在编译最新版本(12.04)的alljoyn的chat示例的时候,想使用bundle daemon,依照在以前的经验修改文件:alljoyn-14.02.00-src/build/linux/x86_64/debug/dist/samples/chat/makefile:
LIBS = -lalljoyn ../../lib/BundledRouter.o -lajrouter -lstdc++ -lcrypto -lpthread -lrt
1). 编译ok,但运行时报错:
./chat
./chat: error while loading shared libraries: liballjoyn.so: cannot open shared object file: No such file or directory
原来../../lib/目录下有两个库:
ll ../../lib/
total 71552
drwxr-xr-x 2 z.rao CAF 4096 Apr 9 19:56 ./
drwxr-xr-x 6 z.rao CAF 4096 Apr 9 18:35 ../
-rw-r--r-- 1 z.rao CAF 529336 Apr 9 18:36 BundledRouter.o
-rw-r--r-- 1 z.rao CAF 38765950 Apr 9 18:36 libajrouter.a
-rw-r--r-- 1 z.rao CAF 24335844 Apr 9 18:35 liballjoyn.a
-rwxr-xr-x 1 z.rao CAF 9621229 Apr 9 19:56 liballjoyn.so*
默认连接的是动态库:liballjoyn.so*
虽然可以通过ldconfig搞定动态库的连接问题,但考虑到程序的发布问题,我决定连接静态库liballjoyn.a
2).于是,删除liballjoyn.so,这样程序就会连接到静态库liballjoyn.a了:
rm ../../lib/liballjoyn.so
make clean;make
很不幸报错:
g++ -c -Wall -pipe -std=c++98 -fno-rtti -fno-exceptions -Wno-long-long -Wno-deprecated -g -DQCC_OS_LINUX -DQCC_OS_GROUP_POSIX -DQCC_CPU_X86 -I../../inc -o chat.o chat.cc
g++ -o chat chat.o -L../../lib -lalljoyn ../../lib/BundledRouter.o -lajrouter -lstdc++ -lcrypto -lpthread -lrt
../../lib/BundledRouter.o: In function `BundledRouter::Start(ajn::NullTransport*)':
/home/z.rao/work/Library/alljoyn-14.02.00-src/alljoyn_core/router/bundled/BundledRouter.cc:263: undefined reference to `qcc::LoggerSetting::GetLoggerSetting(char const*, int, bool, _IO_FILE*)'
../../lib/BundledRouter.o: In function `ajn::PasswordManager::GetPassword()':
/home/z.rao/work/Library/alljoyn-14.02.00-src/alljoyn_core/inc/alljoyn/PasswordManager.h:65: undefined reference to `ajn::PasswordManager::password'
../../lib/BundledRouter.o: In function `ajn::PasswordManager::GetAuthMechanism()':
/home/z.rao/work/Library/alljoyn-14.02.00-src/alljoyn_core/inc/alljoyn/PasswordManager.h:71: undefined reference to `ajn::PasswordManager::authMechanism'
../../lib/libajrouter.a(TCPTransport.o): In function `ajn::TCPTransport::GetListenAddresses(ajn::SessionOpts const&, std::vector<qcc::String, std::allocator<qcc::String> >&) const':
/home/z.rao/work/Library/alljoyn-14.02.00-src/alljoyn_core/router/TCPTransport.cc:1193: undefined reference to `qcc::IfConfig(std::vector<qcc::IfConfigEntry, std::allocator<qcc::IfConfigEntry> >&)'
../../lib/libajrouter.a(TCPTransport.o): In function `ajn::TCPTransport::Connect(char const*, ajn::SessionOpts const&, qcc::ManagedObj<ajn::_BusEndpoint>&)':
没有定义?
看看导出了哪些符号?
nm -C ../../lib/liballjoyn.a |grep GetLoggerSetting
0000000000000476 T qcc::LoggerSetting::GetLoggerSetting(char const*, int, bool, _IO_FILE*)
0000000000000000 W qcc::LoggerSetting::GetLoggerSetting()
明明已经定义了啊.....哭。。。
之前连接动态库liballjoyn.so就可以,静态库liballjoyn.a为什么不行呢?。。。。百思不得其解
3).想来想去,可能是静态库的连接顺序导致了循环依赖,除此以外似乎没有其他可能了。
于是网上猛搜一通,发现
http://www.cnblogs.com/wujianlundao/archive/2012/06/06/2538125.html
将makefile修改为如下形式:
LIBS = -Xlinker "-(" -lalljoyn ../../lib/BundledRouter.o -lajrouter -Xlinker "-)" -lstdc++ -lcrypto -lpthread -lrt
果然搞定了!
要问-Xlinker干啥的?。。。。哈哈啊