使用gcc4.7在linux x64平台上使用autot和asio测试构建失败

Question

我尝试构建boost asio示例提供的示例代码:http: //www.boost.org/doc/libs/1_54_0/doc/html/boost_asio/example/cpp11/spawn/echo_server.cpp

我复制所有代码并将其放入cpp文件,使用gcc4.7和cmake在linux上编译,与boost coroutine和boost上下文库链接,但链接失败.

输出如下:

Linking CXX executable ../../../output/bin/unit_test
cd /home/watson/ID_project/build/server_linux_makefile_gcc/abc/test/unit/abc_async && /usr/local/bin/cmake -E cmake_link_script CMakeFiles/unit_test.dir/link.txt --verbose=1
/usr/bin/c++   -std=c++11 -O3 -DNDEBUG  -pthread -lrt -ltcmalloc -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free CMakeFiles/unit_test.dir/TestFileChannel.cpp.o CMakeFiles/unit_test.dir/TestStreamBuffer.cpp.o CMakeFiles/unit_test.dir/TestTimer.cpp.o CMakeFiles/unit_test.dir/TestThreadPool.cpp.o CMakeFiles/unit_test.dir/TestScheduler.cpp.o CMakeFiles/unit_test.dir/PCH.cpp.o CMakeFiles/unit_test.dir/main.cpp.o CMakeFiles/unit_test.dir/TestUDPNetwork.cpp.o CMakeFiles/unit_test.dir/TestTCPNetwork.cpp.o  -o ../../../output/bin/unit_test -rdynamic ../../../../../../install/thirdparty_linux_makefile_gcc/lib/libboost_unit_test_framework-gcc47-mt-1_54.a ../../../../../../install/thirdparty_linux_makefile_gcc/lib/libboost_context-gcc47-mt-1_54.a ../../../../../../install/thirdparty_linux_makefile_gcc/lib/libboost_coroutine-gcc47-mt-1_54.a ../../../../../../install/thirdparty_linux_makefile_gcc/lib/libboost_thread-gcc47-mt-1_54.a ../../../../../../install/thirdparty_linux_makefile_gcc/lib/libboost_filesystem-gcc47-mt-1_54.a ../../../../../../install/thirdparty_linux_makefile_gcc/lib/libyaml-cpp.a ../../../../../../install/thirdparty_linux_makefile_gcc/lib/libmongoc.a ../../../../../../install/thirdparty_linux_makefile_gcc/lib/libboost_system-gcc47-mt-1_54.a ../../../../../../install/thirdparty_linux_makefile_gcc/lib/libprotobuf.a
../../../../../../install/thirdparty_linux_makefile_gcc/lib/libboost_coroutine-gcc47-mt-1_54.a(coroutine_context.o): In function `boost::coroutines::detail::coroutine_context::coroutine_context(void (*)(long), boost::coroutines::stack_context*)':
coroutine_context.cpp:(.text+0x103): undefined reference to `make_fcontext'
../../../../../../install/thirdparty_linux_makefile_gcc/lib/libboost_coroutine-gcc47-mt-1_54.a(coroutine_context.o): In function `boost::coroutines::detail::coroutine_context::jump(boost::coroutines::detail::coroutine_context&, long, bool)':
coroutine_context.cpp:(.text+0x1bc): undefined reference to `jump_fcontext'
collect2: error: ld returned 1 exit status
make[2]: *** [abc/output/bin/unit_test] Error 1

我从.a文件中打印符号表,并找到符号jump_fcontext' andmake_fcontext'已存在:

nm libboost_context-gcc47-mt-1_54.a

make_x86_64_sysv_elf_gas.o:
                 U _GLOBAL_OFFSET_TABLE_
                 U _exit
000000000000002e t finish
0000000000000000 T make_fcontext

jump_x86_64_sysv_elf_gas.o:
0000000000000000 T jump_fcontext

有人可以给我任何提示吗？我尝试google每个地方,但没有信息.

Answer 1

尝试交换的链接顺序boost_context和boost_coroutine.

该连接器的文档状态:

[...]链接器按照指定的顺序搜索和处理库和目标文件.因此,'foo.o -lz bar.o'在文件foo.o之后但在bar.o之前搜索库'z'.如果bar.o引用'z'中的函数,则可能无法加载这些函数.

在这种情况下, Boost.Coroutine依赖于Boost.Context.因此,boost_coroutine应该boost_context在链接之前出现.有关更多链接器排序详细信息,请考虑阅读此答案