Move Go CMake support into its own file.

Slowly reduce clutter in the top-level CMake file.

Change-Id: Ib7ca2aee7337db82ed1989c56bbaaf6ee5da0768
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/56569
Reviewed-by: Bob Beck <bbe@google.com>
Commit-Queue: David Benjamin <davidben@google.com>

1 files changed, 3 insertions, 49 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a2d45ae..9fa818c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,6 +16,7 @@ if(WIN32)
 endif()
 
 include(sources.cmake)
+include(cmake/go.cmake)
 include(cmake/perlasm.cmake)
 
 enable_language(C)
@@ -29,17 +30,13 @@ include(GNUInstallDirs)
 add_custom_target(global_target)
 
 if(ANDROID)
-  # Android-NDK CMake files reconfigure the path and so Go and Perl won't be
-  # found. However, ninja will still find them in $PATH if we just name them.
+  # Android-NDK CMake files reconfigure the path and so Perl won't be found.
+  # However, ninja will still find them in $PATH if we just name them.
   if(NOT PERL_EXECUTABLE)
     set(PERL_EXECUTABLE "perl")
   endif()
-  if(NOT GO_EXECUTABLE)
-    set(GO_EXECUTABLE "go")
-  endif()
 else()
   find_package(Perl REQUIRED)
-  find_program(GO_EXECUTABLE go)
 endif()
 
 if(CMAKE_SYSTEM_NAME STREQUAL "Linux" AND NOT CMAKE_CROSSCOMPILING)
@@ -56,10 +53,6 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Linux" AND NOT CMAKE_CROSSCOMPILING)
   endif()
 endif()
 
-if(NOT GO_EXECUTABLE)
-  message(FATAL_ERROR "Could not find Go")
-endif()
-
 if(USE_CUSTOM_LIBCXX)
   set(BORINGSSL_ALLOW_CXX_RUNTIME 1)
 endif()
@@ -365,45 +358,6 @@ if(MALLOC_FAILURE_TESTING)
   add_definitions(-DBORINGSSL_MALLOC_FAILURE_TESTING)
 endif()
 
-function(go_executable dest package)
-  set(godeps "${CMAKE_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} ${CMAKE_SOURCE_DIR}/go.mod)
-  else()
-    # Ninja expects the target in the depfile to match the output. This is a
-    # relative path from the build directory.
-    string(LENGTH "${CMAKE_BINARY_DIR}" root_dir_length)
-    math(EXPR root_dir_length "${root_dir_length} + 1")
-    string(SUBSTRING "${CMAKE_CURRENT_BINARY_DIR}" ${root_dir_length} -1 target)
-    set(target "${target}/${dest}")
-
-    set(depfile "${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} ${CMAKE_SOURCE_DIR}/go.mod
-                       DEPFILE ${depfile})
-  endif()
-endfunction()
-
 if(OPENSSL_NO_ASM)
   add_definitions(-DOPENSSL_NO_ASM)
 endif()