Re: [gentoo-user] mplayer compilation

[Daniel Iliev <danny@ilievnet.com>]

Hans-Werner Hilse wrote:
> Hi,
>
> On Mon, 20 Nov 2006 15:52:13 +0100
> Bo Ørsted Andresen <bo.andresen@zlin.dk> wrote:
>
>   
>> Well, actually the mplayer ebuild don't care about your CFLAGS unless you 
>> enable the custom-cflags USE flag. Otherwise march is entirely unset.
>>     
>
> No, the mplayer configure script would autodetect optimization and set
> the result as -march and -mcpu (and will also enable -O4).
>
> All such checking would of course be runtime only and your statement
> about march would be true if the cpudetection USE flag is set.
>
> Don't ask me about what happens when both custom-cflags and
> cpudetection are enabled... :-)
>
> -hwh
>
>   

I don't think there is such an option for gcc "-O4". AFAIK the shorthand
optimization options are -O, -O0, -O1, -O2, -O3 and -Os" At least the
man page reads:


Optimization Options
    -falign-functions=n -falign-jumps=n -falign-labels=n -falign-loops=n
    -fbounds-check -fmudflap -fmudflapth -fmudflapir
    -fbranch-probabilities -fprofile-values -fvpt
    -fbranch-target-load-optimize -fbranch-target-load-optimize2
    -fbtr-bb-exclusive -fcaller-saves -fcprop-registers
    -fcse-follow-jumps -fcse-skip-blocks -fcx-limited-range
    -fdata-sections -fdelayed-branch -fdelete-null-pointer-checks
    -fearly-inlining -fexpensive-optimizations -ffast-math -ffloat-store
    -fforce-addr -ffunction-sections -fgcse -fgcse-lm -fgcse-sm
    -fgcse-las -fgcse-after-reload -floop-optimize -fcrossjumping
    -fif-conversion -fif-conversion2 -finline-functions
    -finline-functions-called-once -finline-limit=n
    -fkeep-inline-functions -fkeep-static-consts -fmerge-constants
    -fmerge-all-constants -fmodulo-sched -fno-branch-count-reg
    -fno-default-inline -fno-defer-pop -floop-optimize2
    -fmove-loop-invariants -fno-function-cse
    -fno-guess-branch-probability -fno-inline -fno-math-errno
    -fno-peephole -fno-peephole2 -funsafe-math-optimizations
    -funsafe-loop-optimizations -ffinite-math-only -fno-trapping-math
    -fno-zero-initialized-in-bss -fomit-frame-pointer
    -foptimize-register-move -foptimize-sibling-calls
    -fprefetch-loop-arrays -fprofile-generate -fprofile-use -fregmove
    -frename-registers -freorder-blocks -freorder-blocks-and-partition
    -freorder-functions -frerun-cse-after-loop -frerun-loop-opt
    -frounding-math -fschedule-insns -fschedule-insns2
    -fno-sched-interblock -fno-sched-spec -fsched-spec-load
    -fsched-spec-load-dangerous -fsched-stalled-insns=n
    -fsched-stalled-insns-dep=n -fsched2-use-superblocks
    -fsched2-use-traces -freschedule-modulo-scheduled-loops
    -fsignaling-nans -fsingle-precision-constant -fstack-protector
    -fstack-protector-all -fstrength-reduce -fstrict-aliasing -ftracer
    -fthread-jumps -funroll-all-loops -funroll-loops -fpeel-loops
    -fsplit-ivs-in-unroller -funswitch-loops
    -fvariable-expansion-in-unroller -ftree-pre -ftree-ccp -ftree-dce
    -ftree-loop-optimize -ftree-loop-linear -ftree-loop-im
    -ftree-loop-ivcanon -fivopts -ftree-dominator-opts -ftree-dse
    -ftree-copyrename -ftree-sink -ftree-ch -ftree-sra -ftree-ter
    -ftree-lrs -ftree-fre -ftree-vectorize -ftree-vect-loop-version
    -ftree-salias -fweb -ftree-copy-prop -ftree-store-ccp
    -ftree-store-copy-prop -fwhole-program --param name=value -O -O0 -O1
    -O2 -O3 -Os 


-- 
Best regards,
Daniel


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