230 lines
5.3 KiB
Text
230 lines
5.3 KiB
Text
.TH FM2 1
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.SH NAME
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fm2 \- fast CC compatible Modula-2 compiler
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.SH SYNOPSIS
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.B fm2
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[
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.B \-c
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]
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[
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.B \-O
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]
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[
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.B \-v
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]
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[
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.B \-vn
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]
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[ \fB\-D\fIname\fR ]
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[ \fB\-D\fIname\fB=\fIdef\fR ]
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[
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.BI \-I pathname
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]
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[
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.BI \-w classes
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]
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[
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.BI \-W classes
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]
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[
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.B \-L
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]
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[
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.B \-o
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.I outfile
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]
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[
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.B \-R
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]
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[
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.B \-A
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]
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[
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.B \-3
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]
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[
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.B \-U
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]
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[
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.B \-e
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]
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[
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.BI \-U name
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]
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[
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.BI -M compiler
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]
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.I sourcefile ...
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.SH DESCRIPTION
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.LP
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.I fm2
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is a fast
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.B Modula-2
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compiler. It translates
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.B Modula-2
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programs
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into cc(1)-compatible relocatable object modules, and does so in one pass.
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Then, if the \fB\-c\fP flag is not given,
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.I fm2
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offers the object modules to a link-editor,
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to create an executable binary.
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.LP
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.I Fm2
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accepts several types of filename arguments. Files with
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names ending in
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.B .mod
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are taken to be
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.B Modula-2
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source programs.
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They are compiled, and the resulting object module is placed in the current
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directory.
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The object module is named after its source file, the suffix
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.B .o
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replacing
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.BR .mod
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in the name of the object.
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A file with suffix
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.B .mod
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is passed through the C preprocessor if it begins with a '#'.
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.PP
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Definition modules are not separately compiled. The compiler reads them when
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it needs them.
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Definition modules are expected to reside in files with names ending
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in
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.BR .def .
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The name of the file in which a definition module is stored must be the same as
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the module-name, apart from the extension.
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Also, in most Unix systems filenames are only 14 characters long.
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So, given an IMPORT declaration for a module called "LongModulName",
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the compiler will try to open a file called "LongModulN.def".
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The requirement does not hold for implementation or program modules,
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but is certainly recommended.
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.LP
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Other arguments refer to loader options,
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object modules, or object libraries.
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Unless the
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.B \-c
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flag is given, these modules and libraries, together with the results of any
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specified compilations, are passed (in the order given) to the
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link-editor to produce
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an output file named
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.IR a.out .
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You can specify a name for the executable by using the
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.B \-o
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option.
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.LP
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If a single
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.B Modula-2
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program is compiled and loaded all at once, the object module
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file is deleted.
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.SH OPTIONS
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.LP
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The \fB\-l\fIlib\fR, \fB\-d\fP, \fB\-n\fP, \fB\-N\fP,
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\fB\-r\fP, \fB\-s\fP, \fB\-S\fP, \fB\-i\fP, and \fB\-u\fP options are
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passed to the link-editor program.
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The \fB\-u\fP option takes an extra argument.
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.IP \fB\-c\fP
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.br
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Suppress the loading phase of the compilation, and force an object module to
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be produced, even if only one program is compiled.
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A single object module can be named explicitly using the
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.B \-o
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option.
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.IP \fB\-D\fIname\fR\fB=\fIdef\fR
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Define a symbol
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.I name
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to the
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preprocessor, as if by "#define".
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.IP \fB\-D\fIname\fR
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.br
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same as \fB\-D\fIname\fB=1\fR.
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.IP \fB\-I\fIpathname\fR
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.br
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Add
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.I pathname
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to the list of directories in which to search for
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.B #include
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files with filenames not beginning with slash.
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The preprocessor first searches for
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.B #include
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files in the directory containing
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.I sourcefile,
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then in directories in
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.B \-I
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options, and finally, in
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.I /usr/include.
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This flag is also passed to the compiler. When the compiler needs a definition
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module, it is first searched for in the current directory, then in the
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directories given to it by the \fB\-I\fP flag, and then in a default directory,
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.I CHANGE_ME.
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.I fm2
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This default directory contains all definition modules of
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the runtime system.
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.IP "\fB\-o \fIoutput\fR"
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Name the final output file
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.I output.
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.IP \fB\-O\fP
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.br
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Use a version of the compiler that is just a bit slower, but produces
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better code.
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.IP \fB\-U\fIname\fR
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.br
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Remove any initial definition of
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.I name.
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.IP \fB\-v\fP
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.br
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Verbose. Print the commands as they are executed.
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.IP \fB\-vn\fP
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.br
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Verbose, no execute. Only print the commands, do not execute them.
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.IP \fB\-L\fR
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do not generate code to keep track of
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the current location in the source code.
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.IP \fB\-w\fR\fIclasses\fR
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suppress warning messages whose class is a member of \fIclasses\fR.
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Currently, there are three classes: \fBO\fR, indicating old-flashioned use,
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\fBW\fR, indicating "ordinary" warnings, and \fBR\fR, indicating
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restricted Modula-2.
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If no \fIclasses\fR are given, all warnings are suppressed.
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By default, warnings in class \fBO\fR and \fBW\fR are given.
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.IP \fB\-W\fR\fIclasses\fR
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allow for warning messages whose class is a member of \fIclasses\fR.
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.IP \fB\-R\fP
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.br
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disable all range-checks.
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.IP \fB\-A\fP
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.br
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enable extra array bound checks. Unfortunately, the back-end used for this
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compiler is a bit sloppy, so extra array bound checks are needed if you want
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detection of array bound errors.
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.IP \fB\-3\fP
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.br
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Only accept Modula-2 programs that strictly conform to the 3rd Edition of
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[1].
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.IP \fB\-U\fP
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.br
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allow for underscores within identifiers. Identifiers may not start or end
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with an underscore, even if this flag is given.
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.IP \fB\-e\fP
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.br
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allow for local extensions. Currently, the only local extensions are
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procedure constants.
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.IP \fB\-M\fIcompiler\fR
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.br
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use \fIcompiler\fR as Modula-2 compiler instead of the default.
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.PP
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The compiler does not do any version-control. Instead, a makefile
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generator,
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.IR m2mm ,
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is included.
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.SH "SEE ALSO"
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.IP [1]
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N. Wirth, \fIProgramming in Modula-2\fP, 3rd edition, Springer Verlag.
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.IP [2]
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C.J.H. Jacobs, \fIThe ACK Modula-2 Compiler\fP.
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.IP [3]
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cc(1) unix manual page.
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.IP [4]
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m2mm(1) manual page.
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.SH DIAGNOSTICS
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Diagnostics are intended to be self-explanatory.
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