LPCxpresso: Potize s optimalizaci

[balu]

takato diskusia uz zacina zavanat nabozenskym fanatizmom. Aku to knihu 
citujes??


On 27/07/2016 23:22, Jan Waclawek wrote:
> Potiaz s normou je ta, ze jedna vec je roztahana krizom-krazom po viacerych
> miestach (tak ako to vlastne byva aj v netrivialnych neucebnicovych
> programoch :-). Preto mi aj chvilu trvalo, kym som to nasiel (budem sa
> drzat C99 bo C11 nemam dobre nastudovane priznavam bez mucenia).
>
> Takze citovali ste najprv 6.2.2#5
>
> If the declaration of an identifier for an object has file scope and no
> storage-class specifier, its linkage is external.
>
> Inaksie povedane, ak je v subore *deklaracia* (co moze byt aj definiciou
> ale nemusi) premennej (co je zhruba object) a nie je k nemu pripisane
> jedno z "typedef, extern, static, auto, register", tak sa to meno objavi v
> prelozenom binarnom objekte, ci uz so znackou ze k nemu treba alokovat
> miesto alebo nie.
>
> Potom ste citovali 6.2.2#2
>
> In the set of translation units and libraries that constitutes an entire
> program, each declaration of a particular identifier with external linkage
> denotes the same object or
> function.
>
> Inaksie povedane, ak linker zacne linkovat, tak vsetky tieto mena, aj ked
> pochadzaju z roznych suborov, maju ukazovat na tu istu adresu. Potial
> dobre.
>
> Lenze je tu este aj 6.9#3:
>
> An external definition is an external declaration that is also a definition
> of a function (other than an inline definition) or an object. If an
> identifier declared with external
> linkage is used in an expression (other than as part of the operand of a
> sizeof operator whose result is an integer constant), somewhere in the
> entire program there shall be
> exactly one external definition for the identifier; otherwise, there shall
> be no more than one. 140)
>
> Nie je to v constraints a je tam slovo shall, znamena to podla 4#2, ze ak
> sa to porusi, spravanie je nedefinovane.
>
> Nedefinovane spravanie pochopitelne zahrna aj "funguje podla ocakavania
> (ale neda sa na to spolahnut)".
>
> wek
>
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