1 files changed, 47 insertions, 0 deletions
diff --git a/vcpkg/scripts/cmake/vcpkg_check_linkage.cmake b/vcpkg/scripts/cmake/vcpkg_check_linkage.cmake
new file mode 100644
index 0000000..80070ca
--- /dev/null
+++ b/vcpkg/scripts/cmake/vcpkg_check_linkage.cmake
@@ -0,0 +1,47 @@
+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()