Re^2: Lost Library...

[Alexios Chouchoulas]

On Wed, 8 Oct 1997, Christos Ricudis wrote:

> (to lew ayto giati yparxei tool poy metatrepei ELF .a libraries se dynamically
> linked ones) 

  Ontws yparxei, alla mporeis na to kaneis kai me to xeri, bgazontas ta .o
objects apo to .a archive me to ar(1) kai meta xrhsimopoiwntas ton gcc se
linker mode me ta katallhla options (ok, mporeis na xrhsimopoihseis kai ton
ld(1) apeftheias alla den thymamai pws).

px (estw bibliothiki libpapaki.a ekdoshs 1.xx):

$ ar x libpapaki.a    (den orkizomai oti einai ki etsi)
$ gcc -shared -Wl,-soname,libpapaki.so.1 -o libpapaki.so.1 ena.o dyo.o ...

  One catch: Ola ta .o arxeia prepei na exoun ginei compile me flag -fPIC
sthn klhsh tou compiler. Afto ginetai epeidh to ELF apaitei apokleistikothta
se enan register (gia to base address ths bibliothikis, isws, den kserw
polla apo ELF) kai alliws aploustata DEN tha doulepsei h bibliothikh.

(Dystyxws to ELF sxediasthke gia Sparc, opote den exei kai pollh katanohsh
gia to oti h x86 arxitektonikh den exei arketa registers wste na ta xarizei
apo dv ki apo kei.)

  Gi'afto kai oloi eixan pei oti to ELF tha einai pio argo apo to a.out otan
prwtobghke to ELF gia to Linux. Einai ligo pio argo alla aksizei ton kopo.
*DEN* theleis na ksereis poso pio periploko einai na ftiakseis a.out shared
object. To exw kanei kai DEN thelw na to thymamai. Mou phre ena apogevma na
sthsw ola ta aparaithta arxeiakia, ypoarxeiakia, Makefiles kai gcc options
kai meta kathe fora pou prostheta ena symbolo sthn bibliothiki eprepe na
kanw ta misa apo thn arxh. Mpliax. Toulaxiston sto ELF afta ginontai ola
aftomata.

Alexios Chouchoulas         '88    ,88'   ,88'   http://www.vennea.demon.co.uk 
The Unpronounceable One    ,o88oooo88ooooo88oo,     alexios at vennea.demon.co.uk

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