-@c Copyright (C) 2004, 2005, 2006, 2007, 2008
+@c Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009
@c Free Software Foundation, Inc.
@c This is part of the GNU Fortran manual.
@c For copying conditions, see the file gfortran.texi.
@ignore
@c man begin COPYRIGHT
-Copyright @copyright{} 2004, 2005, 2006, 2007, 2008
+Copyright @copyright{} 2004, 2005, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
@item Code Generation Options
@xref{Code Gen Options,,Options for code generation conventions}.
@gccoptlist{-fno-automatic -ff2c -fno-underscoring @gol
--fsecond-underscore @gol
+-fwhole-file -fsecond-underscore @gol
-fbounds-check -fcheck-array-temporaries -fmax-array-constructor =@var{n} @gol
+-fcheck=@var{<all|array-temps|bounds|do|recursion>}
-fmax-stack-var-size=@var{n} @gol
-fpack-derived -frepack-arrays -fshort-enums -fexternal-blas @gol
-fblas-matmul-limit=@var{n} -frecursive -finit-local-zero @gol
--finit-integer=@var{n} -finit-real=@var{<zero|inf|-inf|nan>} @gol
+-finit-integer=@var{n} -finit-real=@var{<zero|inf|-inf|nan|snan>} @gol
-finit-logical=@var{<true|false>} -finit-character=@var{n} -fno-align-commons}
@end table
@cindex $
@cindex symbol names
@cindex character set
-Allow @samp{$} as a valid character in a symbol name.
+Allow @samp{$} as a valid non-first character in a symbol name. Symbols
+that start with @samp{$} are rejected since it is unclear which rules to
+apply to implicit typing as different vendors implement different rules.
+Using @samp{$} in @code{IMPLICIT} statements is also rejected.
@item -fbackslash
@opindex @code{backslash}
prevent accidental linking between procedures with incompatible
interfaces.
+@item -fwhole-file
+@opindex @code{fwhole-file}
+By default, GNU Fortran parses, resolves and translates each procedure
+in a file separately. Using this option modifies this such that the
+whole file is parsed and placed in a single front-end tree. During
+resolution, in addition to all the usual checks and fixups, references
+to external procedures that are in the same file effect resolution of
+that procedure, if not already done, and a check of the interfaces. The
+dependences are resolved by changing the order in which the file is
+translated into the backend tree. Thus, a procedure that is referenced
+is translated before the reference and the duplication of backend tree
+declarations eliminated.
+
@item -fsecond-underscore
@opindex @code{fsecond-underscore}
@cindex underscore
for compatibility with @command{g77} and @command{f2c}, and is implied
by use of the @option{-ff2c} option.
-@item -fbounds-check
-@opindex @code{fbounds-check}
+@item -fcheck=@var{<keyword>}
+@opindex @code{fcheck}
@cindex array, bounds checking
@cindex bounds checking
@cindex range checking
@cindex subscript checking
@cindex checking subscripts
+@cindex run-time checking
+@cindex checking array temporaries
+
+Enable the generation of run-time checks; the argument shall be
+a comma-delimited list of the following keywords.
+
+@table @asis
+@item @samp{all}
+Enable all run-time test of @option{-fcheck}.
+
+@item @samp{array-temps}
+Warns at run time when for passing an actual argument a temporary array
+had to be generated. The information generated by this warning is
+sometimes useful in optimization, in order to avoid such temporaries.
+
+Note: The warning is only printed once per location.
+
+@item @samp{bounds}
Enable generation of run-time checks for array subscripts
and against the declared minimum and maximum values. It also
checks array indices for assumed and deferred
lengths are equal for character array constructors without an explicit
typespec.
-Some checks require that @option{-fbounds-check} is set for
+Some checks require that @option{-fcheck=bounds} is set for
the compilation of the main program.
Note: In the future this may also include other forms of checking, e.g.,
checking substring references.
+@item @samp{do}
+Enable generation of run-time checks for invalid modification of loop
+iteration variables.
-@item fcheck-array-temporaries
-@opindex @code{fcheck-array-temporaries}
-@cindex checking array temporaries
-Warns at run time when for passing an actual argument a temporary array
-had to be generated. The information generated by this warning is
-sometimes useful in optimization, in order to avoid such temporaries.
+@item @samp{recursion}
+Enable generation of run-time checks for recursively called subroutines and
+functions which are not marked as recursive. See also @option{-frecursive}.
+@end table
-Note: The warning is only printed once per location.
+@item -fbounds-check
+@opindex @code{fbounds-check}
+@c Note: This option is also referred in gcc's manpage
+Deprecated alias for @option{-fcheck=bounds}.
+
+@item -fcheck-array-temporaries
+@opindex @code{fcheck-array-temporaries}
+Deprecated alias for @option{-fcheck=array-temps}.
@item -fmax-array-constructor=@var{n}
@opindex @code{fmax-array-constructor}
@item -finit-local-zero
@item -finit-integer=@var{n}
-@item -finit-real=@var{<zero|inf|-inf|nan>}
+@item -finit-real=@var{<zero|inf|-inf|nan|snan>}
@item -finit-logical=@var{<true|false>}
@item -finit-character=@var{n}
@opindex @code{finit-local-zero}
@code{CHARACTER} variables to a string of null bytes. Finer-grained
initialization options are provided by the
@option{-finit-integer=@var{n}},
-@option{-finit-real=@var{<zero|inf|-inf|nan>}} (which also initializes
+@option{-finit-real=@var{<zero|inf|-inf|nan|snan>}} (which also initializes
the real and imaginary parts of local @code{COMPLEX} variables),
@option{-finit-logical=@var{<true|false>}}, and
@option{-finit-character=@var{n}} (where @var{n} is an ASCII character
future releases).
Note that the @option{-finit-real=nan} option initializes @code{REAL}
-and @code{COMPLEX} variables with a quiet NaN.
+and @code{COMPLEX} variables with a quiet NaN. For a signalling NaN
+use @option{-finit-real=snan}; note, however, that compile-time
+optimizations may convert them into quiet NaN and that trapping
+needs to be enabled (e.g. via @option{-ffpe-trap}).
@item -falign-commons
@opindex @code{falign-commons}
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