67 lines
1.3 KiB
Markdown
67 lines
1.3 KiB
Markdown
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---
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title: makefile
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description:
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published: true
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date: 2023-04-28T02:38:18.678Z
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tags:
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editor: markdown
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dateCreated: 2023-04-28T02:22:37.379Z
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---
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# Makefile
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```
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VARIABLE = VALUE
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RULE: Dependency $(FUNCTION)
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$(FUNCTION)
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Task
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VAR = value #normale value assignment
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VAR := $(VAR).o #value assignment with expansion
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VAR != uname #add output of command
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VAR := $(sh uname) #alternative way to add output
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VAR += -Wall -Werror -Wextra #Append to value
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VAR ?= $(VAR) #only sets if not defined
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Text functions
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$(SRC:.c=.o) #Changes all suffixes from .c to .o
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Filename functions
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$(addprefix obj/,$(OBJ)) #Adds a directory to the filenames
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conditional functions
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if
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ifeq
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ifdef
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else
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or
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and
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endif
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foreach
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value function
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$(value (VAR)) #print value without expanding
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shell function
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$(shell COMMAND) #insert output here
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control functions
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$(error Something went wrong) #Makefile will stop here
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$(warning This is a warning) #Display a warning
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$(info This is some info) #Display some info
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$@ #is the rule name
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$< #is the first dependancy
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$^ #are all dependancies
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$? #only dependencies that have changed
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$| #If anything changed, rebuild everything
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% #acts as a wildcard in the rule
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.PHONY: all clean fclean re bonus #Doesn't create a file named after the target
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```
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