: -mcom}}   %{!mno-power:
%{!mpower2: %(asm_default)}}} %{mcpu=common: -mcom} %{mcpu=power: -mpwr}
%{mcpu=power2: -mpwrx} %{mcpu=powerpc: -mppc} %{mcpu=rios: -mpwr}
%{mcpu=rios1: -mpwr} %{mcpu=rios2: -mpwrx} %{mcpu=rsc: -mpwr}
%{mcpu=rsc1: -mpwr} %{mcpu=403: -mppc} %{mcpu=505: -mppc} %{mcpu=601:
-m601} %{mcpu=602: -mppc} %{mcpu=603: -mppc} %{mcpu=603e: -mppc}
%{mcpu=604: -mppc} %{mcpu=620: -mppc} %{mcpu=821: -mppc} %{mcpu=860:
-mppc}

*asm_default:
-mppc

*link_syscalls:


*link_libg:


*link_path:


*link_start:
%{msim: %{!Ttext*: -Ttext 0x10000000}}