Question

我有以下CMakeLists：

cmake_minimum_required(VERSION 3.3)
project(untitled)

set(SOURCE_FILES main.cpp)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -I/home/kernael/.openmpi/include -pthread -Wl,-rpath -Wl,/home/kernael/.openmpi/lib -Wl,--enable-new-dtags -L/home/kernael/.openmpi/lib -lmpi_cxx -lmpi")

add_executable(untitled ${SOURCE_FILES})

但是构建似乎失败了，因为CMake在“-l”选项之后自动指定源（main.cpp），这似乎是问题，因为使用命令行，以下命令有效：

g++ -I/home/kernael/.openmpi/include -pthread -L/home/kernael/.openmpi/lib main.cpp -lmpi_cxx -lmpi

但是这个没有并产生与CMake构建相同的错误：

g++ -I/home/kernael/.openmpi/include -pthread -L/home/kernael/.openmpi/lib -lmpi_cxx -lmpi main.cpp

如何告诉CMake在链接发生之前指定源文件？

Answer 1

您想要调查以下CMake命令：

https://cmake.org/cmake/help/v3.3/command/target_include_directories.html https://cmake.org/cmake/help/v3.3/command/target_link_libraries.html

这样的事情应该完成工作：

cmake_minimum_required(VERSION 3.3)
add_executable(untitled main.cxx)
target_include_directories(untitled PUBLIC /home/kernael/.openmpi/include)
target_link_libraries(untitled -pthread -L/home/kernael/.openmpi/lib -lmpi_cxx -lmpi)

Answer 2

您不能将CMAKE_CXX_FLAGS用于CMake中的包含，它仅适用于编译器选项。

您必须找到find_package的MPI。然后CMake找到包含路径和库。

find_package(MPI)
if (MPI_C_FOUND)
  include_directories(${MPI_INCLUDE_PATH})
  add_executable(untitled ${SOURCE_FILES})
  target_link_libraries(untitled ${MPI_LIBRARIES})
  set_target_properties(untitled PROPERTIES
                        COMPILE_FLAGS "${MPI_COMPILE_FLAGS}")
else()
  # MPI not found ...
endif()

CMake在链接之前指定源

2 个答案: