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#[===[.md:
# vcpkg_fail_port_install
Checks common requirements and fails the current portfile with a (default) error message
## Usage
```cmake
vcpkg_fail_port_install(
[ALWAYS]
[MESSAGE <"Reason for failure">]
[ON_TARGET <Windows> [<OSX> ...]]
[ON_ARCH <x64> [<arm> ...]]
[ON_CRT_LINKAGE <static> [<dynamic> ...]])
[ON_LIBRARY_LINKAGE <static> [<dynamic> ...]]
)
```
## Parameters
### MESSAGE
Additional failure message. If none is given, a default message will be displayed depending on the failure condition.
### ALWAYS
Will always fail early
### ON_TARGET
Targets for which the build should fail early. Valid targets are `<target>` from `VCPKG_IS_TARGET_<target>` (see `vcpkg_common_definitions.cmake`).
### ON_ARCH
Architecture for which the build should fail early.
### ON_CRT_LINKAGE
CRT linkage for which the build should fail early.
### ON_LIBRARY_LINKAGE
Library linkage for which the build should fail early.
## Examples
* [aws-lambda-cpp](https://github.com/Microsoft/vcpkg/blob/master/ports/aws-lambda-cpp/portfile.cmake)
#]===]
function(vcpkg_fail_port_install)
cmake_parse_arguments(PARSE_ARGV 0 "arg" "ALWAYS" "MESSAGE" "ON_TARGET;ON_ARCH;ON_CRT_LINKAGE;ON_LIBRARY_LINKAGE")
if(DEFINED arg_UNPARSED_ARGUMENTS)
message(FATAL_ERROR "vcpkg_fail_port_install was passed extra arguments: ${arg_UNPARSED_ARGUMENTS}")
endif()
if(DEFINED arg_MESSAGE)
string(APPEND arg_MESSAGE "\n")
else()
set(arg_MESSAGE "")
endif()
set(fail_port)
# Target fail check
if(DEFINED arg_ON_TARGET)
foreach(target IN LISTS arg_ON_TARGET)
string(TOUPPER "${target}" target_upper)
if(VCPKG_TARGET_IS_${target_upper})
set(fail_port TRUE)
string(APPEND arg_MESSAGE "Target '${target}' not supported by ${PORT}!\n")
endif()
endforeach()
endif()
# Architecture fail check
if(DEFINED arg_ON_ARCH)
foreach(arch IN LISTS arg_ON_ARCH)
if(VCPKG_TARGET_ARCHITECTURE STREQUAL arch)
set(fail_port TRUE)
string(APPEND arg_MESSAGE "Architecture '${arch}' not supported by ${PORT}!\n")
endif()
endforeach()
endif()
# CRT linkage fail check
if(DEFINED arg_ON_CRT_LINKAGE)
foreach(crt_linkage IN LISTS arg_ON_CRT_LINKAGE)
if(VCPKG_CRT_LINKAGE STREQUAL crt_linkage)
set(fail_port TRUE)
string(APPEND arg_MESSAGE "CRT linkage '${VCPKG_CRT_LINKAGE}' not supported by ${PORT}!\n")
endif()
endforeach()
endif()
# Library linkage fail check
if(DEFINED arg_ON_LIBRARY_LINKAGE)
foreach(library_linkage IN LISTS arg_ON_LIBRARY_LINKAGE)
if(VCPKG_LIBRARY_LINKAGE STREQUAL library_linkage)
set(fail_port TRUE)
string(APPEND arg_MESSAGE "Library linkage '${VCPKG_LIBRARY_LINKAGE}' not supported by ${PORT}!\n")
endif()
endforeach()
endif()
if(fail_port OR arg_ALWAYS)
message(FATAL_ERROR ${arg_MESSAGE})
endif()
endfunction()
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