HP Fortran Programmer's Guide (March 2010)

Compiling and linking
Linking HP Fortran programs
Chapter 284
When the linker finds a reference in your program to a name that is not defined in the
program (for example, the DOT_PRODUCT intrinsic), it looks to resolve it in the default libraries.
If it cannot find the name in the default libraries, the link will fail unless the command line
specifies additional, nondefault libraries. This section discusses how to link to nondefault
libraries (including shared libraries) and library search rules.
Linking to nondefault libraries
The -l option enables you to specify other libraries for linking, in addition to the default
libraries listed in Table 2-14. The syntax for this option is:
-lx
where x is a sequence of characters that completes a library name of the form /lib/libx.a or
/usr/lib/libx.a. For example, -lm specifies the math library, /usr/lib/libm.a. (The .a
extension indicates an archive library. You can also link to shared libraries, which have
the .sl extension; see “Linking to shared libraries” on page 86.)
The -l option is order-sensitive: when the linker finds a reference in an object file that it
cannot resolve in the default libraries, it searches the libraries (if any) specified after the file
on the command line. For example, the following command line tells the linker to look for
unresolved references in the math library as well as the default libraries:
$ f90 prog.f90 -lm
You can also link a library to your program by specifying its name after the name of the source
file that references it, as follows:
$ f90 prog.f90 /usr/lib/libm.a
This form of the command line is useful for linking libraries that do not conform to the
naming convention required by the -l option or that reside in a directory other than /lib or
/usr/lib. As with the -l option, the library name must follow the name of the source file that
references it. For example, the following command line links prog.f90 with the library
my_routines, both of which reside in the current working directory:
$ f90 prog.f90 my_routines
/usr/lib/hpux[32|64]/libc.so Shared library for intrinsic procedures and
system routines
/opt/fortran90/lib/hpux[32|64]/li
bF2003.a
Archive library for Fortran 2003 standard
features
Table 2-14 Libraries linked by default on Itanium (Continued)
Library Contents