so if i input make all, then the makefile will execute the all target firstly?
时间: 2024-05-31 19:12:46 浏览: 21
Yes, that's correct! If you run the command `make all`, the Makefile will execute the commands associated with the `all` target first. The `all` target is usually used to specify all the targets that should be built when the user types `make` without any arguments.
相关问题
all: $(IMAGE_BIN) $(STR_BIN) so will makefile execute to output $(IMAGE_BIN) and $(STR_BIN) firstly, and then execute the commands of all?
Yes, that is correct. The makefile will execute the commands to generate $(IMAGE_BIN) and $(STR_BIN) first, and then move on to execute the commands under "all". The "all" target depends on $(IMAGE_BIN) and $(STR_BIN), so make will ensure that these targets are built before executing the commands under "all".
what is the usage of $(if) in makefile?
In Makefile, $(if) is a conditional function that allows you to test if a condition is true or false. It has the following syntax:
```
$(if condition,then-part[,else-part])
```
If the condition is true, the function returns the then-part, otherwise, it returns the else-part. The else-part is optional and can be omitted.
Here's an example of how to use $(if) in a Makefile:
```
ifeq ($(DEBUG), true)
CFLAGS = -g -Wall
else
CFLAGS = -O2
endif
$(CC) $(CFLAGS) -o program program.c
```
In this example, the $(if) function is not used directly, but the ifeq directive is used to test the condition $(DEBUG) which is either true or false. If it's true, the CFLAGS variable is set to include debugging symbols and warnings, otherwise, it's set to optimize the code. The resulting CFLAGS value is then used to compile the program.c file.
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