# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

# determine the compiler to use for Go programs
# NOTE, a generator may set CMAKE_Go_COMPILER before
# loading this file to force a compiler.

if(NOT CMAKE_Go_COMPILER)
  # prefer the environment variable CC
  if(NOT $ENV{GO_COMPILER} STREQUAL "")
    get_filename_component(CMAKE_Go_COMPILER_INIT $ENV{GO_COMPILER} PROGRAM PROGRAM_ARGS CMAKE_Go_FLAGS_ENV_INIT)
    if(CMAKE_Go_FLAGS_ENV_INIT)
      set(CMAKE_Go_COMPILER_ARG1 "${CMAKE_Go_FLAGS_ENV_INIT}" CACHE STRING "First argument to Go compiler")
    endif()
    if(NOT EXISTS ${CMAKE_Go_COMPILER_INIT})
      message(SEND_ERROR "Could not find compiler set in environment variable GO_COMPILER:\n$ENV{GO_COMPILER}.")
    endif()
  endif()

  set(Go_BIN_PATH
    $ENV{GOPATH}
    $ENV{GOROOT}
    $ENV{GOROOT}/../bin
    $ENV{GO_COMPILER}
    /usr/bin
    /usr/local/bin
    )
  # if no compiler has been specified yet, then look for one
  if(CMAKE_Go_COMPILER_INIT)
    set(CMAKE_Go_COMPILER ${CMAKE_Go_COMPILER_INIT} CACHE PATH "Go Compiler")
  else()
    find_program(CMAKE_Go_COMPILER
      NAMES go
      PATHS ${Go_BIN_PATH}
    )
  endif()
endif()
mark_as_advanced(CMAKE_Go_COMPILER)

# configure variables set in this file for fast reload later on
configure_file(${CMAKE_CURRENT_LIST_DIR}/CMakeGoCompiler.cmake.in
  ${CMAKE_PLATFORM_INFO_DIR}/CMakeGoCompiler.cmake @ONLY)
set(CMAKE_Go_COMPILER_ENV_VAR "GO_COMPILER")