.TH CEM 1L 86/03/10
.SH NAME
cem \- ACK C compiler
.SH SYNOPSIS
.B cem
[ option ] ... file ...
.SH DESCRIPTION
.I Cem
is a
.I cc (1)-like
C compiler that uses the C front-end compiler
.I cemcom (1)
of the Amsterdam Compiler Kit.
.I Cem
interprets its arguments not starting with a '\-' as
source files, to be compiled by the various parts of the compilation process,
which are listed below.
File arguments whose names end with \fB.\fP\fIcharacter\fP are interpreted as
follows:
.IP .[ao]
object file.
.IP .[ci]
C source code
.IP .e
EM assembler source file.
.IP .k
compact EM file, not yet optimised by the EM peephole optimiser.
.IP .m
compact EM file, already optimised by the peephole optimiser.
.IP .s
assembler file.
.LP
The actions to be taken by
.I cem
are directed by the type of file argument and the various options that are
presented to it.
.PP
The following set of options, which is a mixture of options interpreted by
.I cc (1)
and 
.I ack (?)
are interpreted by
.I cem .
(The options not specified here are passed to the front-end
compiler 
.I cemcom (1L).)
.IP \fB\-B\fP\fIname\fP
Use 
.I name
as front-end compiler instead of the default 
.I cemcom (1).
.br
Same as "\fB\-Rcem=\fP\fIname\fP".
.IP \fB\-C\fP
Run C preprocessor 
.I /lib/cpp
only and prevent it from eliding comments.
.IP \fB\-D\fP\fIname\fP\fB=\fP\fIdef\fP
Define the 
.I name
to the preprocessor, as if by "#define".
.IP \fB\-D\fP\fIname\fP
.br
Same as "\fB\-D\fP\fIname\fP\fB=1\fP".
.IP \fB\-E\fP
Run only the macro preprocessor on the named files and send the
result to standard output.
.IP \fB\-I\fP\fIdir\fP
\&"#include" files whose names do not begin with '/' are always
sought first in the directory of the \fIfile\fP argument, then in directories
in \fB\-I\fP options, then in directories on a standard list (which in fact
consists of "/usr/include").
.IP \fB\-L\fP\fIdir\fP
Use \fIdir\fP as library-containing directory instead of the default.
.IP \fB\-P\fP
Same as \fB\-E\fP, but sending the result of input file \fIfile\fP\fB.[ceis]\fP
to \fIfile\fP\fB.i\fP.
.IP \fB\-R\fP
Passed to \fIcemcom\fP(1) in order to parse the named C programs according
to the C language as described in [K&R] (also called \fIRestricted\fP C).
.IP \fB\-R\fP\fIprog\fP\fB=\fP\fIname\fP
.br
Use \fIname\fP as program for phase \fIprog\fP of the compilation instead of
the default.
\&\fIProg\fP is one of the following names:
.RS
.IP \fBcpp\fP
macro preprocessor (default: /lib/cpp)
.IP \fBcem\fP
front\-end compiler (default: $CEM/bin/cemcom)
.IP \fBopt\fP
EM peephole optimiser (default: $EM/lib/em_opt)
.IP \fBdecode\fP
EM compact to EM assembler translator (default: $EM/lib/em_decode)
.IP \fBencode\fP
EM assembler to EM compact translator (default: $EM/lib/em_encode)
.IP \fBbe\fP
EM compact code to target\-machine assembly code compiler
(default: $EM/lib/vax4/cg)
.IP \fBcg\fP
same as \fBbe\fP
.IP \fBas\fP
assembler (default: /bin/as)
.IP \fBld\fP
linker/loader (default: /bin/ld)
.RE
.IP \fB\-R\fP\fIprog\fP\fB\-\fP\fIoption\fP
.br
Pass \fB\-\fP\fIoption\fP to the compilation phase indicated by \fIprog\fP.
.IP \fB\-S\fP
Same as \fB\-c.s\fP.
.IP \fB\-U\fP\fIname\fP
.br
Remove any initial definition of \fIname\fP.
.IP \fB\-V\fP\fIcm\fP.\fIn\fP,\ \fB\-V\fIcm\fP.\fIncm\fP.\fIn\fP\ ...
.br
Set the size and alignment requirements of the C constructs of the named
C input files.
The letter \fIc\fP indicates the simple type, which is one of
\fBs\fP(short), \fBi\fP(int), \fBl\fP(long), \fBf\fP(float), \fBd\fP(double) or
\fBp\fP(pointer).
The \fIm\fP parameter can be used to specify the length of the type (in bytes)
and the \fIn\fP parameter for the alignment of that type.
Absence of \fIm\fP or \fIn\fP causes the default value to be retained.
