最近开发的一个项目依赖 libgeotiff，同时 libgeotiff 又依赖 libtiff，我将他们都加入 thirdparty 中，通过 add_subdirectory 添加进项目中。
- thirdparty
- CMakeLists.txt
- libgeotiff
- libtiff
add_subdirectory(libtiff)
add_subdirectory(libgeotiff/libgeotiff)这样 CMake 仍会报错:
CMake Error at /usr/local/lib/python3.10/dist-packages/cmake/data/share/cmake-3.25/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
Could NOT find TIFF (missing: TIFF_LIBRARY TIFF_INCLUDE_DIR)
因为 find_package 无法查找项目内的目标。
可以通过 FetchContent 来解决这个问题:
include(FetchContent)
FetchContent_Declare(
TIFF
SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/libtiff"
OVERRIDE_FIND_PACKAGE
)
add_subdirectory(libgeotiff)