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The recipe lines for a target must begin with a tab and an equivalent number of spaces just won't do. In what is widely considered one of the dumber decisions in the history of computing, a Makefile distinguishes between tabs and spaces. We are providing a simple program for counting. Make is failing with a cryptic error about Makefile: *** missing separator. You will create your Makefile, clog.h, and miniunit.h from scratch (i.e., i.e., starting with a blank file). A search for makefile on will turn up a treasure trove. Reading makefiles from real world projects is a good way to see make in action.
#BASIC MAKEFILE FOR C PROGRAM MANUAL#
An inexhaustible source of make wisdom is the full manual for GNU make which will tell you more that you could ever want to know.Now that you know that a Makefile is just a cookbook that culminates in the tasty program you wish to create, you're ready to add your favorite recipes and bon appetit! Going further With that finishing touch, you have a general Makefile that can be easily re-purposed for any Raspberry Pi project. # The run target uploads a freshly made binary image to rpi bootloader We use this target to invoke the command rpi-run.py blink.bin to load our newly-built program on the Pi. One more special variable $^ refers to all elements in the right part of the rule, after the :, which is to say all of the dependencies.įor further convenience, we can add a rule for the run target. $refers to the left part of the rule, before the :.% is a wildcard symbol when used in a rule %.o for example matches any file that ends with.
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# filename.bin is built from filename.elfĪrm-none-eabi-objcopy $< -O binary symbols that begin with $ and % in a pattern rule are handled by make using the following interpretations: s) But because Make works backward from the object files to the source, we need to compute all the object files we want from our source files. # This pattern rule compiles a C program into an object file.Īrm-none-eabi-gcc $(CFLAGS) -c $< -o # This pattern rule converts assembly instructions into an object file.Īrm-none-eabi-as $(CFLAGS) $< -o # This pattern rule links an object file into an executable ELF file.Īrm-none-eabi-gcc $(LDFLAGS) $< -o # This pattern rule extract binary from an ELF executable The simplest and fastest way I found to do this was to just shell out and use find.