Question

我正在尝试创建一个指定了-fPIC的静态库。

add_library(cpp-netlib_pic
    STATIC
    ${SRCS})
set_property(TARGET cpp-netlib_pic PROPERTY POSITION_INDEPENDENT_CODE)

这不起作用。

库（cpp-netlib_pic）的构建没有-fPIC标志。

与cpp-netlib_pic相关联的其他目标执行但是，-fPIC已添加到其编译器标志中，但链接失败，因为cpp-netlib_pic没有。

此处foo将添加-fPIC：

add_library(foo
    SHARED
    ${SRCS})
target_link_libraries(foo cpp-netlib_pic)

我用make VERBOSE = 1

证明了这一点

[ 87%] Building CXX object third_party/cpp-netlib/CMakeFiles/cpp-netlib_pic.dir/src/server_request_parsers_impl.cpp.o
/usr/bin/c++   ... -std=c++14 -Werror -Wall -Wextra ... \
    -o CMakeFiles/cpp-netlib_pic.dir/src/server_request_parsers_impl.cpp.o \
    -c .../third_party/cpp-netlib/src/server_request_parsers_impl.cpp

请注意此处没有-fPIC。

在构建使用foo的目标cpp-netlib_pic时，会出现-fPIC：

[ 93%] Building CXX object foo.cc.o
/usr/bin/c++  ... -std=c++14 -Werror -Wall -Wextra ... -fPIC ... \
    -o CMakeFiles/foo_shared_lib.dir/foo.cc.o \
    -c .../foo/foo.cc

如何配置CMake以使用cpp-netlib_pic构建第一个库（-fPIC）？

Answer 1

您似乎忘记了private Adapter adapter; private ListView listView; private DatabaseReference reference; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity); listView = (ListView) findViewById(R.id.list); adapter = new Adapter(this, R.id.list); listView.setAdapter(adapter); FirebaseDatabase database = FirebaseDatabase.getInstance(); reference = database.getReference("database"); reference.addChildEventListener(new com.google.firebase.database.ChildEventListener() { @Override public void onChildAdded(com.google.firebase.database.DataSnapshot dataSnapshot, String s) { Project msg = dataSnapshot.getValue(Project.class); adapter.add(msg); adapter.notifyDataSetChanged(); } @Override public void onChildChanged(com.google.firebase.database.DataSnapshot dataSnapshot, String s) { } @Override public void onChildRemoved(com.google.firebase.database.DataSnapshot dataSnapshot) { } @Override public void onChildMoved(com.google.firebase.database.DataSnapshot dataSnapshot, String s) { } @Override public void onCancelled(DatabaseError databaseError) { } }); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Project selectedList = adapter.getItem(position); if (selectedList != null) { Intent intent = new Intent(Activity.this, Details_Project_Activity.class); intent.putExtra(Constants.KEY_LIST_TITLE, selectedList.getTitle()); intent.putExtra(Constants.KEY_LIST_PLACE, selectedList.getPlace()); intent.putExtra(Constants.KEY_LIST_DATE, selectedList.getDate()); startActivity(intent); } } }); }：

ON

如何配置CMake使用-fPIC构建库？

1 个答案: