makefile的if语句makefile的if语句 Makefile是用于编译、链接和构建软件的工具,它使用一种特殊的语法来描述编译过程中的依赖关系和命令。在Makefile中,我们可以使用if语句来进行条件判断,根据不同的条件执行不同的命令。下面是关于Makefile中if语句的一些例子: 1. 判断操作系统类型: ```makefile ifeq ($(shell ...
"@echo$(bar) if函数 if检查第一个参数是否为非空。如果是,则运行第二个参数,否则运行第三个。 foo :=$(ifthis-is-not-empty,then!,else!)empty := bar :=$(if$(empty),then!,else!)all:
⼀、参考⽂档：1. Test whether a directory exists inside a makefile https://stackoverflow.com/questions/20763629/test-whether-a-directory-exists-inside-a-makefile ⼆、解决办法：if a shell command, must be in one line, or be on multiple lines using a backslash for line extension.
all: one two three four# Fails, because $(thing_wrong) is the string "*.o"one: $(thing_wrong)# Stays as *.o if there are no files that match this pattern :(two: *.o# Works as you would expect! In this case, it does nothing.three: $(thing_right)# Same as rule threefour:...
inherit-product-if-exists先判断文件是否存在。 inherit-product 函数的定义位于 build/core/product.mk 文件中,如下: ## $(1): product to inherit## Does three things:# 1. Inherits all of the variables from $1.# 2. Records the inheritance in the .INHERITS_FROM variable# 3. Records that we'...
# Overridedefaultsettingsifpossible-include.make-settings # 最终的编译选项CFLAGS是-c的选项,LDFLAGS是链接的选项FINAL_CFLAGS=$(STD)$(WARN)$(OPT)$(DEBUG)$(CFLAGS)$(REDIS_CFLAGS)FINAL_LDFLAGS=$(LDFLAGS)$(REDIS_LDFLAGS)$(DEBUG)FINAL_LIBS=-lmDEBUG=-g-ggdb ...
The preferred name for the kbuild files are 'Makefile' but 'Kbuild' can be used and if both a 'Makefile' and a 'Kbuild' file exists, then the 'Kbuild' file will be used. 内核中大多数makefile文件是使用kbuild基础架构的makefile文件.本章介绍 kbuild的makefile中的语法. Kbuild文件倾向于"Mak...
The if function The call function The shell function The filter function Other Features Include Makefiles The vpath Directive Multiline .phony .delete_on_error Makefile Cookbook one=this will only work locallytwo=we can run subcommands with thisall:@echo$(one)@echo $$one @echo$(two)@echo ...
# exists on the build machine. When building # a chroot, PREFIX if just a directory which # later becomes /. DOCUMENT_ROOT = $(HTMLDIR) PORTS = 8080 USE_STACK_SIZE ?= 102400 BUILD_DIRS = $(BUILD_DIR) $(BUILD_DIR)/src $(BUILD_DIR)/resources LIB_SOURCES = src/civetweb....
check-microk8s: ## Validate if microk8s is ready to install cilium.@$(ECHO_CHECK) microk8s is ready... $(QUIET)microk8s.status >/dev/null \ || (echo "Error: Microk8s is not running" && exit 1) LOCAL_IMAGE_TAG=local microk8s: export DOCKER_REGISTRY=localhost:32000 microk8s:...