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cmake: fix multiple include of CURL package

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Fixes errors on second `find_package(CURL)`. This is a frequent case
with transitive dependencies:
```
CMake Error at ...:
  add_library cannot create ALIAS target "CURL::libcurl" because another
  target with the same name already exists.
```

Test to reproduce:
```cmake
cmake_minimum_required(VERSION 3.27)  # must be 3.18 or higher

project(curl)

set(CURL_DIR "example/lib/cmake/CURL/")
find_package(CURL CONFIG REQUIRED)
find_package(CURL CONFIG REQUIRED)  # fails

add_executable(main main.c)
target_link_libraries(main CURL::libcurl)
```

Ref: https://cmake.org/cmake/help/latest/release/3.18.html#other-changes
Ref: https://cmake.org/cmake/help/v3.18/policy/CMP0107.html
Ref: #12300
Assisted-by: Harry Mallon
Closes #11913
This commit is contained in:
Kai Pastor 2023-09-22 07:48:36 +02:00 committed by Viktor Szakats
parent 9fb6cc54c5
commit 45d2ff6f85
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1 changed files with 3 additions and 1 deletions
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CMake/curl-config.cmake.in
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@ -35,4 +35,6 @@ include("${CMAKE_CURRENT_LIST_DIR}/@TARGETS_EXPORT_NAME@.cmake")
check_required_components("@PROJECT_NAME@")
# Alias for either shared or static library
add_library(@PROJECT_NAME@::libcurl ALIAS @PROJECT_NAME@::@LIB_SELECTED@)
if(NOT TARGET @PROJECT_NAME@::libcurl)
add_library(@PROJECT_NAME@::libcurl ALIAS @PROJECT_NAME@::@LIB_SELECTED@)
endif()