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# Copyright Louis Dionne 2013-2017
# Copyright Markus J. Weber 2015
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
#
#
# This CMake module checks whether the current compiler is supported, and
# provides friendly hints to the user.
if (${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang")
if (${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS "3.9.1")
message(WARNING "
### You appear to be using Clang ${CMAKE_CXX_COMPILER_VERSION}, which is known
### to be unable to compile Hana. Consider switching to
### Clang >= 3.9.1. If it is already installed on your
### system, you can tell CMake about it with
###
### cmake .. -DCMAKE_CXX_COMPILER=/path/to/clang
")
endif()
if (MSVC)
if(${MSVC_VERSION} LESS 1900)
message(WARNING "
###
### We detected that you were using Clang for Windows with a
### -fms-compatibility-version parameter lower than 19. Only
### -fms-compatibility-version=19 and above are supported by
### Hana for lack of proper C++14 support prior for versions
### below that.
###
### If this diagnostic is wrong and you are not using
### -fms-compatibility-version, please file an issue at
### https://github.com/boostorg/hana/issues.
###
")
endif()
endif()
elseif (${CMAKE_CXX_COMPILER_ID} STREQUAL "AppleClang")
if (${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS "6.1.0")
message(WARNING "
### You appear to be using Apple's Clang ${CMAKE_CXX_COMPILER_VERSION}, which is
### shipped with Xcode < 6.3. Unfortunately, only Apple's Clang
### >= 6.1.0 (shipped with Xcode >= 6.3) can compile Hana.
### You should consider updating to Xcode >= 6.3 (requires Yosemite)
### or using a non-Apple Clang >= 3.9.1, which can be installed via
### Homebrew with
###
### brew install llvm --with-clang
###
### You can then tell CMake to use that non-system Clang with
###
### cmake .. -DCMAKE_CXX_COMPILER=/path/to/clang
")
endif()
elseif (${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU")
if (${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS "6.0.0")
message(WARNING "
### You appear to be using GCC ${CMAKE_CXX_COMPILER_VERSION}, which is known to be
### unable to compile Hana. Only GCC >= 6.0.0 is supported.
### Consider using a more recent GCC or switching to Clang.
### If a more recent compiler is already installed on your
### system, you can tell CMake to use it with
###
### cmake .. -DCMAKE_CXX_COMPILER=/path/to/compiler
")
endif()
elseif (MSVC)
message(WARNING "
### Using the native Microsoft compiler (MSVC) is not supported for lack
### of proper C++14 support. However, you can install pre-built Clang for
### Windows binaries (with Visual Studio integration if desired) at
### http://llvm.org/releases/download.html.
###
### More information about how to set up Hana with Clang for Windows is
### available on Hana's wiki at http://git.io/vBYIp.
")
else()
message(WARNING "
### You appear to be using a compiler that is not yet tested with Hana.
### Please tell us whether it successfully compiles or if and how it
### fails by opening an issue at https://github.com/boostorg/hana/issues.
### Thanks!
")
endif()
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