HP SunSoft Pascal 4.0 Manual do Utilizador descarregar pdf (Página 111)

100

101

Separate Compilation 87

Sharing Declarations in Multiple Units

Using extern and external directives for procedure and function

declarations, you can optionally specify the source language of a separately

compiled procedure or function. For example, extern fortran directs the

compiler to generate calling sequences compatible with the FORTRAN

compiler from SunSoft

. Then, external c directs the compiler to generate

calling sequences compatible with SunSoft C compiler.

The module unit, ext_mod.p module ext_mod;

define

global, proc;

%include "extern.h";

procedure proc;

begin

writeln('From PROC : ',global);

global := global + 1;

end; { proc }

Theinclude ﬁle, extern.h var

global : extern integer;

procedure proc; extern;

The commands to compile and

execute ext_prog.p and

ext_mod.p

hostname% pc -xl ext_prog.p ext_mod.p

ext_prog.p:

ext_mod.p:

Linking:

hostname% a.out

From MAIN, before PROC: 1

From PROC : 1

From MAIN, after PROC: 2

1 2 ... 106 107 108 109 110 111 112 113 114 115 116 ... 332 333

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