Configure,Makefile.am, Makefile.in, Makefile文件之间关系

1.autoscan (autoconf): 扫描源代码以搜寻普通的可移植性问题,比如检查编译器,库,头文件等,生成文件configure.scan,它是configure.ac的一个雏形。

    your source files --> [autoscan*] --> [configure.scan] --> configure.ac

2.aclocal (automake):根据已经安装的宏,用户定义宏和acinclude.m4文件中的宏将configure.ac文件所需要的宏集中定义到文件 aclocal.m4中。aclocal是一个perl 脚本程序,它的定义是:“aclocal - create aclocal.m4 by scanning configure.ac”
user input files   optional input     process          output files

================   ==============     =======          ============



                    acinclude.m4 - - - - -.

                                          V

                                      .-------,

configure.ac ------------------------>|aclocal|

                 {user macro files} ->|       |------> aclocal.m4

                                      `-------'

3.autoheader(autoconf): 根据configure.ac中的某些宏,比如cpp宏定义,运行m4,声称config.h.in



user input files    optional input     process          output files

================    ==============     =======          ============



                    aclocal.m4 - - - - - - - .

                                             |

                                             V

                                     .----------,

configure.ac ----------------------->|autoheader|----> autoconfig.h.in

                                     `----------'

4.automake: automake将Makefile.am中定义的结构建立Makefile.in,然后configure脚本将生成的Makefile.in文件转换 为Makefile。如果在configure.ac中定义了一些特殊的宏,比如AC_PROG_LIBTOOL,它会调用libtoolize,否则它 会自己产生config.guess和config.sub

user input files   optional input   processes          output files

================   ==============   =========          ============



                                     .--------,

                                     |        | - - -> COPYING

                                     |        | - - -> INSTALL

                                     |        |------> install-sh

                                     |        |------> missing

                                     |automake|------> mkinstalldirs

configure.ac ----------------------->|        |

Makefile.am  ----------------------->|        |------> Makefile.in

                                     |        |------> stamp-h.in

                                 .---+        | - - -> config.guess

                                 |   |        | - - -> config.sub

                                 |   `------+-'

                                 |          | - - - -> config.guess

                                 |libtoolize| - - - -> config.sub

                                 |          |--------> ltmain.sh

                                 |          |--------> ltconfig

                                 `----------'

5.autoconf:将configure.ac中的宏展开,生成 configure脚本。这个过程可能要用到aclocal.m4中定义的宏。

user input files   optional input   processes          output files

================   ==============   =========          ============



aclocal.m4 ,autoconfig.h.in - - - - - - -.

                                         V

                                     .--------,

configure.ac ----------------------->|autoconf|------> configure
 
6. ./configure的过程
                                           .-------------> [config.cache]

     configure* --------------------------+-------------> config.log

                                          |

              [config.h.in] -.            v            .--> [autoconfig.h]

                             +-------> config.status* -+                   

              Makefile.in ---'                         `-->   Makefile
 
7. make过程
 
[autoconfig.h] -.

                     +--> make* --->  程序

        Makefile   ---'
 
.---------,

                   config.site - - ->|         |

                  config.cache - - ->|<strong><span>configure</span>
</strong>
| - - -> config.cache

                                     |         +-,

                                     `-+-------' |

                                       |         |----> config.status

                   config.h.in ------->|config-  |----> config.h

                   Makefile.in ------->|  .status|----> Makefile

                                       |         |----> stamp-h

                                       |         +--,

                                     .-+         |  |

                                     | `------+--'  |

                   ltmain.sh ------->|ltconfig|-------> libtool

                                     |        |     |

                                     `-+------'     |

                                       |config.guess|

                                       | config.sub |
`------------'

 

.--------,

                   Makefile ------>|        |

                   config.h ------>|  make

  |

{project sources} ---------------->|        |--------> {project targets}

                                 .-+        +--,

                                 | `--------'  |

                                 |   libtool   |

                                 |   missing   |

                                 |  install-sh |

                                 |mkinstalldirs|

                                 `-------------'

实例 :
在/hello/目录下创建一个hello.c文件,并编译运行它:

#cd /hello/

(1) 编写源文件hello.c:

#include<stdio.h> 
int main(int argc, char** argv)
{
printf("Hello, GNU!n");
return 0;
}

[litao@vm0000131 hello]$ ll
total 4
-rw-rw-r-- 1 litao litao 68 Aug 12 12:02 hello.c

一、autoscan

[litao@vm0000131 hello]$ autoscan 
autom4te: configure.ac: no such file or directory
autoscan: /usr/bin/autom4te failed with exit status: 1
[litao@vm0000131 hello]$ ll
total 8
-rw-rw-r-- 1 litao litao   0 Aug 12 12:03 autoscan.log
-rw-rw-r-- 1 litao litao 457 Aug 12 12:03 configure.scan
-rw-rw-r-- 1 litao litao  68 Aug 12 12:02 hello.c

已经生成了configure.scan,autoscan.log文件

将configure.scan 修改为 configure .in, 最后修改的内容如下:

[litao@vm0000131 hello]$ mv configure.scan configure.in     
[litao@vm0000131 hello]$ vim configure.in 

