linux安装skynet问题总结

skynet是为在线游戏服务器打造的轻量级框架，使用c+lua实现，支持linux 。使用这套框架能获得很大收益，其中一个就是，基本只需要用lua开发，很少用到c，提高了开发效率。但是，skynet本身对系统有很大依赖性，安装说明过于简单，没有提及到。所以文章这里总结linux安装skynet问题，希望有所帮助。

skynet的安装过程

git clone https://github.com/cloudwu/skynet.git
cd skynet

makelinux

简单3步，对于很多高版本的系统来说，可能就这3步。但是，低版本系统可能无法安装，如下：

1. gcc版本问题

2. 缺少 readline

3. 缺少 ncurses

4. 缺少 git （非必要项，则要手动下载skynet及3rd下的jemalloc）

5. 缺少 autoconf

所以，这里以CentOS5.5系统做说明，这系统不具备以上几个条件，甚至连git都无法通过包管理来安装。在skynet的编译过程中，如果在make步骤出现错误，要用 make cleanall 清除已编译的文件，不然会出现莫名其妙的错误。

在早期的skynet版本，lua不能清除干净，若是这样，执行：cd 3rd/lua && make clean && cd -

问题1：缺少git

#gitclone https://github.com/cloudwu/skynet.git
bash:git:commandnotfound

解决：

这里要安装git，在安装git过程中，非常重要一步是安装curl，而这一步会把git所有的依赖装上，如curl和openssl，而git编译时也要找到curl库

yum -y install curlcurl-devel

wget--no-check-certificate https://www.kernel.org/pub/software/scm/git/git-2.5.2.tar.gz

tar -zxfgit-2.5.2.tar.gz

cdgit-2.5.2

./configure --prefix=/usr

make

make install

问题2：git https错误

#gitclone https://github.com/cloudwu/skynet.git

Cloninginto'skynet'...
fatal:Unabletofindremotehelperfor'https'

解决：

很多网友都是说把https换成git解决，但也只是暂时性的。报错是git安装时系统缺少curl导致的，参考问题1重装git

重装git后，如果还不行，应该是git软连接问题，如下修正：

ln -sf /usr/bin/git /bin/git

问题3：缺少readline

lua.c:81:31: error: readline/readline.h: No such file or directory

lua.c:82:30: error: readline/history.h: No such file or directory

lua.c: In function ‘pushline’:

lua.c:311: warning: implicit declaration of function ‘readline’

lua.c:311: warning: assignment makes pointer from integer without a cast

lua.c: In function ‘addreturn’:

lua.c:342: warning: implicit declaration of function ‘add_history’

make[3]: *** [lua.o] Error 1

make[3]: Leaving directory `/data/git-2.5.2/skynet/3rd/lua'

make[2]: *** [linux] Error 2

make[2]: Leaving directory `/data/git-2.5.2/skynet/3rd/lua'

make[1]: *** [3rd/lua/liblua.a] Error 2

make[1]: Leaving directory `/data/git-2.5.2/skynet'

make: *** [linux] Error 2

解决：

yum -y install readline-devel

问题4：缺少ncurses

cc -std=gnu99 -o lua lua.o liblua.a -lm -Wl,-E -ldl -lreadline

/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../libreadline.so: undefined reference to `PC'

/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../libreadline.so: undefined reference to `tgetflag'

/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../libreadline.so: undefined reference to `tgetent'

/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../libreadline.so: undefined reference to `UP'

/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../libreadline.so: undefined reference to `tputs'

/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../libreadline.so: undefined reference to `tgoto'

/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../libreadline.so: undefined reference to `tgetnum'

/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../libreadline.so: undefined reference to `BC'

/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../libreadline.so: undefined reference to `tgetstr'

collect2: ld returned 1 exit status

make[3]: *** [lua] Error 1

make[3]: Leaving directory `/data/skynet/3rd/lua'

make[2]: *** [linux] Error 2

make[2]: Leaving directory `/data/skynet/3rd/lua'

make[1]: *** [3rd/lua/liblua.a] Error 2

make[1]: Leaving directory `/data/skynet'

make: *** [linux] Error 2

解决：
很多网友说修改Makefile，在SYSLIBS变量中追加" -lncurses "选项，但这样不方便，以后还会遇到这个问题。所以这里建议手动安装readline

