CMake 無法找到 SDL2_ttf，我正在嘗試以與 SDL2 相同的方式鏈接它，並且兩者都正確安裝在 Ubuntu 18.04

Question

我得到錯誤：

CMake Error at CMakeLists.txt:11 (find_package):
  By not providing "FindSDL2_ttf.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "SDL2_ttf",
  but CMake did not find one.

  Could not find a package configuration file provided by "SDL2_ttf" with any
  of the following names:

    SDL2_ttfConfig.cmake
    sdl2_ttf-config.cmake

  Add the installation prefix of "SDL2_ttf" to CMAKE_PREFIX_PATH or set
  "SDL2_ttf_DIR" to a directory containing one of the above files.  If
  "SDL2_ttf" provides a separate development package or SDK, be sure it has
  been installed.

---

這是我的 cmake 文件的樣子：

cmake_minimum_required(VERSION 3.14)
project(Smithereens)

set(CMAKE_CXX_STANDARD 17)

add_executable(Smithereens main.cpp)

find_package(SDL2 REQUIRED)
include_directories(${SDL2_INCLUDE_DIRS})

find_package(SDL2_ttf REQUIRED)
include_directories(${SDL2_ttf_INCLUDE_DIRS})

target_link_libraries(Smithereens ${SDL2_LIBRARIES} ${SDL2_ttf_LIBRARIES})

SDL2 和 SDL2_ttf 都安裝在我的機器上，我確定我只是鏈接不正確，學習 CMake 對我來說是一個巨大的頭痛。

Answer 1

這對我來說效果很好，Ubuntu 18.04。

INCLUDE(FindPkgConfig)
PKG_SEARCH_MODULE(SDL2 REQUIRED sdl2)
PKG_SEARCH_MODULE(SDL2IMAGE REQUIRED SDL2_image>=2.0.0)
PKG_SEARCH_MODULE(SDL2TTF REQUIRED SDL2_ttf>=2.0.0)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

set(SOURCE_FILES main.cpp)

add_executable(${PROJECT_NAME} ${SOURCE_FILES})

target_include_directories(${PROJECT_NAME} PRIVATE
    include ${SDL2_INCLUDE_DIRS} ${SDL2IMAGE_INCLUDE_DIRS} ${SDL2TTF_INCLUDE_DIRS})

target_link_libraries(${PROJECT_NAME} PRIVATE
    ${SDL2_LIBRARIES} ${SDL2IMAGE_LIBRARIES} ${SDL2TTF_LIBRARIES})