有没有办法告诉automake不要解释automakefile的一部分? [英] Is there a way to tell automake not to interpret part of the automakefile?

问题描述

有没有办法告诉自动制作不要解释Makefile.am的一部分?

Is there a way to tell automake not to interpret part of the Makefile.am?

具体来说，我正在尝试在Makefile.am中对有条件的Makefile进行编码.正如其他人所注意到的那样，这是行不通的，因为automake会解释endif构造.

Specifically, I am trying to encode a Makefile conditional in a Makefile.am. As other people have noticed, this doesn't work because automake interprets the endif construct.

是否有任何方法可以转义或引用Makefile.am文件中的字符串，以便自动制作将它们原样复制到目标Makefile中?具体来说，我不希望它以如下形式解释endif:

Is there any way to escape or quote strings in Makefile.am files so that automake copies them verbatim into the destination Makefile? Specifically I don't want it to interpret the endif in something like:

ifeq "$(SOMEVAR)" ""
SOMEVAR="default_value"
endif

推荐答案

自动制作有条件的原因是因为某些恐龙没有制作.也就是说，如果您确实必须执行此操作，则可以将代码段定义为configure.ac中的变量，并将AC_SUBST定义为Makefile中的变量.这样，自动制作将没有机会看到它.请记住使用AM_SUBST_NOTMAKE以避免创建类似FOO = @FOO@的行.)

The reason automake does conditionals is because some dinosaur makes don't. That said, if you really must do this, you could define your snippet as a variable in configure.ac and AC_SUBST it into your Makefile. That way, automake won't get a chance to see it. Remember to use AM_SUBST_NOTMAKE to avoid creating a line like FOO = @FOO@.)

dnl In configure.ac:
snippet='
ifeq ($(somevar),Y)
foo
endif
'
AC_SUBST([snippet])
AM_SUBST_NOTMAKE([snippet])

和:

## In Makefile.am:
@snippet@

我真诚地希望有比这更好的方法.

I sincerely hope there's a better way than this.

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