minix/man/man1/cc.1

.TH CC 1
.SH NAME
cc \- MINIX 3 C compiler
.SH SYNOPSIS
.in +.5i
.ti -.5i
.BR cc |\c
.BR pc |\c
.BR m2
.RB [ "\-D \fIname\fR[\fB=\fIvalue" ]]
\&...
.RB [ "\-U \fIname" ]
\&...
.RB [ "\-I \fIdirectory" ]
\&...
.RB [ \-.\fIsuffix ]
\&...
.RB [ \-c ]
.RB [ \-E ]
.RB [ \-P ]
.RB [ \-S ]
.RB [ \-c.\fIsuffix ]
.RB [ \-O ]
.RB [ \-O\fIlevel ]
.RB [ \-OS ]
.RB [ \-OT ]
.RB [ \-g ]
.RB [ \-n ]
.RB [ \-a ]
.RB [ \-R ]
.RB [ \-A ]
.RB [ \-s ]
.RB [ \-fsoft ]
.RB [ \-fnone ]
.RB [ \-w ]
.RB [ \-wo ]
.RB [ \-ws ]
.RB [ \-wa ]
.RB [ \-3 ]
.RB [ \-_ ]
.RB [ \-W\fIname\fB\-\fIoption ]
\&...
.RB [ \-m\fIarch ]
.RB [ "\-o \fIoutfile" ]
.RB [ "\-L \fIdirectory" ]
\&...
.RB [ \-i ]
.RB [ \-sep ]
.RB [ \-com ]
.RB [ \-r ]
.RB [ "\-stack \fIsize" ]
.I operand
\&...
.sp .4v
.ti -.5i
(Minix-86 subset:)
.ti -.5i
.BR cc |\c
.BR pc |\c
.BR m2
.RB [ "\-D\fIname\fR[\fB=\fIvalue" ]]
\&...
.RB [ "\-U\fIname" ]
\&...
.RB [ "\-I\fIdirectory" ]
\&...
.RB [ \-.o ]
\&...
.RB [ \-c ]
.RB [ \-E ]
.RB [ \-P ]
.RB [ \-S ]
.RB [ \-c.\fIsuffix ]
.RB [ \-O ]
.RB [ \-O\fIlevel ]
.RB [ \-n ]
.RB [ \-a ]
.RB [ \-R ]
.RB [ \-A ]
.RB [ \-s ]
.RB [ \-f ]
.RB [ \-w ]
.RB [ \-wo ]
.RB [ \-ws ]
.RB [ \-wa ]
.RB [ \-3 ]
.RB [ \-_ ]
\&...
.RB [ \-m ]
.RB [ "\-o \fIoutfile" ]
.RB [ "\-L\fIdirectory" ]
\&...
.RB [ \-i ]
.RB [ \-sep ]
.RB [ \-com ]
.I operand
\&...
.in -.5i
.SH DESCRIPTION
.BR Cc ,
.BR pc ,
and
.BR m2
are the call names of the MINIX 3 C, Pascal, and Modula-2 compilers from
the Amsterdam Compiler Kit (ACK).
.PP
All these call names are links to the
.B acd
driver program.
.B Acd
uses the driver description file
.B /usr/lib/descr
that describes the steps necessary to compile a source file.  The
.BR acd (1)
manual page describes a few more flags, like
.BR \-v ,
that may be useful for debugging compiler problems.
.PP
Minix-86 uses a C program as the compiler driver.  This driver is not as
flexible as the one implemented with the
.B acd
driver, and offers a smaller number of options.  The second line of
the synopsis above shows the options that the Minix-86 driver supports.  The
rest of this manual page is geared towards the
.B acd
driver.  People writing software for Minix-86, or that should be
portable to all MINIX 3 versions should stick to the options listed under
the Minix-86 compiler.
.SH OPTIONS
The transformations done by the compiler are modified by the following
options.  They are a superset of the options required by \s-2POSIX\s+2,
with the MINIX 3 or compiler specific ones are marked as such.  Options
for one specific compiler are ignored for others.  Read the OPTIONS section
of
.BR acd (1)
for the driver specific options.
.PP
.TP
.BI \-D " name\fR[\fB=\fIvalue\fR]"
Same as if
.BI #define " name value"
had been given.
.B 1
is assumed if
.I value
is omitted.  This argument, like all the other double arguments, may also
be given as a single argument.  (I.e. either as
.BI \-D "\0name"
or
.BI \-D name\fR.)