yum -y install ncurses-devel

wget ftp://ftp.gnu.org/gnu/readline/readline-6.2.tar.gz

tar -zxf readline-6.2.tar.gz

cd readline-6.2

./configure --prefix=/usr

make SHLIB_LIBS=-lncurses

make install

ldconfig

备注：

1、国内连接gnu.org网站不是很稳定，可能wget要多试几次。

2、通过ldconfig-p|grepreadline可以测试readline的库是否成功加载

3、如果还无法解决，执行以下命令（建议先备份下）：

rm -rf /usr/lib/libreadline*

ldconfig

如果是64位机器：

rm -rf /usr/lib64/libreadline*

ldconfig

问题5：lua整数编译报错

3rd/lua/luaconf.h:560:2: error: #error "Compiler does not support 'long long'. Use option '-DLUA_32BITS' or '-DLUA_C89_NUMBERS' (see file 'luaconf.h' for details)"

In file included from skynet-src/malloc_hook.c:5:

3rd/lua/lua.h:93: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘lua_Integer’

3rd/lua/lua.h:96: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘lua_Unsigned’

3rd/lua/lua.h:182: warning: type defaults to ‘int’ in declaration of ‘lua_Integer’

3rd/lua/lua.h:182: error: ‘lua_Integer’ declared as function returning a function

3rd/lua/lua.h:182: warning: parameter names (without types) in function declaration

3rd/lua/lua.h:226: error: expected declaration specifiers or ‘...’ before ‘lua_Integer’

3rd/lua/lua.h:244: error: expected declaration specifiers or ‘...’ before ‘lua_Integer’

3rd/lua/lua.h:246: error: expected declaration specifiers or ‘...’ before ‘lua_Integer’

3rd/lua/lua.h:261: error: expected declaration specifiers or ‘...’ before ‘lua_Integer’

3rd/lua/lua.h:263: error: expected declaration specifiers or ‘...’ before ‘lua_Integer’

skynet-src/malloc_hook.c: In function ‘update_xmalloc_stat_alloc’:

skynet-src/malloc_hook.c:55: warning: value computed is not used

skynet-src/malloc_hook.c: In function ‘update_xmalloc_stat_free’:

skynet-src/malloc_hook.c:65: warning: value computed is not used

skynet-src/malloc_hook.c: In function ‘dump_mem_lua’:

skynet-src/malloc_hook.c:237: error: too many arguments to function ‘lua_pushinteger’

skynet-src/malloc_hook.c:238: error: expected ‘)’ before ‘data’

skynet-src/malloc_hook.c:238: error: too many arguments to function ‘lua_rawseti’

In file included from skynet-src/skynet_log.c:1:

skynet-src/skynet_log.h:14:7: warning: no newline at end of file

make[1]: *** [skynet] Error 1

make[1]: Leaving directory `/data/skynet'

make: *** [linux] Error 2

解决：

这个是skynet最常见的编译失败了，和gcc版本有关，升级gcc可以解决问题。

最简单的方法：修改Makefile，在CFLAGS 加入 -std=gnu99

如果不想手动改，可用以下命令：

sed -i "s|CFLAGS =|CFLAGS = -std=gnu99 |" Makefile

如果是升级gcc参考问题6的解决方式。

问题6：gcc编译器问题

/data/skynet/skynet-src/skynet_server.c:211: undefined reference to `__sync_sub_and_fetch_4'

/tmp/ccC4fGch.o: In function `cmd_logoff':

/data/skynet/skynet-src/skynet_server.c:589: undefined reference to `__sync_bool_compare_and_swap_4'

/tmp/ccC4fGch.o: In function `cmd_logon':

/data/skynet/skynet-src/skynet_server.c:568: undefined reference to `__sync_bool_compare_and_swap_4'

/tmp/ccaeanLP.o: In function `reserve_id':

/data/skynet/skynet-src/socket_server.c:241: undefined reference to `__sync_add_and_fetch_4'

/data/skynet/skynet-src/socket_server.c:247: undefined reference to `__sync_bool_compare_and_swap_2'

/data/skynet/skynet-src/socket_server.c:243: undefined reference to `__sync_and_and_fetch_4'

/tmp/ccs12kTV.o: In function `get_allocated_field':

/data/skynet/skynet-src/malloc_hook.c:36: undefined reference to `__sync_bool_compare_and_swap_4'

