CMake对类的未定义引用

Question

我正在尝试使用CMake编译项目，但是却获得了对我创建的类函数的未定义引用。 如果我手动创建一个Makefile，则一切编译正常。 但是，当我使用CMake时，出现了undefined reference错误。

这是目录结构：

. ├── build ├── CMakeLists.txt ├── info │ ├── indexer.pdf │ └── search.pdf ├── Makefile ├── sample │ ├── 1 │ │ └── b.txt │ ├── 2 │ │ └── c.txt │ ├── 3 │ │ └── d.txt │ └── a.txt ├── src │ ├── cpp │ │ ├── index.cpp │ │ └── record.cpp │ ├── h │ │ ├── index.h │ │ └── record.h │ └── main.cpp ├── tests │ └── a └── todo.txt

CMakeLists.txt ：

cmake_minimum_required(VERSION 2.8)

# Project Name
PROJECT(indexer CXX)

# Binary dir
# Built in CMake variables:
    # CMAKE_SOURCE_DIR: the directory where cmake was executed
    # CMAKE_BINARY_DIR: where the output will go 
    # EXECUTABLE_OUTPUT_PATH: common place to put executables if         you don't want it to be CMAKE_BINARY_DIR
    # LIBRARY_OUTPUT_PATH: common place to put libraries if you don't want it to be CMAKE_BINARY_DIR

set(CMAKE_BINARY_DIR ${CMAKE_SOURCE_DIR}/build)
set(EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR})
set(LIBRARY_OUTPUT_PATH ${CMAKE_BINARY_DIR})

# Add additional compiler flags
# Built-ins:
#   - CMAKE_CXX_FLAGS_DEBUG = -g
#   - CMAKE_CXX_FLAGS_RELEASE = -O3 -NDEBUG
set(CMAKE_CXX_FLAGS "-std=c++0x -Wall")


include_directories("${PROJECT_SOURCE_DIR}/src/h")

# Aggregate the sources
file(GLOB SOURCES "${PROJECT_SOURCE_DIR}/src/cpp")

add_executable(indexer "${PROJECT_SOURCE_DIR}/src/main.cpp" ${SOURCES})``

错误：

CMakeFiles/indexer.dir/src/main.cpp.o: In function `parse(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, Index*)':
main.cpp:(.text+0x1b5): undefined reference to `Record::Record(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, int)'
main.cpp:(.text+0x1ee): undefined reference to `Index::add(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, Record)'
CMakeFiles/indexer.dir/src/main.cpp.o: In function `main':
main.cpp:(.text+0x77d): undefined reference to `Index::Index()'
main.cpp:(.text+0x84b): undefined reference to `Index::print()'
collect2: error: ld returned 1 exit status
CMakeFiles/indexer.dir/build.make:94: recipe for target 'indexer' failed
make[2]: *** [indexer] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/indexer.dir/all' failed
make[1]: *** [CMakeFiles/indexer.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

有人可以告诉我我在做什么错吗？

Answer 1

你的问题是线

file(GLOB SOURCES "${PROJECT_SOURCE_DIR}/src/cpp")

这会将SOURCES变量设置为src目录中名为cpp的文件。 我想你的意思是

file(GLOB SOURCES "${PROJECT_SOURCE_DIR}/src/cpp/*.cpp")

这将捕获所有以.cpp扩展名结尾的文件，并将它们放入SOURCES变量中。

注意：我认为您不需要将"${PROJECT_SOURCE_DIR}/src/main.cpp"作为参数传递给create_executable ，因为您的SOURCES变量应该已经包含main.cpp 。