c++ - 怎么才能看到这个header？

Question

我一直在努力了解 CMake，最近我偶然发现了 CLion ide。到目前为止，它有点帮助。 在尝试将 google test 与 CLion 集成时，我克隆了 this github repo.

但是，我不明白保存测试方法的 .cpp 文件如何在错误的相对路径中“看到”库的头文件!

Calendar_check.cpp:

//
// Created by AK on 13/10/15.
//

#include "gtest/gtest.h"

#include "GregorianCalendar.h"
#include "JulianCalendar.h"
///Code that runs tests, not important for this question

然而，目录结构是这样设置的:

看项目是怎么设置的，calendar_check.cpp文件的#include语句是不是应该这样读

#include "../../calendars/GregorianCalendar.h" #include "../../calendars/JulianCalendar.h" 而不是？

我知道静态库没有头文件，所以我不明白 calendar_test.cpp 文件如何知道这些头文件在哪里使用它们使用的路径。

这是 CMakeLists.txt 文件:

根:

cmake_minimum_required(VERSION 3.1)
project(Calendar)

#add_definitions(-std=c++11 --target=x86_64-linux-gnu)
#set(CMAKE_CXX_STANDARD 11)

set(SOURCE_FILES main.cpp)
add_executable(calendar_run ${SOURCE_FILES})

include_directories(calendars)

add_subdirectory(calendars)
add_subdirectory(calendars_tests)


target_link_libraries(calendar_run calendars)

根/日历:

project(calendars)

set(HEADER_FILES
        calendar_defs.h
        General.h
        GregorianCalendar.h
        JulianCalendar.h
        IslamicCalendar.h
        HebrewCalendar.h
    )

set(SOURCE_FILES
        calendar_defs.cpp
        Calendar.cpp
        General.cpp
        GregorianCalendar.cpp
        JulianCalendar.cpp
        IslamicCalendar.cpp
        HebrewCalendar.cpp
    )

add_library(calendars STATIC ${SOURCE_FILES} ${HEADER_FILES})

root/calendar_tests:

project(calendars_tests)

add_subdirectory(lib/gtest-1.7.0)
add_subdirectory(basic_tests)

root/calendar_tests/basic_tests:

include_directories(${gtest_SOURCE_DIR}/include ${gtest_SOURCE_DIR})

add_executable(runBasicCalendarTests
        basic_check.cpp
        calendar_check.cpp)

target_link_libraries(runBasicCalendarTests gtest gtest_main)
target_link_libraries(runBasicCalendarTests calendars)

Answer 1

你必须阅读这个answer来自这个问题:What is the difference between #include < filename> and #include “filename”?

特别是，当 piCookie 说:

A preprocessing directive of the form

#include "q-char-sequence" new-line

causes the replacement of that directive by the entire contents of the source file identified by the specified sequence between the " delimiters. The named source file is searched for in an implementation-defined manner. If this search is not supported, or if the search fails, the directive is reprocessed as if it read

#include <h-char-sequence> new-line

with the identical contained sequence (including > characters, if any) from the original directive.

阅读完后请注意 CMakeLists.txt 中的这一行:

include_directories(calendars)

您要求 cmake 包含 calendars 目录以包含搜索路径。