🚀 go-pugleaf

Dear GNU:

We are so-far satisfied users of 'gcc' version 1.39 on our Sun 
SPARC/2 running SunOS 4.1.1.  We recently began to investigate 
creating our own shared libraries.  To do so, all object code
must be PIC, or "position independent code".  In PIC, all 
references to external data objects are generated as dereferences
of entries in a "Global Offset Table".  At run time, the dynamic
linker resolves the references in the GOT for each program.  Since
the code references the GOT, it doesn't need to change, so the
code is shareable between processes.  The Sun C compiler provides 
the '-pic' option, which produces such code.  As far as we can 
tell, this is unsupported in 'gcc'.  Does GNU provide any tools
for creating PIC, or shared libraries?  If so, please direct us
to the appropriate sources.  Below is a small example illustrating 
the difference between 'gcc' and 'cc -pic' for a simple program.
Thanks very much!

-------------------------seterr.c---------------------
#include <errno.h>

main()
{
     errno = EACCES;
}
---------------- 'gcc -S' output ---------------------
gcc_compiled.:
.text
 .align 4
.global _main
 .proc 1
_main:
 !#PROLOGUE# 0
 save %sp,-80,%sp
 !#PROLOGUE# 1
 mov 13,%o0
 sethi %hi(_errno),%g1
 st    %o0,[%g1+%lo(_errno)]
L1:
 ret
 restore
------------- 'cc -pic' output -------------------------
LL0:
 .seg      "data"
 .seg      "text"
 .proc 04
 .global _main
_main:
 !#PROLOGUE# 0
 sethi       %hi(LF13),%g1
 add     %g1,%lo(LF13),%g1
 save      %sp,%g1,%sp
1:
 call    2f
        sethi      %hi(__GLOBAL_OFFSET_TABLE_ - (1b-.)), %l7
2:
 or    %l7, %lo(__GLOBAL_OFFSET_TABLE_ - (1b-.)), %l7
 add     %l7, %o7, %l7
 !#PROLOGUE# 1
 ld    [%l7+_errno],%o0
 mov     0xd,%o1
 st    %o1,[%o0]
LE13:
 ret
 restore
       LF13 = -64
 LP13 = 64
 LST13 = 64
 LT13 = 64
 .seg      "data"
----------------------------------------------------------------


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| Kiran Shah                | IDD Information Services            |
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