为什么 spdlog/pthread 包含目录在 macos 上的 CMake 中通过 pkg_search_modul

Question

环境

• 操作系统：macOS
• 包管理器：自制软件
• 构建工具：cmake，pkg-config，clang
• 存储库：https://github.com/xedit/xedit

它们都是最新版本。

CMakeList.txt

CMakeLists.txt是：

project(xeditd LANGUAGES CXX VERSION 0.1)
find_package(PkgConfig REQUIRED)
pkg_search_module(ICU_UC icu-uc)
pkg_search_module(SPDLOG spdlog)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14 -Wall")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${ICU_UC_CXXFLAGS_OTHER}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${SPDLOG_CXXFLAGS_OTHER}")
set(SRC_FILE
    xeditd.cpp
    )
set(LIB_DIR
    ${ICU_UC_LIBRARY_DIRS}
    ${SPDLOG_LIBRARY_DIRS}
    )
set(LIB
    ${ICU_UC_LIBRARIES}
    ${SPDLOG_LIBRARIES}
    )
set(INC_DIR
    ${ICU_UC_INCLUDE_DIRS}
    ${SPDLOG_INCLUDE_DIRS}
    )
message(ICU_UC_CXXFLAGS_OTHER: ${ICU_UC_CXXFLAGS_OTHER})
message(SPDLOG_CXXFLAGS_OTHER: ${SPDLOG_CXXFLAGS_OTHER})
message(ICU_UC_LIBRARY_DIRS: ${ICU_UC_LIBRARY_DIRS})
message(SPDLOG_LIBRARY_DIRS: ${SPDLOG_LIBRARY_DIRS})
message(ICU_UC_LIBRARIES: ${ICU_UC_LIBRARIES})
message(SPDLOG_LIBRARIES: ${SPDLOG_LIBRARIES})
message(ICU_UC_INCLUDE_DIRS: ${ICU_UC_INCLUDE_DIRS})
message(SPDLOG_INCLUDE_DIRS: ${SPDLOG_INCLUDE_DIRS})
link_directories(${LIB_DIR})
add_executable(xeditd ${SRC_FILE})
target_include_directories(xeditd PUBLIC ${INC_DIR})
target_link_libraries(xeditd ${LIB})

错误

该消息显示：

ICU_UC_CXXFLAGS_OTHER:
SPDLOG_CXXFLAGS_OTHER:
ICU_UC_LIBRARY_DIRS:/usr/local/Cellar/icu4c/64.2/lib
SPDLOG_LIBRARY_DIRS:
ICU_UC_LIBRARIES:icuucicudata
SPDLOG_LIBRARIES:
ICU_UC_INCLUDE_DIRS:/usr/local/Cellar/icu4c/64.2/include
SPDLOG_INCLUDE_DIRS:

找不到头文件<spdlog/spdlog.h>。显然，spdlog 头目录不包含在 cmake 中。

问题

为什么pkg_search_module适用于icu4c，错误不适用于spdlog？而不是为了pthread？

Answer 1

IF(APPLE)
    FIND_PACKAGE(spdlog REQUIRED)
ENDIF(APPLE)
...
# Translation is your traget
IF(APPLE)
    target_link_libraries(Translation PUBLIC spdlog::spdlog)
ENDIF(APPLE)