IMAKE(1) X Version 11(Release 5) IMAKE(1)
NAME
imake - C preprocessor interface to the make utility
SYNOPSIS
imake [ -Ddefine ] [ -Idir ] [ -Ttemplate ] [ -f filename ] [ -s filename
] [ -e ] [ -v ]
DESCRIPTION
Imake is used to generate Makefiles from a template, a set of cpp macro
functions, and a per-directory input file called an Imakefile. This
allows machine dependencies (such has compiler options, alternate command
names, and special make rules) to be kept separate from the descriptions
of the various items to be built.
OPTIONS
The following command line options may be passed to imake:
-Ddefine
This option is passed directly to cpp. It is typically used to
set directory-specific variables. For example, the X Window
System uses this flag to set TOPDIR to the name of the directory
containing the top of the core distribution and CURDIR to the
name of the current directory, relative to the top.
-Idirectory
This option is passed directly to cpp. It is typically used to
indicate the directory in which the imake template and
configuration files may be found.
-Ttemplate
This option specifies the name of the master template file (which
is usually located in the directory specified with -I) used by
cpp. The default is Imake.tmpl.
-f filename
This option specifies the name of the per-directory input file.
The default is Imakefile.
-s filename
This option specifies the name of the make description file to be
generated but make should not be invoked. If the filename is a
dash (-), the output is written to stdout. The default is to
generate, but not execute, a Makefile.
-e This option indicates the imake should execute the generated
Makefile. The default is to leave this to the user.
-v This option indicates that imake should print the cpp command
line that it is using to generate the Makefile.
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HOW IT WORKS
Imake invokes cpp with any -I or -D flags passed on the command line and
passes it the following 3 lines:
#define IMAKE_TEMPLATE "Imake.tmpl"
#define INCLUDE_IMAKEFILE "Imakefile"
#include IMAKE_TEMPLATE
where Imake.tmpl and Imakefile may be overridden by the -T and -f command
options, respectively.
The IMAKE_TEMPLATE typically reads in a file containing machine-dependent
parameters (specified as cpp symbols), a site-specific parameters file, a
file defining variables, a file containing cpp macro functions for
generating make rules, and finally the Imakefile (specified by
INCLUDE_IMAKEFILE) in the current directory. The Imakefile uses the
macro functions to indicate what targets should be built; imake takes
care of generating the appropriate rules.
Imake configuration files contain two types of variables, imake variables
and make variables. The imake variables are interpreted by cpp when
imake is run. By convention they are mixed case. The make variables are
written into the Makefile for later interpretation by make. By
convention make variables are upper case.
The rules file (usually named Imake.rules in the configuration directory)
contains a variety of cpp macro functions that are configured according
to the current platform. Imake replaces any occurrences of the string
``@@'' with a newline to allow macros that generate more than one line of
make rules. For example, the macro
#define program_target(program, objlist) @@\
program: objlist @@\
$(CC) -o $@ objlist $(LDFLAGS)
when called with program_target(foo, foo1.o foo2.o) will expand to
foo: foo1.o foo2.o
$(CC) -o $@ foo1.o foo2.o $(LDFLAGS)
On systems whose cpp reduces multiple tabs and spaces to a single space,
imake attempts to put back any necessary tabs (make is very picky about
the difference between tabs and spaces). For this reason, colons (:) in
command lines must be preceded by a backslash (\).
USE WITH THE X WINDOW SYSTEM
The X Window System uses imake extensively, for both full builds within
the source tree and external software. As mentioned above, two special
variables, TOPDIR and CURDIR, are set to make referencing files using
relative path names easier. For example, the following command is
generated automatically to build the Makefile in the directory lib/X/
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IMAKE(1) X Version 11(Release 5) IMAKE(1)
(relative to the top of the sources):
% ../.././config/imake -I../.././config \
-DTOPDIR=../../. -DCURDIR=./lib/X
When building X programs outside the source tree, a special symbol
UseInstalled is defined and TOPDIR and CURDIR are omitted. If the
configuration files have been properly installed, the script xmkmf(1) may
be used.
INPUT FILES
Here is a summary of the files read by imake as used by X. The
indentation shows what files include what other files.
Imake.tmpl generic variables
site.def site-specific, BeforeVendorCF defined
*.cf machine-specific
*Lib.rules shared library rules
site.def site-specific, AfterVendorCF defined
Project.tmpl X-specific variables
*Lib.tmpl shared library variables
Imake.rules rules
Imakefile
Library.tmpl library rules
Server.tmpl server rules
Note that site.def gets included twice, once before the *.cf file and
once after. Although most site customizations should be specified after
the *.cf file, some, such as the choice of compiler, need to be specified
before, because other variable settings may depend on them.
The first time site.def is included, the variable BeforeVendorCF is
defined, and the second time, the variable AfterVendorCF is defined. All
code in site.def should be inside an #ifdef for one of these symbols.
FILES
/usr/tmp/tmp-imake.nnnnnn temporary input file for cpp
/usr/tmp/tmp-make.nnnnnn temporary input file for make
/lib/cpp default C preprocessor
SEE ALSO
make(1), xmkmf(1)
S. I. Feldman, Make - A Program for Maintaining Computer Programs
ENVIRONMENT VARIABLES
The following environment variables may be set, however their use is not
recommended as they introduce dependencies that are not readily apparent
when imake is run:
IMAKEINCLUDE
If defined, this should be a valid include argument for the C
preprocessor. E.g., ``-I/usr/include/local''. Actually, any valid
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cpp argument will work here.
IMAKECPP
If defined, this should be a valid path to a preprocessor program.
E.g. ``/usr/local/cpp''. By default, imake will use /lib/cpp.
IMAKEMAKE
If defined, this should be a valid path to a make program, such as
``/usr/local/make''. By default, imake will use whatever make
program is found using execvp(3). This variable is only used if the
``-e'' option is specified.
AUTHOR
Todd Brunhoff, Tektronix and MIT Project Athena; Jim Fulton, MIT X
Consortium
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