/data/skynet/skynet-src/malloc_hook.c:40: undefined reference to `__sync_bool_compare_and_swap_4'

collect2: ld returned 1 exit status

make[1]: *** [skynet] Error 1

make[1]: Leaving directory `/data/skynet'

make: *** [linux] Error 2

解决：

这是gcc版本问题，解决方法就是到高版本（如gcc4.5）下载一个linux_atomic.c文件，将其编译为一个静态库链接到你的项目代码，具体做法也比较麻烦。所以，这里推荐重装gcc。

另外，编译skynet建议gcc最低版本4.6.0，可自动下载并更新依赖包。安装gcc过程会比较久，要耐心等待

安装gcc步骤如下：（确保磁盘可用空间至少4G）

wget http://mirrors.ustc.edu.cn/gnu/gcc/gcc-4.6.0/gcc-4.6.0.tar.gz

tar -zxfgcc-4.6.0.tar.gz

cdgcc-4.6.0

./contrib/download_prerequisites
mkdir build

cd build

../configure --prefix=/usr -enable-checking=release -enable-languages=c,c++ -disable-multilib

make

make install

注意了，要确保 download_prerequisites 安装成功。因为国内连接gnu.org网站不是很稳定，可能出现类似错误：

Resolving gcc.gnu.org... 209.132.180.131

Connecting to gcc.gnu.org|209.132.180.131|:21... connected.

Logging in as anonymous ... Logged in!

==> SYST ... done. ==> PWD ... done.

==> TYPE I ... done. ==> CWD /pub/gcc/infrastructure ... done.

==> SIZE mpfr-2.4.2.tar.bz2 ... 1077886

==> PASV ... couldn't connect to 209.132.180.131 port 10179: Connection refused

如果重试了很多次都无法成功，尝试手动安装吧，主要就3个依赖gmp和mpfr、mpc，装好后再继续执行gcc ../configure及后面的步骤。

wget http://ftp.gnu.org/gnu/gmp/gmp-4.2.2.tar.bz2

tar -jxf gmp-4.2.2.tar.bz2

cd gmp-4.2.2

./configure --prefix=/usr

make && make install

wget http://mpfr.loria.fr/mpfr-2.3.2/mpfr-2.3.2.tar.gz

tar -zxf mpfr-2.3.2.tar.gz

cd mpfr-2.3.2

./configure --prefix=/usr

make && make install

wget ftp://gcc.gnu.org/pub/gcc/infrastructure/mpc-0.8.1.tar.gz

tar -zxfmpc-0.8.1.tar.gz

cdmpc-0.8.1
./configure --prefix=/usr

make && make install

问题7：缺少autoconf

make all PLAT=linux SKYNET_LIBS="-lpthread -lm -ldl -lrt" SHARED="-fPIC --shared" EXPORT="-Wl,-E" MALLOC_STATICLIB="3rd/jemalloc/lib/libjemalloc_pic.a" SKYNET_DEFINES=""

make[1]: Entering directory `/data/skynet'

cd 3rd/jemalloc && ./autogen.sh --with-jemalloc-prefix=je_ --disable-valgrind

autoconf

./autogen.sh: line 5: autoconf: command not found

Error 0 in autoconf

make[1]: *** [3rd/jemalloc/Makefile] Error 1

make[1]: Leaving directory `/data/skynet'

make: *** [linux] Error 2

解决：

yum -y install autoconf

问题8：链接错误

ln -sf libjemalloc.so.2 lib/libjemalloc.so

ln: creating symbolic link `lib/libjemalloc.so' to `libjemalloc.so.2': Operation not supported

make[3]: *** [lib/libjemalloc.so] Error 1

make[3]: Leaving directory `/mnt/hgfs/vm/skynet/3rd/jemalloc'

make[2]: *** [3rd/jemalloc/lib/libjemalloc_pic.a] Error 2

make[2]: Leaving directory `/mnt/hgfs/vm/skynet'

make[1]: *** [linux] Error 2

make[1]: Leaving directory `/mnt/hgfs/vm/skynet'

make: *** [default] Error 2

解决：

虚拟机共享目录不能设置软连接，选择其他目录安装

最后语

如果还遇到其他错误，可以评论一起讨论，正好我也一起整理下。另外，文章看似在总结linux安装skynet遇到的问题，实际上也讨论了lua5.3的安装问题，以及gcc安装问题，希望有所帮助。

2015/9/25 调整问题的排版顺序，方便阅读

参考：http://blog.csdn.net/mycwq/article/details/48690915