Autoreconf以"non-POSIX variable name"(非POSIX变量名)停止. [英] Autoreconf stops with "non-POSIX variable name"

问题描述

我创建了一个Makefile.in，在其中我从文件中读取内容并将其传递给CFLAGS.调用./configure ...将生成Makefile，一切正常.

I created a Makefile.in where I read the content out of a file and pass it to CFLAGS. Calling ./configure ... the Makefile will be generated an all works well.

Makefile.in: 
... 
MY_REVISION_FILE=my-revision.txt 
MY_REVISION=$(shell cat $(top_srcdir)/$(MY_REVISION_FILE)) 
AM_CFLAGS = -I$(EXTRAS_INCLUDE_DIR) -I$(top_srcdir) -DMY_REVISION=$(MY_REVISION) 
... 

一旦我将Makefile.in代码移动到Makefile.am中以允许自动生成Makefile.in，就会出现问题.在那里调用autoreconf -i --force会由于以下错误而停止:

The problem arises once I moved the Makefile.in code into Makefile.am to allow the auto generation of Makefile.in. There calling autoreconf -i --force stops with the following error:

server/Makefile.am:9: cat $(top_srcdir: non-POSIX variable name 
server/Makefile.am:9: (probably a GNU make extension) 
autoreconf: automake failed with exit status: 1 

这个问题现在已经困扰了我很长时间了.我到处搜索，但是没有找到任何可以帮助我找到解决方案的东西.简而言之，我唯一需要的是一种将未解释的文本(例如"$(shell cat $(top_srcdir)/$(MY_REVISION_FILE))")从Makefile.am复制到Makefile.in

This problem hunts me now since quite some time. I searched everywhere but did not find anything that could help me finding a solution for that. In short, the only thing I need is a way to get an uninterpreted text such as "$(shell cat $(top_srcdir)/$(MY_REVISION_FILE))" copied from Makefile.am to Makefile.in

有什么主意吗?

谢谢， 奥利弗(Oliver)

Thanks, Oliver

推荐答案

正如它所说，问题是您在Makefile.am中使用的是GNUism，而这只意味着它包含可移植的Makefile代码.

As it says, the problem is you're using a GNUism in your Makefile.am, when it's only meant to contain portable Makefile code.

要么重写您的代码，使其可移植(您应该使用AM_CPPFLAGS，因为您是将标志传递给预处理器，而不是传递给编译器):

Either rewrite your code so it's portable (you should use AM_CPPFLAGS because you're passing flags to the preprocessor, not the compiler):

AM_CPPFLAGS = -I$(EXTRAS_INCLUDE_DIR) -I$(top_srcdir) -DMY_REVISION=`cat $(top_srcdir)/$(MY_REVISION_FILE)`

如果不想在每次编译时都调用cat，则可以在configure.ac中找到该值，然后将AC_SUBST放入Makefile或AC_DEFINE中，以便将其放入config.h.

If you don't want to invoke cat on every compile, you could find the value in configure.ac and either AC_SUBST it into Makefile or AC_DEFINE it so it goes into config.h.

或者，如果您想成为非便携式(ಠ_ಠ)，则可以从AM_INIT_AUTOMAKE或AUTOMAKE_OPTIONS中取出-Werror，或添加-Wno-portability.

Or if you want to be non-portable (ಠ_ಠ), you can take -Werror out of your AM_INIT_AUTOMAKE or AUTOMAKE_OPTIONS, or add -Wno-portability.

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