function mmake(target,mmakefilename)
%MMAKE A minimal subset of GNU make, implemented in MATLAB for MATLAB.
%   GNU Make "is a tool which controls the generation of executables and 
%   other non-source files of a program from the program's source files.
%   Make gets its knowledge of how to build your program from a file called
%   the makefile, which lists each of the non-source files and how to 
%   compute it from other files." For details see: www.gnu.org/software/make
%
%   Only a minimal subset of GNU Make features are implemented. Notably:
%   - GNU-style Makefile syntax (looks for MMakefile)
%       - Immediate assignments (var := value)
%       - Variable expansion via ${var} or $(var)
%       - The basic make 'rule' syntax (target : dependencies, followed by
%         tabbed MATLAB commands)
%       - Wildcards in targets (*.x : common.h)
%       - Pattern rules (%.x : %.y)
%       - Auto variables in rule commands:
%           - $@ = the target
%           - $< = first dependency
%           - $^ = all dependencies (with duplicates removed)
%           - $+ = all dependencies (in the exact order they are listed)
%           - $* = the pattern matched by '%' in a pattern rule
%           - $& = the directory of the target
%       - MATLAB command expansion via $(eval cmd) or ${eval cmd}. The
%           string 'cmd' is evaluated directly within MATLAB. It must return a
%           value of type char or a cell array of chars. In the event that a
%           multidimensional array or cell array is returned, all elements are
%           concatenated together with a space in between.
%       - As a convenience, the following variables are always pre-set:
%           ${MEX_EXT}      -> ${eval mexext}
%           ${OBJ_EXT}      -> 'obj' on win, 'o' on unix/mac
%           ${PWD}          -> ${eval pwd}
%           ${MEXFLAGS}     -> -O (Explicitly set MEX's default)
%           ${CFLAGS}       -> MEX default
%           ${CXXFLAGS}     -> MEX default
%           ${LDFLAGS}      -> MEX default
%   - MATLAB Function Makefile syntax (Looks for MMakefile.m)
%       - functions in the form [rules, variable] = MMakefile(), where
%           rules are structure with 'target', 'deps', and 'commands' fields
%           variable is dynamic structure, with each variable a field
%   - Implicit rules
%       - %.${MEX_EXT} is automatically built with 'mex' from %.c or %.cpp
%       - %.${OBJ_EXT} is automatically built with 'mex' from %.c or %.cpp
%       - %.dlm is automatically built with rtwbuild('%')
% 
%   - KNOWN BUGS/DEFICIENCIES
%       - Multiple targets are not supported in a rule. (eg, ${OBJS}:common.h)
%       - GNU-style MMakefile parsing could be greatly improved. It does not
%           generally respect quoting or escaping. As such, files, variables 
%           and rules cannot contain ':' or '=' characters. It does, however, 
%           support quoted and escaped filenames. If you need something fancy,
%           (eg, ifs, tricky strings, etc) use the function-style MMakefile.m.
%       - Needs more tests!
%
%   When called without any arguments, MMAKE searches the current working
%   directory for a file named 'MMakefile' and builds the first target
%   listed. With one argument, it builds that target from any rules listed
%   in 'MMakefile' (if it exists in the current working directory) or the
%   implicit rules. The optional second argument may be used to specify a
%   MMakefile in another directory or saved as a different name.
%
%   Copyright (c) 2011, Matt Bauman. mbauman@gmail.com.
%   All rights reserved.

%   Redistribution and use in source and binary forms, with or without
%   modification, are permitted provided that the following conditions are
%   met:
%
%   - Redistributions of source code must retain the above copyright notice,
%     this list of conditions and the following disclaimer.
%   - Redistributions in binary form must reproduce the above copyright
%     notice, this list of conditions and the following disclaimer in the
%     documentation and/or other materials provided with the distribution.
%
%   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
%   IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
%   THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
%   PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
%   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
%   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
%   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
%   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
%   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
%   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
%   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.