Shulou(Shulou.com)06/02 Report--

We learned about path search in makefile earlier, so let's practice it today. Needs analysis: 1, the project does not need the source folder to be changed at compilation time (read-only folder); 2, the compilation time automatically create a folder (build) to store compilation results; 3, the compilation process can automatically search for needed files; 3, the compilation process can automatically search for needed files; 4, makefile is easy to expand, can be reused for the same type of projects; 5, support the debug version of the compilation option.

Let's take a look at the types of projects, as follows

So the tool materials we need are: a > $(wildcard $(DIR) / _ pattern) to get the files in the $(DIR) folder that satisfy _ pattern; b > $(notdir _ names) to remove the path prefix of each filename in _ names; c > $(patsubst _ pattern, replacement, _ text) to replace the part of _ text that conforms to _ pattern with replacement. The key skills are: 1, automatically get the source file list (function call): SRCS: = $(wildcard src/*.c); 2, generate the target file list according to the source file list (variable value replacement): OBJS: = $(SRCS:.c=.o); 3, replace each target file path prefix (function call): OBJS: = $(patsubst src/%, build/%, $(OBJS)). Let's look at the dependencies of the compilation rules, as shown in the following figure

Let's see how to write makefile. The src and inc folders are still the same as before.

.PHONY: all clean rebuildDIR_BUILD: = buildDIR_SRC: = srcDIR_INC: = incTYPE_INC: = .hTYPE _ SRC: = .cTYPE _ OBJ: = .oCC: = gccCFLAGS: =-I $(DIR_INC) ifeq ($(DEBUG) True) CFLAGS + =-gendifMKDIR: = rm-rfAPP: = $(DIR_BUILD) / app.outHDRS: = $(wildcard $(DIR_INC) / * $(TYPE_INC)) HDRS: = $(notdir $(HDRS)) OBJS: = $(wildcard $(DIR_SRC) / * $(TYPE_SRC)) OBJS: = $(OBJS:$ (TYPE_SRC) = $(TYPE_OBJ) OBJS: = $(patsubst $(DIR_SRC) /%, $(DIR_BUILD) /% $(OBJS)) vpath% $(TYPE_INC) $(DIR_INC) vpath% $(TYPE_SRC) $(DIR_SRC) all: $(DIR_BUILD) $(APP) @ echo "Target File = > $(APP)" $(DIR_BUILD): $(MKDIR) $@ $(APP): $(OBJS) $(CC)-o $@ $^ $(DIR_BUILD) /% $(TYPE_OBJ):% $(TYPE_SRC) $ (HDRS) $(CC) $(CFLAGS)-o $@-c $

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