GNU autotool:没有规则可作为目标 [英] GNU autotool:No rule to make target
问题描述
我在堆栈溢出中的第一个问题！
my first question in stack overflow!
快速概述:我使用自动工具生成C程序.当我使用 make 命令时，遇到错误:
Quick overview of my question: I use autotool to generate a C program. When I use make command, I meet the error:
No rule to make target `../lib_foo/libfoo.a', needed by `mistery_foo'. Stop.
我的问题的详细信息:
我正在做老师的作业，在该作业中，我应该使用GNU autotool 生成一个非常简单的C程序.
I am doing an assignment of my teacher, in which I should use GNU autotool to generate a very simple C program.
文件结构:/project:main，lib_foo，Makefile.am，configure.ac
File structure: /project: main, lib_foo, Makefile.am, configure.ac
/project/main:main.c，main.h，Makefile.am
/project/main: main.c, main.h, Makefile.am
/project/lib_foo:foo.c，foo.h，Makefile.am
/project/lib_foo: foo.c, foo.h, Makefile.am
以下是我为configure.ac和makefile.am编写的内容:
Following is what I write for configure.ac and makefile.am:
I."project/configure.ac" :
AC_PREREQ([2.67])
AC_INIT([project1],[0.01],[cwentai01@gmail.com])
AM_INIT_AUTOMAKE([1.9 foreign])
AC_CONFIG_SRCDIR([./lib_foo/foo.c])
AC_CONFIG_HEADERS([config.h])
AC_PROG_CC
AC_PROG_RANLIB
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <mistery.h>]],\
[[ mistery_value(1);]])],\
[AC_DEFINE([MISTERY_VALUE_ONEPARAM], [],[CONSTANT])],[])
AC_SEARCH_LIBS([mistery_value],[magic vadoo mistery],[],[AC_MSG_ERROR([Libraries (mistery, magic, vadoo) not found])])
AC_CONFIG_FILES([Makefile lib_foo/Makefile main/Makefile])
AC_OUTPUT
P.S.AC_COMPLIE_IFELSE用于判断函数mistery_value()中参数的数量.我认为这与错误无关.
P.S. the AC_COMPLIE_IFELSE is used to judge the number of the parameters in function mistery_value(). I think it has nothing to do with the error.
II. project/Makefile.am :
SUBDIRS = main lib_foo
III. project/main/Makefile.am
LDADD = ../lib_foo/libfoo.a
mydir = ../uselessbin
my_PROGRAMS = mistery_foo
mistery_foo_SOURCES = main.c main.h
mistery_foo_LDADD = ../lib_foo/libfoo.a
IV. project/lib_foo/Makefile.am
noinst_LIBRARIES = libfoo.a
libfoo_a_SOURCES = foo.c foo.h
然后按命令顺序运行:
>cd project
> aclocal
> autoheader
> automake -a
> autoconf
> ./configure
> make
> make install
> ./uselessbin/mistery_foo
当我运行 make 命令时，出现错误:
When I run make command, I got the error:
No rule to make target `../lib_foo/libfoo.a', needed by `mistery_foo'. Stop.
我想问题可能是我没有正确安装 libfoo.a .但是库 libfoo.a 不应安装，而只能编译，因此我必须在lib_foo/Makefile.am中使用'noinst_'.这就是为什么我被困在这里.
I suppose the problem may be that I don't have libfoo.a properly installed. But the library libfoo.a should not be installed but only compiled so I have to use 'noinst_' in lib_foo/Makefile.am. That's why I get stucked here.
任何答案将不胜感激.感谢您的帮助！
Any answers will be appreciated. Thanks for your help!
推荐答案
问题是您使用的是递归自动制作，在这种情况下，跨越目录路径的依赖项将无法解析为其他规则: main/Makefile.am 不知道如何在 lib_foo 中创建目标.
The problem is that you're using recursive automake, and in this case, dependencies crossing directory paths will just not resolve to extra rules: main/Makefile.am does not know how to make targets in lib_foo.
快速解决方法是将顶级 Makefile.am 中的 SUBDIRS 声明更改为:
The quick fix up is to change your SUBDIRS declaration in the top-level Makefile.am to:
SUBDIRS = lib_foo main
这样，仅在构建 lib_foo 及其目标之后，才能构建 main/mystery_foo .当然，这不允许您仅在 main/中进行 make 并使之起作用.
This way main/mystery_foo will only be built after lib_foo and its targets are built. Of course this does not allow you to just make in main/ and have it work.
上一篇文章中的另一个建议是使用非递归自动制作正确的解决方案，因为这样就可以从单个 Makefile.am 中解析所有依赖项.
The other suggestion from the previous post, to use non-recursive automake is a more proper solution, because then all the dependencies can be resolved from a single Makefile.am.
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