HP Fortran Programmer's Guide (B3908-90031; September 2011)

Compiling and linking
Linking HP Fortran programs
Chapter 2 79
/opt/fortran90/lib:/usr/lib:/opt/langtools/lib
8 /usr/ccs/bin/ld -x /opt/langtools/lib/crt0.o hello.o
/opt/fortran90/lib/libF90.a -lcl -lc -lisamstub
Line 1 is the f90 command line.
Line 2 is the information f90 passes to the compiler, including the full pathname of the compiler, the
name of the source file (hello.f90), and the internal names of the option settings as determined by
the defaults and the f90 command line.
Lines 3 - 6 show the progress of the compilation; line 6 indicates that the compilation was successful.
Line 7 displays the value to which f90 has defined the LPATH environment variable. If you use the ld
command to link hello.f90, you must define LPATH on the command line before invoking the linker.
See “LPATH environment variable” on page 98.
Line 8 is the command line that f90 passes to the linker (ld). If you use the ld command to link
hello.f90, the command line should be similar to the one shown here.
As noted in the comments on lines 7 and 8, compiling and linking hello.f90 successfully using both the
f90 and ld commands requires three command lines:
$ f90 -c hello.f90 # compile
$ export LPATH=/opt/fortran90/lib/pa1.1:/usr/lib/pa1.1:\
/opt/fortran90/lib:/usr/lib:/opt/langtools/lib # set LPATH
$ ld -x /opt/langtools/lib/crt0.o hello.o \
/opt/fortran90/lib/libF90.a -lcl -lc -lisamstub # link
The command line to set LPATH in the csh is:
$ setenv LPATH /opt/fortran90/lib/pa1.1:/usr/lib/pa1.1:\
/opt/fortran90/lib:/usr/lib:/opt/langtools/lib # set LPATH
For more information about the linker, see the ld(1) man page. For a list of f90 options that you can use to
control the linker, see Table on page 14. To pass linker options from the f90 command line to the linker, use
the -Wl option (for an example, see “Linking to shared libraries” on page 83). The HP Fortran
Programmer’s Reference, fully describes the -Wl option.
Linking to libraries
When you use the f90 command to create an executable program, the linker looks in the libraries listed in
Table 2-14 to resolve references. By default, the linker uses the shared libraries, if available. For information
about shared libraries, see “Linking to shared libraries” on page 83.