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+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[=======================================================================[.rst:
+CMakeForceCompiler
+------------------
+
+.. deprecated:: 3.6
+
+  Do not use.
+
+The macros provided by this module were once intended for use by
+cross-compiling toolchain files when CMake was not able to automatically
+detect the compiler identification.  Since the introduction of this module,
+CMake's compiler identification capabilities have improved and can now be
+taught to recognize any compiler.  Furthermore, the suite of information
+CMake detects from a compiler is now too extensive to be provided by
+toolchain files using these macros.
+
+One common use case for this module was to skip CMake's checks for a
+working compiler when using a cross-compiler that cannot link binaries
+without special flags or custom linker scripts.  This case is now supported
+by setting the :variable:`CMAKE_TRY_COMPILE_TARGET_TYPE` variable in the
+toolchain file instead.
+
+-------------------------------------------------------------------------
+
+Macro ``CMAKE_FORCE_C_COMPILER`` has the following signature:
+
+::
+
+   CMAKE_FORCE_C_COMPILER(<compiler> <compiler-id>)
+
+It sets :variable:`CMAKE_C_COMPILER <CMAKE_<LANG>_COMPILER>` to
+the given compiler and the cmake internal variable
+:variable:`CMAKE_C_COMPILER_ID <CMAKE_<LANG>_COMPILER_ID>` to the given
+compiler-id.  It also bypasses the check for working compiler and basic
+compiler information tests.
+
+Macro ``CMAKE_FORCE_CXX_COMPILER`` has the following signature:
+
+::
+
+   CMAKE_FORCE_CXX_COMPILER(<compiler> <compiler-id>)
+
+It sets :variable:`CMAKE_CXX_COMPILER <CMAKE_<LANG>_COMPILER>` to
+the given compiler and the cmake internal variable
+:variable:`CMAKE_CXX_COMPILER_ID <CMAKE_<LANG>_COMPILER_ID>` to the given
+compiler-id.  It also bypasses the check for working compiler and basic
+compiler information tests.
+
+Macro ``CMAKE_FORCE_Fortran_COMPILER`` has the following signature:
+
+::
+
+   CMAKE_FORCE_Fortran_COMPILER(<compiler> <compiler-id>)
+
+It sets :variable:`CMAKE_Fortran_COMPILER <CMAKE_<LANG>_COMPILER>` to
+the given compiler and the cmake internal variable
+:variable:`CMAKE_Fortran_COMPILER_ID <CMAKE_<LANG>_COMPILER_ID>` to the given
+compiler-id.  It also bypasses the check for working compiler and basic
+compiler information tests.
+
+So a simple toolchain file could look like this:
+
+::
+
+   include (CMakeForceCompiler)
+   set(CMAKE_SYSTEM_NAME Generic)
+   CMAKE_FORCE_C_COMPILER   (chc12 MetrowerksHicross)
+   CMAKE_FORCE_CXX_COMPILER (chc12 MetrowerksHicross)
+#]=======================================================================]
+
+macro(CMAKE_FORCE_C_COMPILER compiler id)
+  message(DEPRECATION "The CMAKE_FORCE_C_COMPILER macro is deprecated.  "
+    "Instead just set CMAKE_C_COMPILER and allow CMake to identify the compiler.")
+  set(CMAKE_C_COMPILER "${compiler}")
+  set(CMAKE_C_COMPILER_ID_RUN TRUE)
+  set(CMAKE_C_COMPILER_ID ${id})
+  set(CMAKE_C_COMPILER_FORCED TRUE)
+
+  # Set old compiler id variables.
+  if(CMAKE_C_COMPILER_ID MATCHES "GNU")
+    set(CMAKE_COMPILER_IS_GNUCC 1)
+  endif()
+endmacro()
+
+macro(CMAKE_FORCE_CXX_COMPILER compiler id)
+  message(DEPRECATION "The CMAKE_FORCE_CXX_COMPILER macro is deprecated.  "
+    "Instead just set CMAKE_CXX_COMPILER and allow CMake to identify the compiler.")
+  set(CMAKE_CXX_COMPILER "${compiler}")
+  set(CMAKE_CXX_COMPILER_ID_RUN TRUE)
+  set(CMAKE_CXX_COMPILER_ID ${id})
+  set(CMAKE_CXX_COMPILER_FORCED TRUE)
+
+  # Set old compiler id variables.
+  if("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
+    set(CMAKE_COMPILER_IS_GNUCXX 1)
+  endif()
+endmacro()
+
+macro(CMAKE_FORCE_Fortran_COMPILER compiler id)
+  message(DEPRECATION "The CMAKE_FORCE_Fortran_COMPILER macro is deprecated.  "
+    "Instead just set CMAKE_Fortran_COMPILER and allow CMake to identify the compiler.")
+  set(CMAKE_Fortran_COMPILER "${compiler}")
+  set(CMAKE_Fortran_COMPILER_ID_RUN TRUE)
+  set(CMAKE_Fortran_COMPILER_ID ${id})
+  set(CMAKE_Fortran_COMPILER_FORCED TRUE)
+
+  # Set old compiler id variables.
+  if(CMAKE_Fortran_COMPILER_ID MATCHES "GNU")
+    set(CMAKE_COMPILER_IS_GNUG77 1)
+  endif()
+endmacro()