1.autoscan (autoconf): 掃描源代碼以搜尋普通的可移植性問題,比如檢查編譯器,庫,頭文件等,生成文件configure.scan,它是configure.ac的一個雛形。
your source files --> [autoscan*] --> [configure.scan] --> configure.ac
2.aclocal (automake):根據已經安裝的宏,用戶定義宏和acinclude.m4文件中的宏將configure.ac文件所需要的宏集中定義到文件 aclocal.m4中。aclocal是一個perl 腳本程序,它的定義是:“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): 根據configure.ac中的某些宏,比如cpp宏定義,運行m4,聲稱config.h.in user input files optional input process output files ================ ============== ======= ============ aclocal.m4 - - - - - - - . | V .----------, configure.ac ----------------------->|autoheader|----> autoconfig.h.in `----------'
4.automake: automake將Makefile.am中定義的結構建立Makefile.in,然後configure腳本將生成的Makefile.in文件轉換爲Makefile。如果在configure.ac中定義了一些特殊的宏,比如AC_PROG_LIBTOOL,它會調用libtoolize,否則它會自己產生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:將configure.ac中的宏展開,生成configure腳本。這個過程可能要用到aclocal.m4中定義的宏。
user input files optional input processes output files ================ ============== ========= ============ aclocal.m4 ,autoconfig.h.in - - - - - - -. V .--------, configure.ac ----------------------->|autoconf|------> configure
6. ./configure的過程
.-------------> [config.cache] configure* --------------------------+-------------> config.log | [config.h.in] -. v .--> [autoconfig.h]
+-------> config.status* -+ Makefile.in ---' `--> Makefile
7. make過程
[autoconfig.h] -.
+--> make* ---> 程序
Makefile ---'
.---------, config.site - - ->| | config.cache - - ->| | - - -> 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 ------>| | {project sources} ---------------->| |--------> {project targets} .-+ +--, | `--------' | | libtool | | missing | | install-sh | |mkinstalldirs| `-------------'