HP SunSoft Pascal 4.0 Manuale Utente Scaricare il pdf (Pagina 48)

24 Pascal 4.0 User’s Guide

–a

The –a option is the old style of basic block proﬁling for tcov. See

-xprofile=tcov for information on the new style of proﬁling and the

tcov(1) man page for more details. Also see the manual, Proﬁling Tools.

The –a option inserts code to count how many times each basic block is

executed. It also calls a runtime recording mechanism that creates a .d ﬁle for

every .p ﬁle at normal termination. The .d ﬁle accumulates execution data for

the corresponding source ﬁle. The tcov(1) utility can then be run on the

source ﬁle to generate statistics about the program.

If set at compile-time, the TCOVDIR environment variable speciﬁes the

directory of where the .d ﬁles are located. If this variable is not set, then the

.d ﬁles remain in the same directory as the .f ﬁles.

The -xprofile=tcov and the -a options are compatible in a single

executable. That is, you can link a program that contains some ﬁles which

have been compiled with -xprofile=tcov, and others with -a. You cannot

compile a single ﬁle with both options.

–Bbinding

The –B option speciﬁes whether libraries for linking are static (not shared,

indicated with -Bstatic), or dynamic (shared, indicated with -Bdynamic).

Link editing is the set of operations necessary to build an executable program

from one or more object ﬁles. Static linking indicates that the results of these

operations are saved to a ﬁle. Dynamic linking refers to these operations when

performed at runtime. The executable that results from dynamic linking

appears in the running process, but is not saved to a ﬁle.

–b

It is inefﬁcient for Pascal to send each character to a terminal as it generates its

output. It is even less efﬁcient if the output is the input of another program,

such as the line printer daemon, lpr(1).

To gain efﬁciency, Pascal buffers output characters; it saves the characters in

memory until the buffer is full and then outputs the entire buffer in one system

interaction. By default, Pascal output is line-buffered.

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HP SunSoft Pascal 4.0 Manuale Utente Pagina 48