一步步实现windows版ijkplayer系列文章之一——Windows10平台编译ffmpeg 4.0.2，生成ffplay一步步实现windows版ijkplayer系列文章之二——Ijkplayer播放器源码分析之音视频输出——视频篇一步步实现windows版ijkplayer系列文章之三——Ijkplayer播放器源码分析之音视频输出——音频篇一步步实现windows版ijkplayer系列文章之四——windows下编译ijkplyer版ffmpeg一步步实现windows版ijkplayer系列文章之五——使用automake一步步生成makefile
上一篇文章我们把ffmpeg库成功在windows平台下编译成dll了，ffmpeg的编译方案是跨平台的，直接使用它的现成的configure文件用于生成makefile,但是ijkplayer的另外两个库ijkplayer和ijksdl只支持android和IOS平台，因此在windows平台的编译需要自己实现，我们打算使用automake，先熟悉一下，从网络搜罗了两个例子，在自己的环境里面一步步成功生成了makefile，其中有些坑，现在将这些步骤记录下来。
平台 windows mingw
autoconf 版本：2.68
automake版本：1.11.1
创建文件夹hello，进入文件夹后编辑一个简单的hello.c文件
#include <stdio.h> int main(int argc, char** argv) { printf("Hello, automake!\n"); return 0; }手动创建Makefile.am，內容如下:
AUTOMAKE_OPTIONS= foreign bin_PROGRAMS= hello hello_SOURCES= hello.c执行autoscan，目录变化如下：
$ ls -l total 2 drwxr-xr-x 2 zexu Administrators 0 Oct 20 12:14 autom4te.cache -rw-r--r-- 1 zexu Administrators 0 Oct 20 12:14 autoscan-2.68.log -rw-r--r-- 1 zexu Administrators 495 Oct 20 12:14 configure.scan -rw-r--r-- 1 zexu Administrators 100 Oct 18 07:46 hello.c看一下configure.scan的内容：
# -*- Autoconf -*- # Process this file with autoconf to produce a configure script. AC_PREREQ([2.68]) AC_INIT([FULL-PACKAGE-NAME], [VERSION], [BUG-REPORT-ADDRESS]) AC_CONFIG_SRCDIR([hello.c]) AC_CONFIG_HEADERS([config.h]) # 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_CONFIG_FILES([Makefile]) AC_OUTPUT将此文件重命名为configure.in，执行autolocal,autoconf，生成configure：
$ ls -lh total 111K drwxr-xr-x 2 zexu Administrators 0 Oct 20 12:29 autom4te.cache -rw-r--r-- 1 zexu Administrators 0 Oct 20 12:14 autoscan-2.68.log -rwxr-xr-x 1 zexu Administrators 109K Oct 20 12:29 configure -rw-r--r-- 1 zexu Administrators 495 Oct 20 12:14 configure.in -rw-r--r-- 1 zexu Administrators 100 Oct 18 07:46 hello.c执行如下automake命令:
$ automake --add-missing configure.in: no proper invocation of AM_INIT_AUTOMAKE was found. configure.in: You should verify that configure.in invokes AM_INIT_AUTOMAKE, configure.in: that aclocal.m4 is present in the top-level directory, configure.in: and that aclocal.m4 was recently regenerated (using aclocal). configure.in:7: required file `config.h.in' not found Makefile.am: installing `./depcomp' /mingw/share/automake-1.11/am/depend2.am: am__fastdepCC does not appear in AM_CONDITIONAL /mingw/share/automake-1.11/am/depend2.am: The usual way to define `am__fastdepCC' is to add `AC_PROG_CC' /mingw/share/automake-1.11/am/depend2.am: to `configure.in' and run `aclocal' and `autoconf' again. /mingw/share/automake-1.11/am/depend2.am: AMDEP does not appear in AM_CONDITIONAL /mingw/share/automake-1.11/am/depend2.am: The usual way to define `AMDEP' is to add one of the compiler tests /mingw/share/automake-1.11/am/depend2.am: AC_PROG_CC, AC_PROG_CXX, AC_PROG_CXX, AC_PROG_OBJC, /mingw/share/automake-1.11/am/depend2.am: AM_PROG_AS, AM_PROG_GCJ, AM_PROG_UPC /mingw/share/automake-1.11/am/depend2.am: to `configure.in' and run `aclocal' and `autoconf' again.看到出错了，在configure.in中添加如下信息：
AM_INIT_AUTOMAKE([-Wall -Werror foreign])再次执行aclocal,autoconf和automake
zexu@DESKTOP-R4T030U ~/devel/hello $ aclocal zexu@DESKTOP-R4T030U ~/devel/hello $ autoconf $ automake --add-missing configure.in:9: installing `./install-sh' configure.in:9: installing `./missing' configure.in:7: required file `config.h.in' not found执行autoheader，生成头文件后再次automake，最后成功，可见没有任何无误提示。
zexu@DESKTOP-R4T030U ~/devel/hello $ automake --add-missing最后执行configure，生成Makefile文件:
zexu@DESKTOP-R4T030U ~/devel/hello $ ./configure执行make，生成hello.exe:
zexu@DESKTOP-R4T030U ~/devel/hello $ make make all-am make[1]: Entering directory `/home/zexu/devel/hello' gcc -DHAVE_CONFIG_H -I. -g -O2 -MT hello.o -MD -MP -MF .deps/hello.Tpo -c -o hello.o hello.c mv -f .deps/hello.Tpo .deps/hello.Po gcc -g -O2 -o hello.exe hello.o make[1]: Leaving directory `/home/zexu/devel/hello' zexu@DESKTOP-R4T030U ~/devel/hello $ ls Makefile aclocal.m4 config.h config.status depcomp hello.o stamp-h1 Makefile.am autom4te.cache config.h.in configure hello.c install-sh Makefile.in autoscan-2.68.log config.log configure.in hello.exe missing这个例子使用了libtool，我把代码提交到了github，先把其clone下来：
git clone https://github.com/harlanc/automake_examples.git进入example_2,先看一下目录结构：
$ ls -R .: Makefile.am configure.in error.c error.h lib main.c replace ./lib: Makefile.am source.c source.h ./replace: Makefile.am basename.c dummy.c执行下面的命令：
zexu@DESKTOP-R4T030U ~/automake_examples/example_2 $ aclocal zexu@DESKTOP-R4T030U ~/automake_examples/example_2 $ autoheader zexu@DESKTOP-R4T030U ~/automake_examples/example_2 $ automake --add-missing --copy configure.in:11: installing `./config.guess' configure.in:11: installing `./config.sub' configure.in:8: installing `./install-sh' configure.in:11: required file `./ltmain.sh' not found configure.in:8: installing `./missing' lib/Makefile.am: installing `./depcomp'看到有一个错误，执行下面的语句：
$libtoolize --automake --copy --debug --force在此执行automake:
$ automake --add-missing --copy最后成功，执行autoconf和configure：
zexu@DESKTOP-R4T030U ~/automake_examples/example_2 $ autoconf zexu@DESKTOP-R4T030U ~/automake_examples/example_2 $ ./configure最后生成Makefile文件，执行make，生成可执行文件：
$ make最后成功。
Convenience-Libraries
轻轻松松生成makefile
