@c %**start of header
@setfilename g77.info
-@set last-update 1999-05-06
+@set last-update 1999-05-10
@set copyrights-g77 1995-1999
@include root.texi
network connections, and so on, which are invaluable to volunteers.
(Similarly, hiring Cygnus Support can help a project like GNU
Fortran---Cygnus has been a long-time donor of equipment usage to the author
-of GNU Fortran, and this too has been invaluable---@xref{Contributors}.)
+of GNU Fortran, and this too has been invaluable---see @ref{Contributors}.)
Currently, the only way to directly fund the author of GNU Fortran
in his work on that project is to hire him for the work you want
@cindex #
@cindex preprocessor
-@code{cpp} output-style @code{#} directives @xref{C Preprocessor
-Output,,, cpp, The C Preprocessor}, are recognized by the compiler even
+@code{cpp} output-style @code{#} directives
+(@pxref{C Preprocessor Output,,, cpp, The C Preprocessor})
+are recognized by the compiler even
when the preprocessor isn't run on the input (as it is when compiling
@samp{.F} files). (Note the distinction between these @code{cpp}
@code{#} @emph{output} directives and @code{#line} @emph{input}
For convenience this section collects a list (probably incomplete) of
the Fortran 90 features supported by the GNU Fortran language, even if
they are documented elsewhere.
-@c makeinfo 1.68 objects to the nested parens
-@ifnotinfo
-@xref{Characters Lines Sequence,,{Characters, Lines, and Execution Sequence}},
-@end ifnotinfo
-@ifinfo
-@xref{Characters Lines Sequence},
-@end ifinfo
+@xref{Characters Lines Sequence,,@asis{Characters, Lines, and Execution Sequence}},
for information on additional fixed source form lexical issues.
@cindex @samp{-ffree-form}
Further, the free source form is supported through the
permitted. Character constants may be enclosed in double quotes
(@code{"}) as well as single quotes. @xref{Character Type}.
@item Construct names
-(Symbolic tags on blocks.) @xref{Construct Names }.
+(Symbolic tags on blocks.) @xref{Construct Names}.
@item @code{CYCLE} and @code{EXIT}
@xref{CYCLE and EXIT,,The @code{CYCLE} and @code{EXIT} Statements}.
@item @code{DOUBLE COMPLEX}
-@xref{DOUBLE COMPLEX,,@code{DOUBLE COMPLEX} Statement
-}.
+@xref{DOUBLE COMPLEX,,@code{DOUBLE COMPLEX} Statement}.
@item @code{DO WHILE}
@xref{DO WHILE}.
@item @code{END} decoration
@code{>=} may be used instead of @code{.LT.}, @code{.LE.}, @code{.EQ.},
@code{.NE.}, @code{.GT.} and @code{.GE.} respectively.
@item @code{SELECT CASE}
-Not fully implemented. @xref{SELECT CASE on CHARACTER Type,,
-@code{SELECT CASE} on @code{CHARACTER} Type}.
+Not fully implemented.
+@xref{SELECT CASE on CHARACTER Type,, @code{SELECT CASE} on @code{CHARACTER} Type}.
@item Specification statements
A limited subset of the Fortran 90 syntax and semantics for variable
declarations is supported, including @code{KIND}. @xref{Kind Notation}.
If your program depends on exact IEEE 754 floating-point handling it may
help on some systems---specifically x86 or m68k hardware---to use
the @samp{-ffloat-store} option or to reset the precision flag on the
-floating-point unit @xref{Optimize Options}.
+floating-point unit.
+@xref{Optimize Options}.
However, it might be better simply to put the FPU into double precision
mode and not take the performance hit of @samp{-ffloat-store}. On x86
and m68k GNU systems you can do this with a technique similar to that
-for turning on floating-point exceptions @xref{Floating-point Exception
-Handling}. The control word could be set to double precision by
+for turning on floating-point exceptions
+(@pxref{Floating-point Exception Handling}).
+The control word could be set to double precision by
replacing the @code{__setfpucw} call with one like this:
@smallexample
__setfpucw ((_FPU_DEFAULT & ~_FPU_EXTENDED) | _FPU_DOUBLE);
maths library, but we have no evidence of it causing trouble.)
Some targets (such as the Alpha) may need special options for full IEEE
-conformance @xref{Submodel Options,,Hardware Models and
-Configurations,gcc,Using and Porting GNU CC}.
+conformance.
+@xref{Submodel Options,,Hardware Models and Configurations,gcc,Using and Porting GNU CC}.
@node Inconsistent Calling Sequences
@subsection Inconsistent Calling Sequences
@cindex ix86 FPU stack
@cindex x86 FPU stack
Code containing inconsistent calling sequences in the same file is
-normally rejected @xref{GLOBALS}. (Use, say, @code{ftnchek} to ensure
-consistency across source files
-@c makeinfo 1.68 objects to the nested parens
-@ifinfo
-@xref{f2c Skeletons and Prototypes}.)
-@end ifinfo
-@ifnotinfo
+normally rejected---see @ref{GLOBALS}.
+(Use, say, @code{ftnchek} to ensure
+consistency across source files.
@xref{f2c Skeletons and Prototypes,,
-{Generating Skeletons and Prototypes with @code{f2c}}}.)
-@end ifnotinfo
+Generating Skeletons and Prototypes with @code{f2c}}.)
Mysterious errors, which may appear to be code generation problems, can
appear specifically on the x86 architecture with some such
directly from the @code{gcc} manual, with minor modifications
to tailor it to users of @code{g77}.
Anytime a bug seems to have more to do with the @code{gcc}
-portion of @code{g77},
-@xref{Trouble,,Known Causes of Trouble with GNU CC,
+portion of @code{g77}, see
+@ref{Trouble,,Known Causes of Trouble with GNU CC,
gcc,Using and Porting GNU CC}.)
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