ffmpeg升级4.3.1版本，套用2.4.2版本静态库编译环境，编译不过问题

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我是靠谱客的博主俭朴夕阳，这篇文章主要介绍ffmpeg升级4.3.1版本，套用2.4.2版本静态库编译环境，编译不过问题，现在分享给大家，希望可以做个参考。

之前的静态库编译脚本，直接将需要编译的文件全部放入编译列表编译即可，最新的ffmpeg下载下来以后，为了省事，直接套用老的方式，各种编不过，本人编译ffmpeg静态库只用到了libavutil libavformat libavcodec，其它几个未涉及~
下面说一下遇到的问题及解决方式：

1.许多地方提示函数在声明之前被调用的问题，统一加宏处理，config.h文件加入如下宏：
#define HAVE_COPYSIGN 1
#define HAVE_ERF 1
#define HAVE_ISFINITE 1
#define HAVE_HYPOT 1
#define HAVE_AVX512 0
#define CONFIG_OSSFUZZ 1

2.编译提示缺少各种*_list.c文件，编译出错，例如打印：

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bsf.c: In function 'av_bsf_list_parse_str':
bsf.c:541:5: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
while (bsf_str = av_strtok(buf, ",", &saveptr)) {
^
bitstream_filters.c: In function 'av_bsf_iterate':
bitstream_filters.c:69:34: error: 'bitstream_filters' undeclared (first use in this function)
const AVBitStreamFilter *f = bitstream_filters[i];
^
bitstream_filters.c:69:34: note: each undeclared identifier is reported only once for each function it appears in
make[2]: *** [bitstream_filters.o] 错误 1

这个查了好久的相关资料，没有运行configure脚本，导致没有生成这些list.c文件，相关说明去这里，传送阵：https://my.oschina.net/u/2326611/blog/798200

3.有些比较老的编译器，不支持if条件判断中定义变量，如下：
if(int i = 0; …)，编译直接报错，这个没啥好说的，手动一个一个的改吧，把定义放到“int i = 0”放到外面就好了；

4.说一下*_list.c文件生成方式，linux下进入ffmpeg目录下，看一下有没有configure文件，有的话再进行命令操作；

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[@localhost ffmpeg]$ ls
Changelog
CONTRIBUTING.md
COPYING.LGPLv2.1
doc
INSTALL.md
libavfilter
libavutil
libswscale
Makefile
RELEASE
VERSION
compat
COPYING.GPLv2
COPYING.LGPLv3
ffbuild
libavcodec
libavformat
libpostproc
LICENSE.md
presets
tests
configure
COPYING.GPLv3
CREDITS
fftools
libavdevice
libavresample
libswresample
MAINTAINERS
README.md
tools
[@localhost ffmpeg]$ ./configure
tput: unknown terminal "xterm"
tput: unknown terminal "xterm"
nasm/yasm not found or too old. Use --disable-x86asm for a crippled build.
If you think configure made a mistake, make sure you are using the latest
version from Git.
If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "ffbuild/config.log" produced by configure as this will help
solve the problem.
[@localhost ffmpeg]$ ./configure --disable-x86asm
tput: unknown terminal "xterm"
tput: unknown terminal "xterm"
install prefix
/usr/local
source path
.
C compiler
gcc
C library
glibc
ARCH
x86 (generic)
big-endian
no
runtime cpu detection
yes
standalone assembly
no
x86 assembler
nasm
MMX enabled
yes
MMXEXT enabled
yes

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[@localhost ffmpeg]$ ls
Changelog
CONTRIBUTING.md
COPYING.LGPLv2.1
doc
INSTALL.md
libavfilter
libavutil
libswscale
Makefile
RELEASE
VERSION
compat
COPYING.GPLv2
COPYING.LGPLv3
ffbuild
libavcodec
libavformat
libpostproc
LICENSE.md
presets
tests
configure
COPYING.GPLv3
CREDITS
fftools
libavdevice
libavresample
libswresample
MAINTAINERS
README.md
tools
[@localhost ffmpeg]$ ./configure
tput: unknown terminal "xterm"
tput: unknown terminal "xterm"
nasm/yasm not found or too old. Use --disable-x86asm for a crippled build.
If you think configure made a mistake, make sure you are using the latest
version from Git.
If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "ffbuild/config.log" produced by configure as this will help
solve the problem.
[@localhost ffmpeg]$ ./configure --disable-x86asm
tput: unknown terminal "xterm"
tput: unknown terminal "xterm"
install prefix
/usr/local
source path
.
C compiler
gcc
C library
glibc
ARCH
x86 (generic)
big-endian
no
runtime cpu detection
yes
standalone assembly
no
x86 assembler
nasm
MMX enabled
yes
MMXEXT enabled
yes