I have an external CMake project that gets exported on install. The root
project uses it as a package. The external project must be installed
prior being used as a package.
I can solve this problem by using `ExternalProject` for both projects
and declare their dependency. My setup is different, though, as the root
project depends on an external project. Since I am including the
external project without it having installed on system I am not sure if
it is correct to use the package as downstream or whether upstream
should be applied instead.
Consider the following project structure:
my_test
├── cmake
├── extern
│ └── mylibrary
│ ├── cmake
│ ├── include
│ │ └── my_library
│ └── src
├── include
│ └── my_test
└── src
`mylibrary` is a standalone project with `export` on install to use its
library as package.
`my_test` (root) is another project that depends on `mylibrary`.
CMakeLists.txt:
```
# add dependencies
add_subdirectory( extern )
add_subdirectory( src )
```
extern/CMakeLists.txt:
```
ExternalProject_Add(mylibrary
CMAKE_ARGS
-D CMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}
SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/mylibrary"
)
```
src/CMakeLists.txt:
```c
list( APPEND CMAKE_PREFIX_PATH "${CMAKE_BINARY_DIR}" )
find_package( my_library REQUIRED )
#=============================
# Define targets
#=============================
add_executable( MyTestProject test.cpp )
add_dependencies(MyTestProject my_library-exportname)
target_link_libraries( MyTestProject PUBLIC my_library-exportname)
```
I added `add_dependencies` to have `my_library` be installed prior to
building `my_test`. However, build fails even before that since I have
`find_package()` in the same CMake txt file.
*How can I setup my install as dependency for a package?*
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