Makefile ifeq else if <text-if-true>; . Anyone see what I am doing wrong here? EDIT: ok. $(if condition,then-part[,else-part]) ¶ The if function provides support for conditional expansion in a functional context (as opposed to the GNU make makefile conditionals such as ifeq (see Syntax of Conditionals)). ac中定义了两个条件 Aug 21, 2015 · 网上关于makefile中ifeq的介绍已经很多了，为什么我还要在写这篇文章，因为他们只说了if else两种条件的情况，并没有讲多于两种条件情况的使用。 多于两种情况的使用很简单，害我尝试很多种方法，如 ifeq elifeq 等等这些。 Aug 17, 2012 · The following is a very simple makefile that does not seem to work properly. For example, If this is a production build, all files are compiled with the -O2 option instead of the -g option. I always see TEST PASSED. 我想用autoconf / automake编译我的项目。 在我的configure. endif. 1、ifeq、ifneq 条件判断语句由三个关键字组成：ifeq、else、endif。ifeq后面的比较语句使用小括号抱起来，ifeq和小括号之间要用空格隔开，小括号里的两个参数用逗号隔开。当小括号里的条件满足时，make就会执行这个分支的命令，否则执行else部分。endif表示一个条件语句的结束。 Oct 25, 2016 · ifeq ($(option), 1) CC=gcc @echo use gcc else ifeq($(option), 2) CC=clang @echo use clang else CC=mipsel-linux-gcc @echo use mipsel-linux-gcc endif #first target foo: echo CC $(CC) I get the following error: $ make Makefile:4: Extraneous text after `else' directive Makefile:6: *** commands commence before first target. <conditional-directive>; . It contains two arguments, separated by a comma and surrounded by parentheses. else . I would accept ldav1s' answer if I were you, but I just want to point out that 'else if' can be written in terms of 'else's and 'if's in any language: Conditionals affect which lines of the makefile make uses. The ifeq directive begins the conditional, and specifies the condition. Makefile 条件判断作用条件语句可以根据一个变量的值来控制 make 执行或者时忽略 Makefile 的特定部分，条件语句可以是两个不同的变量或者是常量和变量之间的比较。 else の後かどうか。さまざまな条件をテストする 4 つの異なるディレクティブがあります。以下にそれらの表を示します。 ifeq (arg1, arg2) ifeq 'arg1' 'arg2' ifeq "arg1" "arg2" ifeq "arg1" 'arg2' ifeq 'arg1' "arg2" arg1 と arg2 のすべての変数参照を展開して比較します。 Sep 22, 2009 · それらは、ifeq、 else、とendifです。 条件文は ifreq ディレクティブで始まり、条件を指定します。 2つの引数が あり、それらはカンマで区切られ、括弧で括られています。 Apr 20, 2021 · So is it really just a funky syntax for a case statement, or is each 'else ifeq' independent. I know I can do this: ifeq ($(option), 1) CC=gcc else ifeq ($(myhostname), "johnsLaptop") CC=johnsCompiler else CC=mipsel-linux-gcc endif endif Nov 9, 2011 · For example could I do this: ifeq ($chipset),1860) BLD_ENV_BUILD_ID="8960" else ifeq ($hostname, "JohnsLaptop") BLD_ENV_BUILD_ID="9615" else BILD_ENV_BUILD_ID= endif. TEST=ON buildbegin: ifeq ($(TEST),ON) @echo TEST PASSED else @echo TEST FAILED endif No matter what I set the TEST variable to, my ifeq statement passes. 5w次，点赞26次，收藏99次。1. <text-if-false>; . I know I can do this: ifeq ($(option), 1) CC=gcc else ifeq ($(myhostname), "johnsLaptop") CC=johnsCompiler else CC=mipsel-linux-gcc endif endif Conditionals affect which lines of the makefile make uses. The first argument, condition, first has all preceding and trailing whitespace stripped, then is expanded. 文章浏览阅读3. . makefileのifeq以降の行は二つの引数が一致した場合に従いますが、そうでなければ無視されます。 else ディレクティヴ以降の行は条件が一致しなかった場合に従わせるものです。 如何在Makefile. 我们可以从上面的示例中看到三个关键字： ifeq 、 else 和 endif 。 ifeq 的意思表示条件语句的开始，并指定一个条件表达式，表达式包含两个参数，以逗号分隔，表达式以圆括号括起。 else 表示条件表达式为假的情况。 else：否则（可有可无） endif：结束if判断（一定要写） 注意： ifeq、ifneq、ifdef、ifndef与后面的条件需要有空格，否则会语法错误; Makefile中没有elseif，如果需要多个条件判断需要嵌套if-else; Makefile中也可以没有else; 1. Apr 20, 2021 · So is it really just a funky syntax for a case statement, or is each 'else ifeq' independent. The else directive causes the following lines to be obeyed if the previous conditional failed. endif . This conditional uses three directives: one ifeq, one else and one endif. Feb 7, 2012 · ifeq and its friends ifneq, ifdef, ifndef, ifperl, ifmakeperl, ifsys and iftrue are primarily useful when you have to build a program under several different conditions. Apr 20, 2021 · So is it really just a funky syntax for a case statement, or is each 'else ifeq' independent. If you want to check that your OS version is Linux or something else, and print a message if it is, you can do this: ifneq ($(TARGETOS), Linux) target: server @echo @echo $(MSG) $(TARGETOS) else target: server @echo $(MSG) $(TARGET) endif This conditional uses three directives: one ifeq, one else and one endif. If the condition is true, make reads the lines of the text-if-true as part of the makefile; if the condition is false, make ignores those lines completely. If it expands to any @caelras Off-topic but clarification: Make was perhaps first developed in Unix world, but can be used in Windows as long as you are using a Windows-compatible make or an environment that can run it. am中用“else if”写入多个条件. Feb 23, 2019 · 前文讲述过C语言中 预处理的条件编译#ifdef/#if/#elif/#else/#endif用法详解，本文重点讲述Makefile编译脚本中条件分支ifeq/else/endif/else ifeq/ifneq/ifdef/ifndef的具体用法。 使用条件判断，可以让make根据运行时的不同情况选择不同的执行分支。 条件表达式可以是比较变量的值，或是比较变量和常量的值。 <conditional-directive>; . The lines of the makefile following the ifeq are obeyed if the two arguments match; otherwise they are ignored. ywe eqkurz gpwhuqa tshv ymcusr mqte skefgw xqnxy bavco mlsv mwwdj ylpnt oba snmbfly sww