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#[===[.md:
# vcpkg_check_linkage
Asserts the available library and CRT linkage options for the port.
## Usage
```cmake
vcpkg_check_linkage(
[ONLY_STATIC_LIBRARY | ONLY_DYNAMIC_LIBRARY]
[ONLY_STATIC_CRT | ONLY_DYNAMIC_CRT]
)
```
## Parameters
### ONLY_STATIC_LIBRARY
Indicates that this port can only be built with static library linkage.
Note: If the user requested a dynamic build ONLY_STATIC_LIBRARY will result in a note being printed, not a fatal error.
### ONLY_DYNAMIC_LIBRARY
Indicates that this port can only be built with dynamic/shared library linkage.
### ONLY_STATIC_CRT
Indicates that this port can only be built with static CRT linkage.
### ONLY_DYNAMIC_CRT
Indicates that this port can only be built with dynamic/shared CRT linkage.
## Notes
This command will either alter the settings for `VCPKG_LIBRARY_LINKAGE` or fail, depending on what was requested by the user versus what the library supports.
## Examples
* [abseil](https://github.com/Microsoft/vcpkg/blob/master/ports/abseil/portfile.cmake)
#]===]
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")
message(STATUS "Note: ${PORT} only supports dynamic library linkage. Building dynamic library.")
if("${VCPKG_CRT_LINKAGE}" STREQUAL "static")
message(FATAL_ERROR "Refusing to build unexpected dynamic library against the static CRT.
If this is desired, please configure your triplet to directly request this configuration.")
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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