I've only hit on the bare minimum of high points here.
#UNDEFINED REFERENCE TO C++ HOW TO#
The good point of this is that make automatically looks at the timestamps on the files, so it will only re-compile the files that have changed since the last time you compiled them (i.e., files where the ".c" file has a more recent time-stamp than the matching ".o" file).Īlso note that 1) there are lots of variations in how to use make when it comes to large projects, and 2) there are also lots of alternatives to make. It implicitly looks for a file named Makefile, and runs whatever rules it contains. You typically store this in a file named Makefile, and to build your program, you just type make at the command line. This assumes the name of the C compiler is in a macro named CC (implicitly defined like CC=gcc) and allows you to specify any flags you care about in a macro named CFLAGS (e.g., CFLAGS=-O3 to turn on optimization) and $< is a special macro that expands to the name of the source file. Most versions of make (including the one in MinGW I'm pretty sure) have a built-in "implicit rule" to tell them how to create an object file from a C source file. The second is a rule to tell make 1) that the executable depends on the object files, and 2) telling it how to create the executable when/if it's out of date compared to an object file. The first is just a macro for the names of the object files. In this case you'd have something like this: OBJS=testpoint.o point.o You normally specify what needs to be done via a makefile, and use make to do the work. In a larger program, you typically compile and link separately to avoid re-compiling anything that hasn't changed. You'll need/want to eliminate one (undoubtedly the one in point.c).
#UNDEFINED REFERENCE TO C++ CODE#
With the code as it's written right now, however, you'll then run into the opposite problem: multiple definitions of main. so that it knows to link the functions from both together. Make sure in c++ whenever you are getting any compilation errors like undefined reference to main c++ or undefined reference to func c++ ( here func can be any name of function.) then you have to add definition of that function inside your file. How are you doing the compiling and linking? You'll need to specify both files, something like: gcc testpoint.c point.c
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