(The Minix-86 driver is not so flexible, the proper form can be seen in
the synopsis.)
.TP
.BI \-U " \fIname"
Undefine the pre-defined symbol
.IR name .
.TP
.BI \-I " directory"
Extend the include directory path with the given directory.  These
directories are searched for include files in the given order before the
standard places.  The standard place for the C compiler is
.BR /usr/include ,
and for the Modula-2 compiler it is
.BR /usr/lib/m2 .
.TP
.BI \-. suffix
Act as if a source file with the given suffix is present on the command line.
For each language found on the command line the appropriate libraries are
selected.  The first language mentioned selects the runtime startoff.
The call name of the driver also chooses the language, so \fBcc\fP is an
implicit
.BR \-.c .
The runtime startoff can be omitted by specifying
.B \-.o
for those rare cases where you want to supply your own startoff.  (MINIX 3)
.TP
.B \-c
Transform the input files to object files and stop.  The
.B \-o
option may be used under MINIX 3 to set the name of the object file.
.BR Make (1)
likes this, because
.BI "cc \-c" " dir/file" .c
puts
.IB file .o
in the current directory, but
.BI "cc \-c" " dir/file" .c
.BI \-o " dir/file" .o
puts the
.B .o
file where
.B make
expects it to be by its builtin
.B .c.o
rule.
(Minix-86 can only use
.B \-o
to name an executable.)
.TP
.B \-E
Run the preprocessor over the input files and send the result to standard
output or the file named by
.BR \-o .
Standard input is read if an input file is named "\fB\-\fR".
.TP
.B \-P
Run the preprocessor over the input files and put the result to files
with the suffix
.BR .i .
File and line number information is omitted from the output.  Use
.B \-P \-E
under MINIX 3 to omit this info for
.B \-E
too.
.TP
.B \-S
Transform the input files to assembly files with suffix
.BR .s .
.TP
.BI \-c. suffix
Transform the input files to files with the given suffix.  This can only
succeed if there is a valid transformation from the input file to the
given suffix.  The same goes for
.B \-c
and other options that are just special cases of this option, except for
.BR \-P ,
.B \-c.i
keeps the line number info.  The option
.B \-c.a
makes the driver transform the input files to object files and add them to a
library.  (So you do not need to know how the archiver works.)  Note that you
need to give object files as arguments if you want to replace old object
files.  Transformed files are added under a (unique) temporary name.  With
.B \-o
you can name the library.  (MINIX 3)  (Minix-86 can't do
.BR \-c.a .)
.TP
.B \-O
Optimize code.  This option is a no-op, because all the compilers already
use the
.BR \-O1
optimization level to get code of reasonable quality.  Use
.BR \-O0
to turn off optimization to speed up compilation at debug time.
.TP
.BI \-O level
Compile with the given optimization level.  (MINIX 3)
.PP
.B \-OS
.br
.B \-OT
.RS
Optimize for space or for time.  (MINIX 3)
.RE
.TP
.B \-g
Compile the C source with debugging information.  (The way
.BR \-g ,
.B \-s
and
.B \-O
interact is left unspecified.)
.TP
.B \-n
Omit the file and line number tracking that is used for runtime error reports
from Pascal or Modula-2 programs.  The
.B \-n
flag is normally used to compile library modules, but may also be useful to
make a program smaller and faster once debugged.  (Pascal & Modula-2)
.TP
.B \-a
Enable assertions, i.e. statements of the form \fBassert\fI\ test\fR
that cause a descriptive runtime error if the boolean expression
.I test
evaluates false.  (Pascal & Modula-2)
.TP
.B \-R
Disable runtime checks like overflow checking.  (Pascal & Modula-2)
.TP
.B \-A
Enable array bound checks.  (Pascal & Modula-2)
.TP
.B \-s
Strip the resulting executable of its symbol table.
