Features Release History

B

This Appendix lists the new and changed features in this and previous release of f77 and f90:

New Features and Behavior Changes in Fortran 77 (`f77`)

This section lists the new features and behavior changes specific to f77.

Features in `f77` 4.2 that are New Since 4.0

f77 4.2 includes the following features that are new or changed since the 4.0 release:

New options:
Changed options:

Features in `f77` 4.0 that are New Since 3.0/3.0.1

f77 4.0 includes the following features that are new or changed since 3.0/3.0.1:

The DOSERIAL and DOSERIAL* parallel directives have been added, and the DOALL directive expanded.
A directive for unrolling loops has been added.
The -Idir option now also affects the f77 INCLUDE statement, not only the preprocessor #include directive.
The Incremental Linker is available. It provides faster linking and speeds up development.
The -oldstruct command-line option has been deleted.
The following new synonyms have been added: -xautopar, -xdepend, -xexplicitpar, -xloopinfo, -xparallel, -xreduction, and
-xvpara.
The -stackvar restrictions EQUIVALANCE, NAMELIST, STRUCTURE, and RECORD have been removed.

New options have been added (and some changed):

Table B-1 New Features in `f77` 4.0 Since 3.0/3.0.1
`-arg=local`	Pass by value result.
-copyargs	Allow assignment to constant arguments.
`-dbl`	Double the default size for integers, reals, and so forth.
`-ext_names=`e	Make external names with or without underscores.
`-fns`	Turn on SPARC non-standard floating-point mode (SPARC, 2.x).
`-fround=`r	Set the IEEE rounding mode in effect at startup (SPARC, 2.x).
`-fsimple`[`=`n]	Allow levels of simple floating-point model.
`-ftrap=`t	Set the IEEE trapping mode in effect at startup (SPARC, 2.x).
`-mp=`x	Use either Sun-style or Cray-style MP directives (SPARC, 2.x).
`-O5`	Attempt the highest level of optimization.
`-pad=`p	Pad local variables or common blocks
`-vax=`v	Specify a choice of VMS features to use.
`-xarch=`a	Limit the set of instructions the compiler may use (SPARC, 2.x).
`-xcache`=c	Define the cache properties for use by the optimizer (SPARC, 2.x).
`-xchip=`c	Specify the target processor for use by the optimizer (SPARC, 2.x).
`-xhelp=`h	Show help information for `README` file or for options (flags).
`-xildoff`	Turn off the Incremental Linker (SPARC, 2.x).
`-xildon`	Turn on the Incremental Linker (SPARC, 2.x).
`-xprofile=`p	Collect data for a profile or use a profile to optimize (SPARC, 2.x).
`-xregs=`r	Specify the usage of registers for the generated code (SPARC, 2.x).
`-xsafe=mem`	Allow compiler to assume no memory-based traps (SPARC, 2.x).
`-xspace`	Do no optimizations that increase the code size (SPARC, 2.x).
`-xtarget=`t	Specify target system for instruction set (SPARC, 2.x).
`-ztext`	Do not make the library if relocations remain.