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。
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 - - - - - -.
V
.--------,
configure.ac ----------------------->|autoconf|------> configure ----->autoconfig.h,Makefile
[root@zieckey autoconf]# mkdir hello
[root@zieckey autoconf]# cd hello/
[root@zieckey hello]# vi hello.c
[root@zieckey hello]# ls
hello.c
[root@zieckey hello]# autoscan
[root@zieckey hello]# ls
autoscan.log configure.scan hello.c
[root@zieckey hello]# mv configure.scan configure.in
[root@zieckey hello]# ls
autoscan.log configure.in hello.c
主要是修改 AC_INIT
添加 AM_INIT_AUTOMAKE(hello, 1.0)
如果不需要 config.h 就删除者一行 AC_CONFIG_HEADER([config.h])
[root@zieckey hello]# cat configure.in
AC_PREREQ(2.61)
AC_INIT(hello, 1.0, bug-318 )
AM_INIT_AUTOMAKE(hello, 1.0)
AC_CONFIG_SRCDIR(hello.c)
AC_PROG_CC
AC_OUTPUT(Makefile)
[root@zieckey hello]# ls
autoscan.log configure.in hello.c
[root@zieckey hello]# aclocal
[root@zieckey hello]# autoconf
[root@zieckey hello]# ls
aclocal.m4 autom4te.cache autoscan.log configure configure.in hello.c
[root@zieckey hello]# vi Makefile.am
[root@zieckey hello]# cat Makefile.am
AUTOMAKE_OPTIONS=foreign
bin_PROGRAMS=hello
hello_SOURCES=hello.c
[root@zieckey hello]# ls
Makefile.am aclocal.m4 autom4te.cache autoscan.log configure configure.in hello.c
[root@zieckey hello]# automake --add-missing
configure.in:3: installing `./missing'
configure.in:3: installing `./install-sh'
Makefile.am: installing `./depcomp
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