如何处理在GNU shell扩展在Ubuntu下做什么呢？ [英] How to handle shell expansions in GNU Make under Ubuntu?

问题描述

由于这个非常简单的的Makefile ：

all:
    @mkdir -pv test/{a,b}

我得到这个操作系统输出x 10.6.8和CentOS 5.5：

I get this output on OS X 10.6.8 and CentOS 5.5:

mkdir: created directory `test'
mkdir: created directory `test/a'
mkdir: created directory `test/b'

但在Ubuntu 11.04我得到这样的：

But on Ubuntu 11.04 I get this:

mkdir: created directory `test'
mkdir: created directory `test/{a,b}'

运行命令的mkdir -pv测试/ {A，B} 在所有平台上的外壳给人手动预期的结果。

Running the command mkdir -pv test/{a,b} manually in the shell on all platforms gives the expected result.

GNU的版本做是在所有平台上是相同的：

The version of GNU Make is the same on all platforms:

GNU Make 3.81
Copyright (C) 2006  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

This program is built for [PLATFORM]

什么在Ubuntu下是不同的，为什么不shell扩展工作呢？

What's different under Ubuntu and why doesn't the shell expansion work there?

推荐答案

这个问题可能是，使鱼卵 / bin / sh的。它通常是一个符号链接到你的系统默认的shell。

The problem is probably that Make spawns /bin/sh. It is usually a symlink to your system's default shell.

您可以确保它指向bash的（因为这是一个bashism）。也许，现在是/斌/破折号或/ bin / sh的，这取决于你的Ubuntu版本。

You could make sure it points to bash (as this is a bashism). Probably, it is now /bin/dash or /bin/sh, depending on your version of Ubuntu.

更容易的选择：

SHELL=/bin/bash

all:
    @echo a{3,4}
    @bash -c 'echo a{3,4}'

本打印相同的输出两次，除非你注释掉的 SHELL = 行

This prints the same output twice unless you comment-out the SHELL= line

如果你不能/不想修改make文件，您可以调用它像这样：

If you can't/don't want to modify the make file, you can invoke it like so:

make SHELL=/bin/bash

提防与子makefile文件或包含的相互作用。你可能想看看让-e 选项和化妆导出关键字：<一href=\"http://www.gnu.org/s/hello/manual/make/Variables_002fRecursion.html\">http://www.gnu.org/s/hello/manual/make/Variables_002fRecursion.html

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