From http://www.gnu.org/software/make/manual/make.html: There is another assignment operator for variables, `?=’. This is called a conditional variable assignment operator, because it only has an effect if the variable is not yet defined. This statement: FOO ?= bar is exactly equivalent to this (see The origin Function): ifeq ($(origin FOO), undefined) FOO = bar endif Probably CC … Read more
It’s probably not impossible, but most likely so hard that it would be easier to write two makefiles anyway. Both GNU make (used in Linux) and nmake have include directives though, so some common things can be put in a common makefile that is included by the main makefile.
You can use the $(subst) command, combined with a little trick to get a variable that has a value of a single space: p = /usr /usr/share /lib noop= space = $(noop) $(noop) all: @echo $(subst $(space),:,$(p))
Does the following function meet the purpose? FILTER_OUT = $(foreach v,$(2),$(if $(findstring $(1),$(v)),,$(v))) $(call FILTER_OUT,g, seven eight nine ten)
The steps: The autogen.sh script generates the configure script (from configure.ac, using autoconf) and any files it needs (like creating Makefile.in from Makefile.am using automake). This requires autotools to be installed on your system, and it must be run when checking out the project from source control (if configure isn’t checked in). People who download … Read more
Here is what I did, and it works on my MacOS: Step1: Install homebrew (installation command comes from https://brew.sh/): /usr/bin/ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)” Step2: Use homebrew to install make brew install make –with-default-names just incase it doesn’t work, try this: brew install homebrew/dupes/make –with-default-names Step3: You need to change the default command to use … Read more
This seems to achieve simple bash completions for me on El Capitan: # .bashrc function _makefile_targets { local curr_arg; local targets; # Find makefile targets available in the current directory targets=”” if [[ -e “$(pwd)/Makefile” ]]; then targets=$( \ grep -oE ‘^[a-zA-Z0-9_-]+:’ Makefile \ | sed ‘s/://’ \ | tr ‘\n’ ‘ ‘ \ ) … Read more
Kernel Makefiles are part of the kbuild system, documented in various places on the web, for example http://lwn.net/Articles/21835/. The relevant excerpt is here: — 3.1 Goal definitions Goal definitions are the main part (heart) of the kbuild Makefile. These lines define the files to be built, any special compilation options, and any subdirectories to be … Read more
Your tutorial promotes old and bad practices, you should avoid it IMHO. In your rule here: $(ODIR)/%.o: %.c $(DEPS) You’re telling make to look for sources in the current directory while they actually reside in the src directory, thus this pattern is never used and you have no suitable one. Make sure you organize your … Read more
In short, Ninja parses faster, and has built-in features that reduce the amount to parse. From the philosophical overview in the ninja manual: Where other build systems are high-level languages, Ninja aims to be an assembler. Ninja files are often “compiled” from other makefiles, making it a two-step process whereas Make is a single step. … Read more