To specify that the bitfields should be right adjusted instead of the
default left adjustment, specify \fBr\fP as \fIc\fP parameter
without parameters.
.br
This option is passed directly to \fIcemcom\fP(1).
.IP \fB\-c\fP
Same as \fB\-c.o\fP.
.IP \fB\-c.e\fP
Produce EM assembly code on \fIfile\fP\fB.e\fP for the
named files \fIfile\fP\fB.[cikm]\fP 
.IP \fB\-c.k\fP
Compile C source \fIfile\fP\fB.[ci]\fP or
encode EM assembly code from \fIfile\fP\fB.e\fP
into unoptimised compact EM code and write the result on \fIfile\fP\fB.k\fP
.IP \fB\-c.m\fP
Compile C source \fIfile\fP\fB.[ci]\fP,
translate unoptimised EM code from \fIfile\fP\fB.k\fP or
encode EM assembly code from \fIfile\fP\fB.e\fP
into optimised compact EM code and write the result on \fIfile\fP\fB.m\fP
.IP \fB\-c.o\fP
Suppress the loading phase of the compilation, and force an object file to
be produced even if only one program is compiled
.IP \fB\-c.s\fP
Compile the named \fIfile\fP\fB.[ceikm]\fP input files, and leave the 
assembly language output on corresponding files suffixed ".s".
.IP \fB\-k\fP
Same as \fB\-c.k\fP.
.IP \fB\-l\fP\fIname\fP
.br
Append the library \fBlib\fP\fIname\fP\fB.a\fP to the list of files that
should be loaded and linked into the final output file.
The library is searched for in the library directory.
.IP \fB\-m\fP
Same as \fB\-c.m\fP.
.IP \fB\-o\fP\ \fIoutput\fP
.br
Name the final output file \fIoutput\fP.
If this option is used, the default "a.out" will be left undisturbed.
.IP \fB\-p\fP
Produce EM profiling code (\fBfil\fP and \fBlin\fP instructions to
enable an interpreter to keep track of the current location in the
source code)
.IP \fB\-t\fP
Keep the intermediate files, produced during the various phases of the 
compilation.
The produced files are named \fIfile\fP\fB.\fP\fIcharacter\fP where 
\&\fIcharacter\fP indicates the type of the file as listed before.
.IP \fB\-v\fP
Verbose.
Print the commands before they are executed.
.IP \fB\-vn\fP
Do not really execute (for debugging purposes only).
.IP \fB\-vd\fP
Print some additional information (for debugging purposes only).
.IP \fB\-\-\fP\fIanything\f
.br
Equivalent to \fB\-Rcem\-\-\fP\fIanything\fP.
The options 
.B \-\-C ,
.B \-\-E
and
.B \-\-P
all have the same effect as respectively
.B \-C ,
.B \-E
and
.B \-P
except for the fact that the macro preprocessor is taken to be the
built\-in preprocessor of the \fBcem\fP phase.
Most "\-\-" options are used by
.I cemcom (1)
to set some internal debug switches.
.IP loader\ options
.br
The options 
.B \-d ,
.B \-e ,
.B \-F ,
.B \-n ,
.B \-N ,
.B \-r ,
.B \-s ,
.B \-u ,
.B \-x ,
.B \-X
and
.B \-z
are directly passed to the loader.
.SH FILES
$CEM/bin/cem: this program
.br
$CEM/src/cem.c: C source of the \fBcem\fP program
.br
$CEM/bin/cemcom: C front end compiler
.br
$CEM/lib: default library-containing directory
.br
$CEM/src/cem.1: this manual page
.br
$CEM/src/cemcom.1: manual page for the C front end compiler
.SH SEE ALSO
cemcom(1), cc(1), ack(?), as(1), ld(1)
.br
.IP [K&R]
B.W. Kernighan and D.M. Ritchie, \fIThe C Programming Language\fP,
Prentice-Hall, 1978.
.SH DIAGNOSTICS
Any failure of one of the phases is reported.
.SH NOTES
.IP \(bu
The names $CEM and $EM refer to the directories containing the CEM compiler
and the ACK distribution tree respectively.
.IP \(bu
This manual page contains references to programs that reside on our site
which is a VAX 11/750 running UNIX BSD4.1.
Setting up \fBcem\fP requires some names to be declared in $CEM/src/cem.c
.SH BUGS
.IP \(bu
All intermediate files are placed in the current working directory which
causes files with the same name as the intermediate files to be overwritten.
.IP \(bu
.B Cem
only accepts a limited number of arguments to be passed to the various phases.
(e.g., 256).
.IP \(bu
Please report suggestions and other bugs to erikb@tjalk.UUCP