.PP
.B \-fsoft
.br
.B \-f
.RS
Use software floating point instead of hardware floating point.  This is
a loader flag, but in general it is best to specify this flag in all
phases of the compilation.  (MINIX 3)
.RE
.TP
.B \-fnone
Ignored.  Used under Minix-vmd to omit floating point printing/scanning
code.  The standard MINIX 3 compiler figures this out automatically using
a special loader trick.  (MINIX 3)
.TP
.B \-w
Do not produce warnings about dubious C language constructs.  Normally
the compiler is configured to do the maximum amount of checking
without being too annoying.  (MINIX 3)
.TP
.B \-wo
Omit warnings about old (K&R) style.  (MINIX 3)
.TP
.B \-ws
Omit strict warnings.  (MINIX 3)
.TP
.B \-wa
Omit all warnings.  (MINIX 3)
.TP
.B \-3
Only accept 3rd edition Modula-2.  (Modula-2)
.TP
.B \-_
Allow underscores in Pascal or Modula-2 identifiers, but not at the beginning
of an identifier.  (Pascal & Modula-2)
.TP
.BI \-W name \- option
If
.I name
is the name of the compiler this driver is working for, then
.I option
is activated for that compiler.  See below for a per-compiler list.  Any other
.B \-W
option is ignored.  (\fB\-W\fP is described by \s-2POSIX\s+2 as an optional
flag to send options to the different compiler passes with a totally
different (and nicely ignored) syntax as described here.)  (Minix-86 ignores
any
.B \-W
flag.)
.TP
.B \-m
Under Minix-86 this option transforms the function declarations (prototypes)
to the old K&R form, i.e. the arguments declarations are removed.  This saves
a lot of memory in the compiler and may allow a large program to be compiled.
One must make sure that function arguments are properly type-cast where
necessary.  (MINIX 3)
.TP
.BI \-m arch
Set the target architecture for a cross compiler.  Normally the compiler
produces code for the same architecture it itself is compiled for.  The
.B ARCH
environment variable may also be used to set the architecture.  Architectures
names are:
.B i86
(Intel 8086 and 286),
.B i386
(Intel 386, 486, ...),
.B m68000
(Motorola MC68000 & MC68010, 16-bit ints),
.B m68010
(Motorola MC68000 & MC68010, 32-bit ints),
.B m68020
(Motorola MC68020, 32-bit ints),
.B sparc
(Sun SPARC).  (MINIX 3)  (Ignored under Minix-86.)
.TP
.BI \-o " outfile"
Set the output file for the
.BR \-c ,
.BR \-c.a ,
and
.BR \-E
options, or choose the executable name instead of the default
.BR a.out .
(Minix-86 can only choose the executable name.)
.TP
.BI \-L " directory"
Extend the library search path with
.IR directory .
These directories are searched for libraries named by
.B \-l
in the given order before the standard places.  The standard places are
.B /lib/\c
.IR arch ,
and
.B /usr/lib/\c
.IR arch .
The search for libaries in directories added with
.B \-L
looks in
.IB directory /\c
.IR arch
and
.I directory
itself.
.RI ( Arch
is the machine architecture name.  This is
MINIX 3 dependent, compilers on other systems usually only look in
.IR directory .)
(Minix-86 only has
.B /lib
and
.B /usr/lib
as the standard places.)
.PP
.B \-sep
.br
.B \-com
.RS
Create a Separate I&D or a common I&D executable.  The text segment of a
separate I&D executable is read-only and shareable.  For an
.B i86
binary this also means that the text and data segment can each be 64
kilobytes large instead of just 64 kilobytes together.  Separate I&D is the
default.  Common I&D is probably only useful for the bootstraps.  The
.B \-i
option has the same meaning as
.BR \-sep ,
but should no longer be used.
(MINIX 3)
.RE
.TP
.B \-r
Makes the loader produce a relocatable object file, i.e. a file that
may be loaded again.  The runtime startoff and the default libraries are
omitted, only the files mentioned are combined.  (MINIX 3)
.TP
.BI \-stack " size"
Allow the process
.I size
bytes of heap and stack.
.I Size
is a C-style decimal, octal, or hexadecimal number, optionally followed by
the multipliers
.BR m ,
.BR k ,
.BR w ,
and
.B b
for mega (1024*1024), kilo (1024), "word" (2 or 4), and byte (1).  Uppercase
letters are accepted too.  A size of
.B 32kw
is used by default, translating to 64k for
.BR i86 ,
and 132k for other architectures.  Too large a size is rounded down to keep
the data segment within 64 kilobytes for the
.BR i86 .
(MINIX 3)
.SH OPERANDS
All leftover operands are treated as files to be compiled, with one
exception.  The construct
.BI \-l " library"
is used to denote a library, usually
.BI lib library .a\fR,
that is to be searched in the directories mentioned with
.B \-L
or the standard places.  These libraries keep their place among the
(transformed) input files when presented to the loader.  (It is a common
mistake to write
.BR "cc\ \-lcurses\ x.c"
instead of
.BR "cc\ x.c\ \-lcurses" .)
