c++ - CMake 错误 : MYSQL_INCLUDE_DIR not found

Question

我正在尝试在 C++ 中与 MySQL 建立连接。为此，我正在使用 sqlpp11它是 connector .

1. sqlpp11 成功构建。

2. sqllpp11-connector-mysql 由于某些 cmake 错误而未正确构建。

   CMake 错误:此项目中使用了以下变量，但它们被设置为 NOTFOUND。 请设置它们或确保在 CMake 文件中正确设置和测试它们: MYSQL_INCLUDE_DIR(高级)

这就是我的 CmakeList.txt 的样子

cmake_minimum_required(VERSION 3.2)
include(CheckCXXSymbolExists)
project (sqlpp11-connector-mysql)
enable_testing()
set(CMAKE_CXX_STANDARD 11)

check_cxx_symbol_exists(_LIBCPP_VERSION iostream HAS_LIBCPP_VERSION)
if (HAS_LIBCPP_VERSION)
    message("libc++ does not have thread_local, thus we need to wrap that via boost thread")
    find_package(Boost COMPONENTS thread)
endif()


set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
find_package(MySql REQUIRED)

message(STATUS "Using ${CMAKE_CXX_COMPILER} (compiler id: ${CMAKE_CXX_COMPILER_ID})")

set(DATE_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../date" CACHE FILEPATH "Path to Howard Hinnant's date library")

if(NOT EXISTS ${DATE_INCLUDE_DIR}/date.h)
    message(SEND_ERROR "Can't find file date.h")
    message("Can't find date.h in ${DATE_INCLUDE_DIR} ")
    message("Please either")
    message("  - git clone https://github.com/howardhinnant/date ${DATE_INCLUDE_DIR}")
    message("  - download and unzip a current version from https://github.com/howardhinnant/date to ${DATE_INCLUDE_DIR}")
    message("  - set DATE_INCLUDE_DIR to point to the dir containing date.h from the date library")
    message("")
else()
    message("including date from ${DATE_INCLUDE_DIR}")
endif()

set(SQLPP11_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../sqlpp11/include" CACHE FILEPATH "Path to sqlpp11 includes")

if(NOT EXISTS ${SQLPP11_INCLUDE_DIR}/sqlpp11/sqlpp11.h)
    message(SEND_ERROR "Can't find file sqlpp11/sqlpp11.h")
    message("Can't find sqlpp11/sqlpp11.h in ${SQLPP11_INCLUDE_DIR} ")
    message("Please either")
    message("  - git clone https://github.com/rbock/sqlpp11 ${SQLPP11_INCLUDE_DIR}")
    message("  - download and unzip a current version from https://github.com/rbock/sqlpp11 to ${SQLPP11_INCLUDE_DIR}")
    message("  - set DATE_INCLUDE_DIR to point to the dir containing sqlpp11/sqlpp11.h")
    message("")
else()
    message("including sqlpp11 from ${SQLPP11_INCLUDE_DIR}")
endif()

set(MYSQL_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../include/sqlpp11/mysql" CACHE FILEPATH "PATH TO sqllpp11/mysql")

include_directories("${SQLPP11_INCLUDE_DIR}")
include_directories("${DATE_INCLUDE_DIR}")
include_directories("${MYSQL_INCLUDE_DIRS}")
set(include_dir "${PROJECT_SOURCE_DIR}/include")
file(GLOB_RECURSE sqlpp_headers ${include_dir}/*.h ${SQLPP11_INCLUDE_DIR}/*.h)
include_directories(${include_dir})

add_subdirectory(src)
add_subdirectory(tests)

install(DIRECTORY "${PROJECT_SOURCE_DIR}/include/sqlpp11" DESTINATION include)

Answer 1

sqlpp11-connector-mysql 中提供的默认CmakeList.txt是完美的。我不需要编辑它。

除此之外，我还需要安装 libmysqlclient-dev，它的工作原理非常棒。