$(foreach i,1 2 3,$(eval $(call BOZO,$(i)))) The eval function tells Make to parse the structures as makefile syntax, to “enact” them. I’m not sure why Make objected to the un-eval’d rules this particular way, but that’s kind of academic.
Your makefile should ideally be named makefile, not make. Note that you can call your makefile anything you like, but as you found, you then need the -f option with make to specify the name of the makefile. Using the default name of makefile just makes life easier.
Your a b c: rule tells Make that this is how to build any of these targets, not how to build all of them. Make is not smart enough to analyze the commands and deduce that running the rule once will build all three. Make knows (from the output rule) that it must rebuild a, … Read more
The detection part is going to be OS dependent. Here’s a fragment that will work on Linux and Mac OS X: NPROCS:=1 OS:=$(shell uname -s) ifeq($(OS),Linux) NPROCS:=$(shell grep -c ^processor /proc/cpuinfo) endif ifeq($(OS),Darwin) # Assume Mac OS X NPROCS:=$(shell system_profiler | awk ‘/Number Of CPUs/{print $4}{next;}’) endif To get it working you are probably going … Read more
It means that make itself will ignore any error code from rm. In a makefile, if any command fails then the make process itself discontinues processing. By prefixing your commands with -, you notify make that it should continue processing rules no matter the outcome of the command. For example, the makefile rule: clean: rm … Read more
Putting ARCH and CROSS_COMPILE in the Makefile doesn’t work. You need to put them on the command line: make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi-
Take a look at the ExternalProject module. This will add a dummy target to your CMake project that is responsible for building the dependency. The command is quite complex and supports a lot of stuff that you probably won’t need in your case. Kitware (the company behind CMake) did a nice post called Building External … Read more
You have two problems in this rule (well, three): $(OBJECTS): $(SOURCES) $(CC) $(CFLAGS) -c $(SOURCES) $(LIB_PATH) $(LIBS) You haven’t noticed yet, but the rule makes each object dependent on all sources, and tries to build that way. Not a problem as long as you have only one source. Easy to fix with a static pattern … Read more
Make does not offer any way to read a content of the file to some variable. So, I consider it impossible to achieve the result without using external tools. However, if I am wrong, I’d be glad to learn some new trick. So, let’s assume there are two files, .env, being a technically correct shell … Read more
configure.ac and configure.in are two possible names for the master Autoconf source file, which is processed by autoconf to generate the configure shell script. configure.ac is preferred for new packages, configure.in is an older name which still works. (The .in suffix is now recommended to be used only for files which will be processed by … Read more