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function(vcpkg_check_linkage)
cmake_parse_arguments(PARSE_ARGV 0 arg
"ONLY_STATIC_LIBRARY;ONLY_DYNAMIC_LIBRARY;ONLY_DYNAMIC_CRT;ONLY_STATIC_CRT"
""
""
)
if(DEFINED arg_UNPARSED_ARGUMENTS)
message(WARNING "${CMAKE_CURRENT_FUNCTION} was passed extra arguments: ${arg_UNPARSED_ARGUMENTS}")
endif()
if(arg_ONLY_STATIC_LIBRARY AND arg_ONLY_DYNAMIC_LIBRARY)
message(FATAL_ERROR "Requesting both ONLY_STATIC_LIBRARY and ONLY_DYNAMIC_LIBRARY; this is an error.")
endif()
if(arg_ONLY_STATIC_CRT AND arg_ONLY_DYNAMIC_CRT)
message(FATAL_ERROR "Requesting both ONLY_STATIC_CRT and ONLY_DYNAMIC_CRT; this is an error.")
endif()
if(arg_ONLY_STATIC_LIBRARY AND "${VCPKG_LIBRARY_LINKAGE}" STREQUAL "dynamic")
message(STATUS "Note: ${PORT} only supports static library linkage. Building static library.")
set(VCPKG_LIBRARY_LINKAGE static PARENT_SCOPE)
elseif(arg_ONLY_DYNAMIC_LIBRARY AND "${VCPKG_LIBRARY_LINKAGE}" STREQUAL "static")
if("${VCPKG_CRT_LINKAGE}" STREQUAL "static")
message(FATAL_ERROR "This port can only build as a dynamic library, but the triplet \
selects a static library and a static CRT. Building a dynamic library with a static CRT creates \
conditions many developers find surprising, and for which most ports are unprepared. Therefore, \
vcpkg fails rather than changing VCPKG_LIBRARY_LINKAGE to dynamic.\
Consider choosing a triplet that sets VCPKG_CRT_LINKAGE to dynamic. For more information, \
explicitly requesting this configuration in a custom triplet, please see \
https://learn.microsoft.com/vcpkg/maintainers/functions/vcpkg_check_linkage?WT.mc_id=vcpkg_inproduct_cli#notes \
If you can edit the port calling vcpkg_check_linkage that emits this message, consider adding \
!(static & staticcrt) to the \"supports\" expression so that this combination can fail early.")
else()
message(STATUS "Note: ${PORT} only supports dynamic library linkage. Building dynamic library.")
endif()
set(VCPKG_LIBRARY_LINKAGE dynamic PARENT_SCOPE)
endif()
if(arg_ONLY_DYNAMIC_CRT AND "${VCPKG_CRT_LINKAGE}" STREQUAL "static")
message(FATAL_ERROR "${PORT} only supports dynamic crt linkage")
elseif(arg_ONLY_STATIC_CRT AND "${VCPKG_CRT_LINKAGE}" STREQUAL "dynamic")
message(FATAL_ERROR "${PORT} only supports static crt linkage")
endif()
endfunction()
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