.SH IMPLEMENTATION
The MINIX 3 compiler implementation uses the ACK compilers adapted for use
under MINIX 3 as described below.  Read
.BR ACK (7)
for more detailed information on the ACK compilers themselves.
.SS "Feature test macros"
The preprocessors are given these arguments to define feature test macros:
.B \-D__ACK__
tells what compiler is used.
.B \-D__minix
tells that this is MINIX 3.
.BI \-D__ arch
tells the architecture.
(More macros are defined, but they are only to be used in the include files.)
.PP
The symbols above are predefined by the preprocessor so that your program is
able to "sense" the environment it is in.  It is also possible for your
program to do the opposite, to tell what kind of environment it likes to
have.  By default,
.B cc
compiles a standard C program.  If you want the extensions described in
POSIX.1 to become visible, then you have to set
.BR _POSIX_SOURCE " to " 1
at the start of your program.
To enable \s-2UNIX\s+2 or MINIX 3 extensions you need to also set
.BR _MINIX " to " 1 .
If you don't want to clutter your source files with these symbols then you
can use
.B cc \-D_MINIX \-D_POSIX_SOURCE
to get the POSIX.1 and the MINIX 3 extensions.
.SS "Preprocessing"
Pascal, Modula-2, EM source (see below), and Assembly source are
preprocessed by the C preprocessor if the very first character in the file
is a '\fB#\fP' character.
.SS "Assembly dialects"
No two compilers use the same assembly language.  To be able to use the same
assembly dialect for the low level support routines an assembly converter is
provided.  The input of this converter can be of type
.BR ack ,
.BR ncc ,
or
.BR bas ,
and the output can be of type
.BR ack ,
.BR ncc ,
or
.BR gnu .
The suffix of the file tells the assembly dialect (see below), or one can
use the option
.BI \-Was\- dialect
to tell the driver what the dialect of a plain
.B .s
file is.  The assembly converter is not as smart as the assembler, the
translation is more or less a text substitution.  It leaves a lot of
checking to the target assembler.  You have to restrict yourself to a subset
that is understood by both assemblers.  The ACK assembler for instance
doesn't care if you use `ax' or `eax' for a 32 bit register, it looks at the
instruction type.  The GNU assembler doesn't like this, so you have to use
the proper register name in ACK assembly that is to be translated to GNU
assembly.  Expressions are converted as is, even if the operator precedence
rules of the two assembly languages differ.  So use parentheses.  The
converter does promise one thing: compiler output can be properly
translated.  (Note that under Minix-86
.B \-W
is ignored.  All assembly should therefore be in the "ncc" dialect.)
.SH FILES
.TP 10
.B /usr/lib/descr
The compiler description file.
.TP
.B .c
Suffix of a C source file.
.TP
.B .mod
Modula-2.
.TP
.B .p
Pascal.
.TP
.B .i
Preprocessed C source.
.TP
.B .k
ACK machine independent compact EM code produced by the C, Pascal, or
Modula-2 front end (or any other ACK front end.)  The ACK compilers are
based on the UNCOL idea where several front ends compile to a common
intermediate language, and several back ends transform the intermediate
language to the target machine language.  The ACK intermediate language
is named "EM".
.TP
.B .m
Peephole optimized EM.
.TP
.B .gk
Result of the (optional) EM global optimizer.
.TP
.B .g
Result of the second EM peephole optimizer used after the global optimizer.
.TP
.B .e
Human readable EM.  (Human created or decoded compact EM.)
.TP
.B .s
Target machine assembly.  (Current compiler dialect.)
.TP
.B .ack.s
ACK assembly.
.TP
.B .ncc.s
ACK Xenix style assembly.  This dialect is used by the 16 bit ACK ANSI C
compiler.
.TP
.B .gnu.s
GNU assembly.
.TP
.B .bas.s
BCC assembly.  (Used by the Bruce Evans' BCC compiler, for many years the
compiler for Minix-386.)
.TP
.B .o
Object code.
.TP
.B .a
Object code library.
.TP
.B a.out
Default output executable.
.SH "SEE ALSO"
.BR acd (1),
.BR ACK (7).
.SH AUTHOR
Kees J. Bot (kjb@cs.vu.nl)