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# Go is an optional dependency. It's a necessary dependency if running tests or
# the FIPS build, which will check these.
find_program(GO_EXECUTABLE go)
function(require_go)
if(NOT GO_EXECUTABLE)
message(FATAL_ERROR "Could not find Go")
endif()
endfunction()
function(go_executable dest package)
require_go()
set(godeps "${PROJECT_SOURCE_DIR}/util/godeps.go")
if(NOT CMAKE_GENERATOR STREQUAL "Ninja")
# The DEPFILE parameter to add_custom_command only works with Ninja. Query
# the sources at configure time. Additionally, everything depends on go.mod.
# That affects what external packages to use.
#
# TODO(davidben): Starting CMake 3.20, it also works with Make. Starting
# 3.21, it works with Visual Studio and Xcode too.
execute_process(COMMAND ${GO_EXECUTABLE} run ${godeps} -format cmake
-pkg ${package}
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
OUTPUT_VARIABLE sources
RESULT_VARIABLE godeps_result)
add_custom_command(OUTPUT ${dest}
COMMAND ${GO_EXECUTABLE} build
-o ${CMAKE_CURRENT_BINARY_DIR}/${dest} ${package}
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
DEPENDS ${sources} ${PROJECT_SOURCE_DIR}/go.mod)
else()
# Ninja expects the target in the depfile to match the output. This is a
# relative path from the build directory.
binary_dir_relative_path(${dest} target)
set(depfile "${CMAKE_CURRENT_BINARY_DIR}/${dest}.d")
add_custom_command(OUTPUT ${dest}
COMMAND ${GO_EXECUTABLE} build
-o ${CMAKE_CURRENT_BINARY_DIR}/${dest} ${package}
COMMAND ${GO_EXECUTABLE} run ${godeps} -format depfile
-target ${target} -pkg ${package} -out ${depfile}
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
DEPENDS ${godeps} ${PROJECT_SOURCE_DIR}/go.mod
DEPFILE ${depfile})
endif()
endfunction()
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