ajout explications
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Hugo LAMY
119
Makefile
119
Makefile
@@ -1,9 +1,11 @@
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# - - - - - - - - - #
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# variables names #
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# - - - - - - - - - #
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# - - - - - - - - -
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# variables names
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# - - - - - - - - -
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# each variable will expand in its value when used
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NAME = libft.a
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DEP = libft.h
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CC = gcc
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CFLAGS = -Wall -Wextra -Werror -I. -c
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SRCS = ft_atoi.c \
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@@ -75,59 +77,67 @@ SRCS = ft_atoi.c \
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ft_arraymap.c \
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ft_putnbrbase.c \
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ft_strmultisplit.c
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ODIR = ./builds
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# - "addprefix" is a built-in expansion function used by
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# makefile to perform a transformation on file names, in
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# this case we want to put all the .o files in a
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# subdirectory named "build"
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# - $(SRCS:.c=.o) is a "substitute reference", an
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# abbreviation for the expansion function "patsubst" :
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# $(patsubst %.c,%.o,$(SRCS))
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OBJ = $(addprefix $(ODIR)/, $(SRCS:.c=.o))
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# - - - - - - - - - -
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# rules to execute
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# - - - - - - - - - -
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# when you write "make" in command line it will execute the
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# first rule wrote in the Makefile, wich is ALL by convention
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# because usually when you type "make" you expect it to build all
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# it first verify if ODIR is created and if not create it
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# then it calls NAME to create the library
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# - - - - - - - - - - - #
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# rules to execute #
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# - - - - - - - - - - - #
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# - when you write "make" in command line it will execute
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# the first rule wrote in the Makefile, wich is "all" by
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# convention because usually when you type "make" you
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# expect it to build all
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# - it first verify if ODIR is created and if not create
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# it, then it calls NAME to create the library
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all: $(ODIR) $(NAME)
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# ODIR create the folder where all the .o files will be stored
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# create the folder where all the .o files will be stored
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$(ODIR):
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mkdir -p $(ODIR)
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# NAME will create the library libft.a
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# first it checks if any OBJ (files.o) have more recent
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# - NAME will create the library libft.a
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# - first it checks if any OBJ (files.o) have more recent
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# date of modification than NAME (libft.a), and for each
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# it will execute
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# first it checks if the date of modification of any .o (OBJ)
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# is more recent thant the one of libft.a (NAME)
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# and for each of them it will execute
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# if only one .c has been modified then only one .o will have been too
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# so NAME will execute only for this one
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# ranlib doesn't need to be seen so it's precedeed by a "@"
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$(NAME): $(OBJ)
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# - $(OBJ) will expand in the list of files.o and each of
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# them will call the rule "$(ODIR)/%.o:" below because it
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# has its exact pattern
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# - NAME will execute only for the .c that has been
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# modified since last creation of NAME
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# - ranlib is precedeed by a "@" to avoid being print
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$(NAME): $(OBJ) $(DEP)
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ar -rc $@ $<
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@ranlib $@
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# - this rule depend of the list of files.c and file.h
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# - if any of these files are more recent than the file
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# builds/file.o equivalent then the rule will rebuild
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# this .o file
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$(ODIR)/%.o: %.c
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$(COMPILE.c) -o $@ $<
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$(CC) $(CFLAGS) -c $<
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clean:
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/bin/rm -rf $(ODIR)
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fclean: clean
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/bin/rm -f $(NAME)
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re: fclean all
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.PHONY: clean
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all: $(NAME)
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$(NAME): $(OBJ)
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ar rc $(NAME) $(OBJ)
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@ranlib $(NAME)
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clean:
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/bin/rm -f $(OBJ)
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fclean: clean
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/bin/rm -f $(NAME)
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re: fclean all
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.PHONY: clean fclean all re
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@@ -446,20 +456,9 @@ re: fclean all
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# makefile basique
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# - - - - - - - - -
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# - - - - - - - - - - - - - - - - - - - - - - - - -
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# ne pas tout recompiler a la moindre modification
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# - - - - - - - - - - - - - - - - - - - - - - - - -
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# - - - - - - - - - - - - - - - - - - - -
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# mettre les fichiers .o dans un dossier
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# - - - - - - - - - - - - - - - - - - - -
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# - - - - - - - - - - - -
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# make un autre makefile
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# - - - - - - - - - - - -
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# exemple d'un makefilede basic
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#
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# # |DECLARATION VARIABLES
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# # NAME = libtest.h
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# # CC = gcc
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# # CFLAGS = -I. -c
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@@ -476,6 +475,19 @@ re: fclean all
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# par exemple pour construire des .o a partir de .c
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# qui sont utilisees par défaut si les variables
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# sont bien nomee (genre CC ou CFLAGS)
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# - - - - - - - - - - - - - - - - - - - - - - - - -
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# ne pas tout recompiler a la moindre modification
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# - - - - - - - - - - - - - - - - - - - - - - - - -
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# - - - - - - - - - - - - - - - - - - - -
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# mettre les fichiers .o dans un dossier
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# - - - - - - - - - - - - - - - - - - - -
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# - - - - - - - - - - - -
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# make un autre makefile
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# - - - - - - - - - - - -
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#
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# cependant si on veut mettre les fichiers .o dans un
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# sous-fichier BUILDS il n'y a pas de built-in pattern
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@@ -507,3 +519,16 @@ re: fclean all
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# $< = "la premiere valeur a droite de :"
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# $^ = "toutes les valeurs a droite de :"
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#
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# shape of a rule :
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#
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# target: prerequisites
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# recipe
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#
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# before executing its recipes, makefile verify if any of
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# the prerequisites has been more recently modify than
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# the target, and if so execute the recipes
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