make_var = I am a make variable all: # Same as running "sh_var='I am a shell variable'; echo $sh_var" in the shell sh_var='I am a shell variable'; echo $$sh_var # Same as running "echo I am a amke variable" in
Makefile是一种用于简化或组织编译代码的工具,是一组具有变量名称和目标的命令(类似于终端命令),用于创建和删除目标文件的工具。在单个 make 文件中,我们可以创建多个目标来编译和删除对象、二进制文件。您可以使用Makefile多次编译您的项目(程序)。 让我们通过一个例子来理解: 假设我们有 3 个文件main.c(主源文件...
SRC_DIRS := ./src#Find all the C and C++ files we want to compile#Note the single quotes around the * expressions. Make will incorrectlyexpandthese otherwise.SRCS := $(sort $(shell find $(SRC_DIRS) -name '*.cpp' -or -name '*.c' -or -name '*.s'))#String substitutionforevery...
space =$(nullstring)# Make a variable with a single space.all:echo"$(after)"echo start"$(space)"end An undefined variable is actually an empty string! all:# Undefined variables are just empty strings!echo$(nowhere) Use+=to append foo := start foo += moreall:echo$(foo) String Subst...
Each target specified must match the target pattern; a warning is issued for each target that does not. If you have a list of files, only some of which will match the pattern, you can use the filterfunction to remove nonmatching file names (see Functions for String Substitution and Analysis...
String Substitution The vpath Directive 自动变量 Make中有许多的自动变量,但常用的自动变量只占一小部分: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 hey: one two # Outputs "hey", since this is the first target echo$@ ...
%.o: %.c //When % appears in the dependency list, it is replaced with the same string that was used to perform substitution in the target. [TAB] command $@represent full target name of the current target. For example: Binary: main.o function.o ...
String Substitution The vpath Directive 自动变量 Make中有许多的自动变量,但常用的自动变量只占一小部分: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 hey: one two # Outputs "hey", since this is the first target echo$@ ...
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# Use an autoconf substitution vs an automake conditional here # to fool automake when the bind directory does not exist.SUBDIRS = @BINDSUBDIR@ includes tests common omapip client dhcpctl relay server DIST_SUBDIRS = $(SUBDIRS) keama nobase_include_HEADERS = dhcpctl/dhcpctl.h ...