cmake: Fix multiple include of CURL package #12300
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Prevent target with the same name already exists error
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Duplicate of #11913 Attempts to reproduce this issue so far failed. |
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I finally managed to replicate, thanks for your example. The key seems to be that |
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I commented on the original issue, this appears to be CMP0107 policy (introduced 3.18) |
vszakats
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Nov 10, 2023
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
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Prevent target with the same name already exists error
It can easily happen in larger composed CMake projects that the CURL config is included more than once, the normal targets have code to prevent multiple inclusion (in
CURLTargets.cmake), but the ALIAS needs a guard as well as it is inCURLConfig.cmakeYou can test with a basic CMake