C++ 如何修复：'；制作共享对象时不能使用；使用-fPIC'重新编译；使用Cmake。使用普通g++；作品

我收到一条消息“创建共享对象时不能使用”；使用-fPIC'重新编译

我尝试过其他例子，问题也是一样的

我试过了

• 从模块更改为共享
• 克马克-DCMAKE_CXX_标志=-fPIC
• 和其他变体

这是有效的：

c++ -c -fPIC -I/usr/include/python3.6m ../account.cpp

c++ -shared -Wall -Werror -Wl,--export-dynamic account.o -L/usr/local/lib -lboost_python36 -o account.so

cmake_minimum_required(VERSION 3.10 FATAL_ERROR)
project(Test)
option(BUILD_SHARED_LIBS "Build libraries as shared as opposed to static" ON)
find_package(PythonInterp REQUIRED)
find_package(PythonLibs ${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR} EXACT REQUIRED)
find_package(Boost 1.70.0 COMPONENTS python REQUIRED)
add_library(account SHARED account.cpp)
target_link_libraries(account Boost::python)
target_include_directories(account PRIVATE ${PYTHON_INCLUDE_DIRS})
set_target_properties(account PROPERTIES PREFIX "")

这是基本的cmake

cmake_minimum_required(VERSION 3.10 FATAL_ERROR)

project(Test)

find_package(PythonInterp REQUIRED)

find_package(PythonLibs ${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR} EXACT REQUIRED)

find_package(Boost 1.70.0 COMPONENTS python REQUIRED)

add_library(account SHARED account.cpp)

target_link_libraries(account Boost::python)

target_include_directories(account PRIVATE ${PYTHON_INCLUDE_DIRS})

set_target_properties(account PROPERTIES PREFIX "")

使用：make VERBOSE=1，输出命令为：

c++  -DBOOST_ALL_NO_LIB -Daccount_EXPORTS -I/usr/include/python3.6m -isystem /usr/local/include  -fPIC   -o CMakeFiles/account.dir/account.cpp.o -c /src/boost_python_example/account.cpp

c++ -fPIC   -shared -Wl,-soname,account.so -o account.so CMakeFiles/account.dir/account.cpp.o /usr/local/lib/libboost_python36.a

---

所以cmake没有得到相同的路径和标志，我正在学习cmake，所以我试图理解这个问题。显然，问题不在于实际的LIB，而在于告诉cmake在哪里可以找到合适的LIB。

解决方案非常简单。比较两个命令cmake命令中缺少的内容是：--export dynamic

因此，我使用选项解决了这个问题（BUILD_SHARED_LIBS“BUILD libraries as SHARED而非static”ON）非常有趣，需要注释

工作解决方案：

c++ -c -fPIC -I/usr/include/python3.6m ../account.cpp

c++ -shared -Wall -Werror -Wl,--export-dynamic account.o -L/usr/local/lib -lboost_python36 -o account.so

cmake_minimum_required(VERSION 3.10 FATAL_ERROR)
project(Test)
option(BUILD_SHARED_LIBS "Build libraries as shared as opposed to static" ON)
find_package(PythonInterp REQUIRED)
find_package(PythonLibs ${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR} EXACT REQUIRED)
find_package(Boost 1.70.0 COMPONENTS python REQUIRED)
add_library(account SHARED account.cpp)
target_link_libraries(account Boost::python)
target_include_directories(account PRIVATE ${PYTHON_INCLUDE_DIRS})
set_target_properties(account PROPERTIES PREFIX "")

---

感谢大家的评论，他们为我提供了一个全新的解决方案

，请尝试进行详细构建（

make verbose=1

）以查看实际使用了哪些命令（以及选项/标志）来构建库。CMake正在做它应该做的事情吗？请在问题帖子中添加准确的错误消息，并使用准确的文件名。在目前的形式中，错误描述非常模糊。