问题一:问题描述:
在centos7上编译mosquitto源码时,出现以下问题:
make[1]: 进入目录“/home/jason/mosquitto-1.2/man”
xsltproc mosquitto.8.xml
warning: failed to load external entity "/usr/share/xml/docbook/stylesheet/docbook-xsl/manpages/docbook.xsl"
compilation error: file manpage.xsl line 3 element import
xsl:import : unable to load /usr/share/xml/docbook/stylesheet/docbook-xsl/manpages/docbook.xsl
compilation error: file mosquitto.8.xml line 4 element refentry
xsltParseStylesheetProcess : document is not a stylesheet
make[1]: *** [mosquitto.8] 错误 5
make[1]: 离开目录“/home/jason/mosquitto-1.2/man”
make: *** [docs] 错误 2
由提示可以看到,此时问题的原因在于在文件:manpage.xsl里面加载不了:docbook.xsl所致,错误提示中也显示在绝对路径:
/usr/share/xml/docbook/stylesheet/docbook-xsl/manpages/docbook.xsl
下找不到这个文件:
docbook.xsl
再看文件manpage.xsl里,按照所提示第3行,果然是这个绝对地址:
通过命令查找文件 docbook.xsl,在本机中也没有发现,因此基本可以确定是找不到这个文件所致:
[root@localhost mosquitto-1.2]# find / -name docbook.xsl
解决办法:
1.安装docbook-style-xsl
使用命令:yum -y install docbook-style-xsl
2.查看文件docbook.xsl被安装到了哪里:
例如:
[root@localhost tools]# find / -name docbook.xsl
/usr/share/sgml/docbook/xsl-stylesheets-1.78.1/epub/docbook.xsl
/usr/share/sgml/docbook/xsl-stylesheets-1.78.1/fo/docbook.xsl
/usr/share/sgml/docbook/xsl-stylesheets-1.78.1/html/docbook.xsl
/usr/share/sgml/docbook/xsl-stylesheets-1.78.1/manpages/docbook.xsl
/usr/share/sgml/docbook/xsl-stylesheets-1.78.1/xhtml/docbook.xsl
/usr/share/sgml/docbook/xsl-stylesheets-1.78.1/xhtml-1_1/docbook.xsl
3.搜索到之后,将上面红字中的地址修改到文件manpage.xsl里的对应位置;
4.再重新编译mosquitto,问题已经解决!
问题二:执行mosquitto客户端程序时出现找不到动态库:libmosquitto.so.1
./mosquitto_sub: error while loading shared libraries: libmosquitto.so.1: cannot open shared object file: No such file or directory
执行命令:
sudo ln -s /usr/local/lib/libmosquitto.so.1 /usr/lib/libmosquitto.so.1
和
ldconfig
即可
问题三: Invalid user 'mosquitto'.
[root@localhost src]# ./mosquitto
1437558553: Error: Invalid user 'mosquitto'.
两种解决办法:
(1)修改配置文件:mosquitto.conf ,增加登录的用户,例如当前登录用户为root
(1)执行命令增加当前用户:
adduser mosquitto
如下图:
问题四:
在修改mosquitto源码之后,换到centos环境下重新编译时可能会出现下面的问题:
mosquitto.c:271:2: 错误:缺少结尾的 " 字符
snprintf(buf, 1024, "%s", CHANGESET);
^
mosquitto.c:271:37: 错误:expected expression before ‘)’ token
snprintf(buf, 1024, "%s", CHANGESET);
^
该问题的原因是文件:changeset的格式不对,可在centos环境下,按照如下方式修改此文件的格式:
使用vi打开此文件,然后使用:
:set ff=unix
重新设置一下此文件的格式,然后保存退出即可
问题五:xsltproc: Command not found
mosquitto编译的时候出现问题:xsltproc: Command not found
如下图所示:
解决办法:安装libxslt
yum -y install libxslt
问题六:
./mosquitto_internal.h:40:20: error: ares.h: No such file or directory
解决办法:
WITH_SRV=no
cd
wget http://c-ares.haxx.se/download/c-ares-1.10.0.tar.gztar xvf c-ares-1.10.0.tar.gz
cd c-ares-1.10.0
./configure
make
sudo make install