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Re: Null pointer dereference and side effects

Hi Archie,

You could try disabling or reviewing the optimizations one at a time, until you find a likely culprit...

> gcc -fverbose-asm -save-temps -O2 -W -Wall crash.c
> cat crash.s
        .file   "crash.c"
! GNU C version 3.2 (sparc-sun-solaris2.8)
!       compiled by GNU C version 3.2.
! options passed:  -fpreprocessed -O2 -W -Wall -fverbose-asm
! options enabled:  -fdefer-pop -fomit-frame-pointer
! -foptimize-sibling-calls -fcse-follow-jumps -fcse-skip-blocks
! -fexpensive-optimizations -fthread-jumps -fstrength-reduce -fpeephole
! -fforce-mem -ffunction-cse -fkeep-static-consts -fcaller-saves
! -fpcc-struct-return -fdelayed-branch -fgcse -fgcse-lm -fgcse-sm
! -frerun-cse-after-loop -frerun-loop-opt -fdelete-null-pointer-checks
! -fschedule-insns -fschedule-insns2 -fsched-interblock -fsched-spec
! -fbranch-count-reg -freorder-blocks -fcprop-registers -fcommon
! -fverbose-asm -fgnu-linker -fregmove -foptimize-register-move
! -fargument-alias -fstrict-aliasing -fmerge-constants -fident -fpeephole2
! -fguess-branch-probability -fmath-errno -ftrapping-math

        .section        ".text"
        .align 4
        .global main
        .type   main,#function
        .proc   04
main:
        !#PROLOGUE# 0
        !#PROLOGUE# 1
        retl
        mov     1, %o0
.LLfe1:
        .size   main,.LLfe1-main
        .ident  "GCC: (GNU) 3.2"

HTH,
--Eljay

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