我正在寻找编写一个 makefile 来自动编译我正在处理的项目,其中文件的数量可能会或可能不会改变。我还需要能够快速告诉 make 将文件编译为调试版本或发布版本(由命令行定义区分)。经过一番研究,我发现了模式规则并做了一个。这是我到目前为止的代码:
# Our folders
# ODIR - The .o file directory
# CDIR - The .cpp file directory
# HDIR - The .hpp file directory
ODIR = obj
CDIR = src
HDIR = inc
# Get our compiler and compiler commands out of the way
# CC - Our compiler
# CFNO - Our compiler flags for when we don't have an output file
# CF - Our compiler flags. This should be appended to any compile and should
# have the name of the output file at the end of it.
# OF - Object flags. This should be appended to any line that is generating
# a .o file.
CC = g++
CFNO = -std=c++11 -wall -Wno-write-strings -Wno-sign-compare -lpaho-mqtt3c -pthread -O2 -I$(HDIR)
CF = $(CFNO) -o
OF = -c
# Our project/output name
NAME = tls_test
# Set out Debug and Release settings, as well as any defines we will use to identify which mode we are in
# NOTE: '-D[NAME OF DEFINE]' is how you create a define through the compile commands
DEBUG = -DDEBUG -g
RELEASE = -DRELEASE
# Our two compile modes
# eval allows us to create variables mid-rule
debug:
$(eval DR = $(DEBUG))
release:
$(eval DR = $(RELEASE))
# Our compiling commands
all:
$(CC) $(CF) $(NAME) $(ODIR)/*.o
# NOTE: $@ is the end product being created and $< is the first of the prerequisite
$(ODIR)/%.o: $(CDIR)/%.c
echo "$(CC) $(DR) $(OF) $(CF) $@ $<"
我遇到的问题是我需要运行的顺序。命令行调用应该告诉 make 使用 debug 或 release,它设置一个 make 变量,然后调用 all。 all 然后应该在运行 all 规则中当前的行之前运行底部的模式规则。那么,如何使模式规则成为依赖项,以及如何从另一个规则调用规则?
最佳答案
使用特定于目标的变量
虽然不是绝对必要的,但分离你的标志对管理构建选项大有帮助,然后你可以使用 target-specific variable附加以切换标志。当您使用它时,您不妨使用内置变量名称。
我还添加了依赖项生成 ( -MMD -MP
),因为它总是很有用。
ODIR := obj
CDIR := src
HDIR := inc
SRCS := $(wildcard $(CDIR)/*.cpp)
OBJS := $(SRCS:$(CDIR)/%.cpp=$(ODIR)/%.o)
DEPS := $(OBJS:%.o=%.d)
CPPFLAGS := -I$(HDIR) -MMD -MP
CXXFLAGS := -std=c++11 -Wall -Wno-write-strings -Wno-sign-compare -pthread -O2
LDFLAGS := -pthread
LDLIBS := -lpaho-mqtt3c
NAME := tls_test
.PHONY: debug release clean
debug: CPPFLAGS+=-DDEBUG
debug: CXXFLAGS+=-g
release: CPPFLAGS+=-DRELEASE
debug release: $(NAME)
$(NAME): $(OBJS)
$(CXX) $(LDFLAGS) $^ $(LDLIBS) -o $@
$(OBJS): $(ODIR)/%.o: $(CDIR)/%.cpp
$(CXX) $(CXXFLAGS) $(CPPFLAGS) -c $(OUTPUT_OPTION) $<
clean: ; $(RM) $(NAME) $(OBJS) $(DEPS)
-include $(DEPS)
关于makefile - 如何在 makefile 中的另一个规则中运行模式规则?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36902684/