(g77.info) Run-time Environment Limits

 
 Run-time Environment Limits
 ===========================
 
    As a portable Fortran implementation, `g77' offers its users direct
 access to, and otherwise depends upon, the underlying facilities of the
 system used to build `g77', the system on which `g77' itself is used to
 compile programs, and the system on which the `g77'-compiled program is
 actually run.  (For most users, the three systems are of the same
 type--combination of operating environment and hardware--often the same
 physical system.)
 
    The run-time environment for a particular system inevitably imposes
 some limits on a program's use of various system facilities.  These
 limits vary from system to system.
 
    Even when such limits might be well beyond the possibility of being
 encountered on a particular system, the `g77' run-time environment has
 certain built-in limits, usually, but not always, stemming from
 intrinsics with inherently limited interfaces.
 
    Currently, the `g77' run-time environment does not generally offer a
 less-limiting environment by augmenting the underlying system's own
 environment.
 
    Therefore, code written in the GNU Fortran language, while
 syntactically and semantically portable, might nevertheless make
 non-portable assumptions about the run-time environment--assumptions
 that prove to be false for some particular environments.
 
    The GNU Fortran language, the `g77' compiler and run-time
 environment, and the `g77' documentation do not yet offer comprehensive
 portable work-arounds for such limits, though programmers should be
 able to find their own in specific instances.
 
    Not all of the limitations are described in this document.  Some of
 the known limitations include:
(g77.info) Run-time Environment Limits

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