Make: Difference between revisions
From wikinotes
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* defining each object-file, it's cpp/header files, and all other dependent header files | * defining each object-file, it's cpp/header files, and all other dependent header files | ||
</blockquote><!-- core concepts --> | </blockquote><!-- core concepts --> | ||
= Other = | = Other = | ||
Revision as of 13:08, 6 September 2021
Makefiles are automation built around shellscripts,
they are normally used to codify build instructions, but can be used for anything.
Documentation
Gnu Makefile conventions https://www.gnu.org/prep/standards/html_node/Makefile-Conventions.html Text Function Reference (ex: ($shell ..) $(patsubst ..))https://www.gnu.org/software/make/manual/html_node/Text-Functions.html Automatic Variables (ex: $@, $<)https://www.gnu.org/software/make/manual/html_node/Automatic-Variables.html#Automatic-Variables
Tutorials
university of maryland tutorial http://www.cs.umd.edu/class/fall2002/cmsc214/Tutorial/makefile.html mrbook tutorial http://mrbook.org/blog/tutorials/make/
Notes
make usage make basics make conventions make examples
Core Concepts
At it's core, a makefile is responsible for doing 3x things:
- configuring compiler to use, and compiler-flags
- defining program to compile, and all the object-files it is dependent on
- defining each object-file, it's cpp/header files, and all other dependent header files
Other
make builtins
gnu-make has a subset of commands that you can use within your makefile.
See excellent documentation: https://www.gnu.org/software/make/manual/html_node/Text-Functions.html .
@command # run cli-command $(shell command) # assign output of cli-command to var $(subst from,to,text) $(patsubst %.c,%.o,file1.c file2.c file3.c) # '%' is a wildcard match. '%'s value is preserved in replacement $(var:pattern=replacement) # single variable pattern-replacementcreate directory
Occasionally, it makes sense to specify the creation of directories in your makefile. (such as creating a /bin directory that can be put in .gitignore). You can do this with the following snippet:
BINDIR = bin dummy_build_folder := $(shell mkdir -p $(BINDIR))
echo variable
Sometimes it's handy to try to figure out just what exactly your compiler is running. You can do this. using a prefix of
@runs a shell command.all: @clear @echo "_INCL: $(_INCL)" @echo "_SRCDIR: $(_SRCDIR)"
