Question

我在尝试将我最近推送到Git的库链接到我的CMake项目时遇到了麻烦。

我已将库命名为octal（GitHub），并尝试将其链接到我的其他库bulletframe（GitHub）。这两个项目都是由我创建的。

我预计链接库不会第一次工作，所以我只开始使用octal中的几个源文件。 octal的文件夹结构如下：

.gitignore
CMakeLists.txt
.git/
build/ # generated project files go here, but right now it's empty
src/
    CMakeLists.txt
    octal.h # this is empty
    octal/
        vector/
            vector.h
            vector.cpp

八进制/的CMakeLists.txt

#...

set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_HOME_DIRECTORY}")

add_subdirectory("src")

八进制/ SRC /的CMakeLists.txt

macro(add_include)
    set(ALL_INCLUDES ${ALL_INCLUDES} ${ARGV})
endmacro(add_include)

add_include("octal.h")
add_include("octal/vector/vector.cpp" "octal/vector/vector.h")

add_library(${PROJECT_NAME} STATIC ${ALL_INCLUDES})

install(TARGETS ${PROJECT_NAME} DESTINATION ${CMAKE_ARCHIVE_OUTPUT_DIRECTORY})

八进制/ SRC /载体/ vector.h

#pragma once

namespace octal
{
    class Vector
    {
        // ...
        Vector Add(Vector other);
        Vector Subtract(Vector other);
        Vector Multiply(Vector other);
        Vector Multiply(double x);
        Vector Divide(Vector other);
        Vector Divide(double x);
        // ...
    }
}

这些配置在构建liboctal.a文件方面取得了成功，但我不确定它们是否与bulletframe正确关联。有多个文件使用octal中的类，但这是它在尝试编译第一个源文件entity.cpp后给出的第一个错误：

fatal error: octal/vector/vector.h: No such file or directory
 #include "octal/vector/vector.h"
                                 ^
compilation terminated.
src\CMakeFiles\bulletframe.dir\build.make:57: recipe for target 'src/CMakeFiles/bulletframe.dir/entity.cpp.obj' failed
mingw32-make.exe[3]: *** [src/CMakeFiles/bulletframe.dir/entity.cpp.obj] Error 1
CMakeFiles\Makefile2:121: recipe for target 'src/CMakeFiles/bulletframe.dir/all' failed
mingw32-make.exe[2]: *** [src/CMakeFiles/bulletframe.dir/all] Error 2
CMakeFiles\Makefile2:133: recipe for target 'src/CMakeFiles/bulletframe.dir/rule' failed
mingw32-make.exe[1]: *** [src/CMakeFiles/bulletframe.dir/rule] Error 2
Makefile:130: recipe for target 'bulletframe' failed
mingw32-make.exe: *** [bulletframe] Error 2

bulletframe具有与octal

类似的文件夹结构

bulletframe /的CMakeLists.txt ：

include(ExternalProject)
set(EXPROJ_DIR    "${CMAKE_HOME_DIRECTORY}/external")
set(LIB_DIR       "${CMAKE_HOME_DIRECTORY}/lib")

set(OCTAL_NAME          "octal-git")
set(OCTAL_GIT           "https://github.com/TheOctopod/octal-cpp.git")
set(OCTAL_PREFIX        "${EXPROJ_DIR}/${OCTAL_NAME}")
set(OCTAL_SOURCE_DIR    "${EXPROJ_DIR}/${OCTAL_NAME}")
set(OCTAL_BUILD_DIR     "${EXPROJ_DIR}/${OCTAL_NAME}/build")
set(OCTAL_INSTALL_DIR   "${LIB_DIR}")

ExternalProject_Add(${OCTAL_NAME}
    PREFIX          ${OCTAL_PREFIX}
    TMP_DIR         ${OCTAL_PREFIX}-tmp
    STAMP_DIR       ${OCTAL_PREFIX}-stamp
    # - Download Step ------------------
    GIT_REPOSITORY  ${OCTAL_GIT}
    # - Update Step --------------------
    UPDATE_COMMAND  ""
    # - Configure Step -----------------
    SOURCE_DIR      ${OCTAL_SOURCE_DIR}
    # - Build Step ---------------------
    BINARY_DIR      ${OCTAL_BUILD_DIR}
    # - Install Step ------------------
    INSTALL_COMMAND ""
    CMAKE_ARGS
    "-DCMAKE_BUILD_TYPE=Release"
)

add_library("octal" STATIC IMPORTED)
set_target_properties("octal" PROPERTIES
    # this is where ExternalProject built liboctal.a at
    IMPORTED_LOCATION "${OCTAL_BUILD_DIR}/src"
)

add_subdirectory(src)

bulletframe / SRC /的CMakeLists.txt

macro(add_include)
    set(ALL_INCLUDES ${ALL_INCLUDES} ${ARGV})
endmacro(add_include)

add_include("entity.cpp")

add_library(${PROJECT_NAME} STATIC ${ALL_INCLUDES})

target_link_libraries(${PROJECT_NAME} "octal")

目前，我的当前配置无法与bulletframe和Visual Studio 10 2013生成器构建MinGW Makefiles。

当我目睹编译器每次都出现类似错误时，脑海中浮现出几个问题：

我没有正确构建静态库（octal）吗？
我是否未将其正确链接到我的项目（bulletframe）？

Answer 1

看起来你正在构建八进制确定，但是没有为其源提供正确的路径（对于子弹框能够#include它），也没有为其编译的库提供。

修复包含问题很简单;只需添加导入库的INTERFACE_INCLUDE_DIRECTORIES属性的路径即可。但是，修复库的路径有点棘手。

使用MSVC，八进制库的完整路径将是

${OCTAL_SOURCE_DIR}/lib/<build type>/octal.lib

其中<build type>是“Debug”，“Release”等。但是，对于其他编译器，路径将是

${OCTAL_SOURCE_DIR}/lib/liboctal.a

为了解决这个问题，我会做类似的事情：

add_library(octal STATIC IMPORTED)
if(MSVC)
  set_target_properties(octal PROPERTIES
      IMPORTED_LOCATION_DEBUG "${OCTAL_SOURCE_DIR}/lib/Debug/octal.lib"
      IMPORTED_LOCATION_RELEASE "${OCTAL_SOURCE_DIR}/lib/Release/octal.lib"
      INTERFACE_INCLUDE_DIRECTORIES "${OCTAL_SOURCE_DIR}/src")
else()
  set_target_properties(octal PROPERTIES
      IMPORTED_LOCATION "${OCTAL_SOURCE_DIR}/lib/liboctal.a"
      INTERFACE_INCLUDE_DIRECTORIES "${OCTAL_SOURCE_DIR}/src")
endif()

无法将外部git CMake项目的输出（静态库）链接到CMake项目

1 个答案: