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

Compiling and linking
Compiling with the f90 command
Chapter 2 55
+trigdacc
The compiler will use more accurate cosd, sind, and tand intrinsics, than the
standard ones. While the standard ones have some accuracy problems with the boundary
cases (i.e., cosd(90) needs to be 0.0), these new intrinsics get these cases right.
NOTE +trigdacc option is not valid on HP Itanium-based systems.
+[no]ttybuf
+ttybuf controls tty buffering, using buffered output. +nottybuf uses unbuffered
output. The default is buffered output (+ttybuf). The +ttybuf option forces
buffered output even on systems whose default is unbuffered output.
The +[no]ttybuf option is recognized only when the main program is a Fortran
program. If the main program is written in another language, use the TTYUNBUF
environment variable (see f90(1)).
The +nottybuf option is incompatible with certain BSD 3F library routines. When it
is used on the same command line with the +U77 option, the compiler will warn of a
potential tty buffering conflict.
-Uname
-U undefines or removes any initial definition of name in the C preprocessor (cpp).
See the cpp(1) in the
HP-UX Reference for details.
+[no]U77
+U77 option invokes support for the BSD 3F library, libU77, which provides an HP
Fortran interface to some of the libc system routines. To call routines in this library,
you must compile and link with +U77. For information about these routines, see the HP
Fortran Programmer’s Reference.
If +noU77 (the default) is specified or if +U77 is not specified, the compiler treats
libU77 routine names as ordinary external names with no name mapping. If the name
is not present in one of the libraries linked to, the linker emits an error message because
s Start-up file crt0.o, gcrt0.o, mcrt0.o
Table 2-7 Values for the -t option x subprocesses (Continued)
Value Subprocess Standard name