#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ(2.59)
AC_INIT(FULL-PACKAGE-NAME, VERSION, BUG-REPORT-ADDRESS)
AC_CONFIG_SRCDIR([hello.c])
#AC_CONFIG_HEADER([config.h])
AM_INIT_AUTOMAKE(hello, 1.0)
# Checks for programs.
AC_PROG_CC

# Checks for libraries.

# Checks for header files.

# Checks for typedefs, structures, and compiler characteristics.

# Checks for library functions.
AC_OUTPUT(Makefile)

二、acloacl 

[litao@vm0000131 hello]$ aclocal 

生成 aclocal.m4 和 autom4te.cache (生成aclocal.m4的过程中涉及到configure.in)

[litao@vm0000131 hello]$ ll
total 44
-rw-rw-r-- 1 litao litao 31120 Aug 12 12:08 aclocal.m4
drwxr-xr-x 2 litao litao  4096 Aug 12 12:08 autom4te.cache
-rw-rw-r-- 1 litao litao     0 Aug 12 12:03 autoscan.log
-rw-rw-r-- 1 litao litao   496 Aug 12 12:08 configure.in
-rw-rw-r-- 1 litao litao    68 Aug 12 12:02 hello.c

三、antoconf

[litao@vm0000131 hello]$ autoconf
生成 configure (根据 configure .in, 和 aclocal.m4) 

[litao@vm0000131 hello]$ ll
total 168
-rw-rw-r-- 1 litao litao  31120 Aug 12 12:08 aclocal.m4
drwxr-xr-x 2 litao litao   4096 Aug 12 12:11 autom4te.cache
-rw-rw-r-- 1 litao litao      0 Aug 12 12:03 autoscan.log
-rwxrwxr-x 1 litao litao 122297 Aug 12 12:11 configure
-rw-rw-r-- 1 litao litao    496 Aug 12 12:08 configure.in
-rw-rw-r-- 1 litao litao     68 Aug 12 12:02 hello.c

四、编写Makefile.am:

AUTOMAKE_OPTIONS= foreign
bin_PROGRAMS= hello
hello_SOURCES= hello.c

五、automake

生成 Makefile.in, depcomp, install-sh, 和 missing (根据 Makefile.am, 和 aclocal.m4)

[litao@vm0000131 hello]$ automake 
configure.in: required file `./install-sh' not found
configure.in: required file `./missing' not found
Makefile.am: required file `./depcomp' not found
[litao@vm0000131 hello]$ automake --add-missing 
configure.in: installing `./install-sh'
configure.in: installing `./missing'
Makefile.am: installing `./depcomp'
[litao@vm0000131 hello]$ ll
total 192
-rw-rw-r-- 1 litao litao  31120 Aug 12 12:08 aclocal.m4
drwxr-xr-x 2 litao litao   4096 Aug 12 12:14 autom4te.cache
-rw-rw-r-- 1 litao litao      0 Aug 12 12:03 autoscan.log
-rwxrwxr-x 1 litao litao 122297 Aug 12 12:11 configure
-rw-rw-r-- 1 litao litao    496 Aug 12 12:08 configure.in
lrwxrwxrwx 1 litao litao     31 Aug 12 12:16 depcomp -> /usr/share/automake-1.9/depcomp
-rw-rw-r-- 1 litao litao     68 Aug 12 12:02 hello.c
lrwxrwxrwx 1 litao litao     34 Aug 12 12:16 install-sh -> /usr/share/automake-1.9/install-sh
-rw-rw-r-- 1 litao litao     69 Aug 12 12:15 Makefile.am
-rw-rw-r-- 1 litao litao  16561 Aug 12 12:16 Makefile.in
lrwxrwxrwx 1 litao litao     31 Aug 12 12:16 missing -> /usr/share/automake-1.9/missing

六、configure
生成 Makefile, config.log, 和 config.status

 

Summarize:

如果拿到的工程文件中,没有Makefile文件,而只有configure.in和Makefile.am文件,我们是不能够直接进行编译的,必须根据configure.in和Makefile.am文件生成编译所需的Makefile文件。具体操作步骤如下:

    1、执行aclocal,产生aclocal.m4文件
    aclocal是一个perl 脚本程序,它的定义是:“aclocal - create aclocal.m4 by scanning configure.ac”。aclocal根据configure.in文件的内容,自动生成aclocal.m4文件。而aclocal.m4文件中,包含了生成configure文件所必须的宏。
    2、执行autoconf,生成configure文件
    autoconf会根据configure.in和aclocal.m4文件,生成configure文件。其实,autoconf就是把configure.in和aclocal.m4文件中定义的内容,变成检查系统特性、环境变量、软件必须的参数的shell脚本。
    3、执行automake命令,产生Makefile.in
    具体命令为:automake --add-missing
automake会根据Makefile.am文件产生一些文件,包含最重要的Makefile.in。前面所生成的configure,会根据Makefile.in文件,来生成最终的Makefile文件。
    4、执行configure命令,生成Makefile文件
    这样,就产生了编译所需要的Makefile文件。运行make,即可编译。
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