在GNU Make中，如何将变量转换为小写? [英] In GNU Make, how do I convert a variable to lower case?

问题描述

这是一个愚蠢的问题，但是....使用GNU Make:

This is a silly question, but.... with GNU Make:

VAR = MixedCaseText
LOWER_VAR = $(VAR,lc)

default:
        @echo $(VAR)
        @echo $(LOWER_VAR)

在上面的示例中，将VAR的内容转换为小写的正确语法是什么?显示的语法(以及我遇到的所有其他问题)导致LOWER_VAR为空字符串.

In the above example, what's the correct syntax for converting VAR's contents to lower case? The syntax shown (and everything else I've run across) result in LOWER_VAR being an empty string.

推荐答案

您始终可以生成tr

LOWER_VAR = `echo $(VAR) | tr A-Z a-z`

或

LOWER_VAR  = $(shell echo $(VAR) | tr A-Z a-z)

您尝试调用的"lc"函数来自 GNU Make标准库

The 'lc' functions you trying to call is from GNU Make Standard Library

假设已安装，则正确的语法为

Assuming that is installed , the proper syntax would be

LOWER_VAR  = $(call lc,$(VAR))

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