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CMake: Protects against double find_package

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Boost iostream uses `find_package` in quiet mode and then again uses
`find_package` with required. This second call triggers a 
`add_library cannot create imported target "ZLIB::ZLIB" because another
target with the same name already exists.`

This can simply be fixed by skipping the alias part on secondary
`find_package` runs.
This commit is contained in:
Benjamin Buch 2023-06-06 15:32:45 +02:00 committed by GitHub
parent 045d7aae28
commit 0d94ba6922
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 9 additions and 7 deletions
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14
CMakeLists.txt
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@ -889,13 +889,15 @@ write_basic_package_version_file(
set(LZMA_CONFIG_CONTENTS set(LZMA_CONFIG_CONTENTS
"include(\"\${CMAKE_CURRENT_LIST_DIR}/liblzma-targets.cmake\") "include(\"\${CMAKE_CURRENT_LIST_DIR}/liblzma-targets.cmake\")
# Be compatible with the spelling used by the FindLibLZMA module. This if(NOT TARGET LibLZMA::LibLZMA)
# doesn't use ALIAS because it would make CMake resolve LibLZMA::LibLZMA # Be compatible with the spelling used by the FindLibLZMA module. This
# to liblzma::liblzma instead of keeping the original spelling. Keeping # doesn't use ALIAS because it would make CMake resolve LibLZMA::LibLZMA
# the original spelling is important for good FindLibLZMA compatibility. # to liblzma::liblzma instead of keeping the original spelling. Keeping
add_library(LibLZMA::LibLZMA INTERFACE IMPORTED) # the original spelling is important for good FindLibLZMA compatibility.
set_target_properties(LibLZMA::LibLZMA PROPERTIES add_library(LibLZMA::LibLZMA INTERFACE IMPORTED)
set_target_properties(LibLZMA::LibLZMA PROPERTIES
INTERFACE_LINK_LIBRARIES liblzma::liblzma) INTERFACE_LINK_LIBRARIES liblzma::liblzma)
endif()
") ")
if(ENABLE_THREADS STREQUAL "posix") if(ENABLE_THREADS STREQUAL "posix")