Technical data

Compiling and Linking

See the section called “FILES” in the f77(1) manual page for a complete list

of the ﬁles used by the Fortran driver. Also refer to the ld(1) manual page for

information on specifying the –l option.

Specifying Link Libraries

You must explicitly load any required run-time libraries when compiling

multilanguage programs. For example, when you link a program written in

Fortran and some procedures written in Pascal, you must explicitly load the

Pascal library libp.a and the math library libm.a with the options –lp and –lm

(abbreviations for the libraries libp.a and libm.a). This procedure is

demonstrated in the next example.

% f77 main.o more.o rest.o -lp -lm

To ﬁnd the Pascal library, the link editor replaces the –l with lib and adds an

.a after p. Then, it searches the /lib, /usr/lib, and /usr/local/lib directories for

this library. For a list of the libraries that a language uses, see the associated

driver manual page, cc(1), f77(1), or pc(1).

You may need to specify libraries when you use IRIX system packages that

are not part of a particular language. Most of the manual pages for these

packages list the required libraries. For example, the getwd(3B) subroutine

requires the BSD compatibility library libbsd.a. This library is speciﬁed as

follows:

% f77 main.o more.o rest.o -lbsd

To specify a library created with the archiver, type in the pathname of the

library as shown below.

% f77 main.o more.o rest.o libfft.a

Note: The link editor searches libraries in the order you specify. Therefore,

if you have a library (for example, libfft.a) that uses data or procedures from

–lp, you must specify libfft.a ﬁrst.