比较 makefile 中的字符串变量
我的代码如下所示（如下），其中 ${IMPJAVASRC:T} 计算结果为 PJCentric.java。我想将此字符串变量与仅由字符“PJC”组成的前缀进行比较，因为还有其他具有相同前缀的模块，我想使用与以不同前缀开头的其他模块不同的 -classpath 进行编译。然而，我下面的陈述并不正确。有什么建议吗？
.if !empty(${IMPJAVASRC:T}:MPJC*) （一种方式编译） 。别的 （另一种方式编译）
I have code that looks like the following (below) where ${IMPJAVASRC:T} evaluates to PJCentric.java. I would like to compare this string variable to a prefix consisting of just the characters "PJC" since there are other modules with the same prefix which I would like to compile with a different -classpath than other modules that start with a different prefix. However, my statement below does not evaluate to true. Any suggestions?
.if !empty(${IMPJAVASRC:T}:MPJC*)
(compile one way)
.else
(compile another way)
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如果您专门使用GNU Make，例如及其条件函数 或其 控制功能。但其他
make程序不具备这种能力。然而，也存在比make更好的构建程序，例如 omake 和 Java 也有 antYou probably can do this if you use specifically GNU Make e.g. with its conditional functions or its control functions. But other
makeprograms don't give you this ability. However, there also exist better building programs thanmakesuch as omake and Java have also ant