gn build: Add some build files for clangd

[thakis]

Summary

Enough to build the clangd binaries, but this is still missing build
files for:

• fuzzer
• indexer
• index/dex/dexp
• benchmarks
• xpc

[mbonadei]

Sorry for the delay, LGTM % 2 small comments.

llvm/utils/gn/secondary/clang-tools-extra/clang-apply-replacements/BUILD.gn

2

Oh, I forgot to add this! Thanks!

llvm/utils/gn/secondary/clang-tools-extra/clangd/BUILD.gn

32

Missing //clang/lib/Tooling ?

llvm/utils/gn/secondary/clang-tools-extra/clangd/refactor/tweaks/BUILD.gn

7

Missing "//llvm/lib/Support"?

Probably it is ok, since it is a source_set, but am I following the 1:1 matching rule.

llvm/utils/gn/secondary/clang-tools-extra/clangd/tool/BUILD.gn

9

+1, if that is not possible this target should be in clangd/BUILD.gn (it is more natural).

[thakis]

Thanks! Landing with comments addressed.

clang-tools-extra/clangd/refactor/tweaks/CMakeLists.txt

 include_directories(${CMAKE_CURRENT_SOURCE_DIR}/../..)
 
 set(LLVM_LINK_COMPONENTS
   support
   )
 
 # A target containing all code tweaks (i.e. mini-refactorings) provided by
 # clangd.
-# Built as an object library to make sure linker does not remove global
+# Built as an object library to make sure the linker does not remove global
 # constructors that register individual tweaks in a global registry.
-# To enable these tweaks in exectubales or shared libraries, add
+# To enable these tweaks in executables or shared libraries, add
 # $<TARGET_OBJECTS:obj.clangDaemonTweaks> to a list of sources, see
 # clangd/tool/CMakeLists.txt for an example.
 add_clang_library(clangDaemonTweaks OBJECT
   SwapIfBranches.cpp
 
   LINK_LIBS
   clangAST
   clangDaemon
   clangToolingCore
   )

llvm/utils/gn/build/libs/atomic/BUILD.gn

+config("atomic_config") {
+  visibility = [ ":atomic" ]
+  libs = [ "atomic" ]
+}
+
+group("atomic") {
+  # Needed on platforms that have no native support for 64-bit atomics.
+  # FIXME: Check if is right; certainly needs to be false on macOS and Windows.
+  needs_explicit_lib_atomic =
+      current_os != "mac" && current_os != "win" && current_cpu == "mipsel"
+  if (needs_explicit_lib_atomic) {
+    public_configs = [ ":atomic_config" ]
+  }
+}

llvm/utils/gn/secondary/BUILD.gn

 import("//clang/lib/ARCMigrate/enable.gni")
 import("//clang/lib/StaticAnalyzer/Frontend/enable.gni")
 import("//llvm/utils/gn/build/toolchain/compiler.gni")
 
 group("default") {
   deps = [
     "//clang-tools-extra/clang-apply-replacements/tool:clang-apply-replacements",
     "//clang-tools-extra/clang-change-namespace/tool:clang-change-namespace",
     "//clang-tools-extra/clang-doc/tool:clang-doc",
     "//clang-tools-extra/clang-include-fixer/find-all-symbols/tool:find-all-symbols",
     "//clang-tools-extra/clang-include-fixer/tool:clang-include-fixer",
     "//clang-tools-extra/clang-move/tool:clang-move",
     "//clang-tools-extra/clang-query/tool:clang-query",
     "//clang-tools-extra/clang-reorder-fields/tool:clang-reorder-fields",
     "//clang-tools-extra/clang-tidy/tool:clang-tidy",
+    "//clang-tools-extra/clangd/tool:clangd",
     "//clang-tools-extra/modularize",
     "//clang-tools-extra/pp-trace",
     "//clang/test",
     "//lld/test",
     "//llvm/test",
   ]
   if (current_os == "linux" || current_os == "android") {
     deps += [ "//compiler-rt/test/hwasan" ]

llvm/utils/gn/secondary/clang-tools-extra/clang-apply-replacements/BUILD.gn

 static_library("clang-apply-replacements") {
+  output_name = "clangApplyReplacements"
   configs += [ "//llvm/utils/gn/build:clang_code" ]
   deps = [
     "//clang/lib/AST",
     "//clang/lib/Basic",
     "//clang/lib/Rewrite",
     "//clang/lib/Tooling/Core",
     "//clang/lib/Tooling/Refactoring",
     "//llvm/lib/Support",
   ]
   include_dirs = [ "include" ]
   sources = [
     "lib/Tooling/ApplyReplacements.cpp",
   ]
 }

llvm/utils/gn/secondary/clang-tools-extra/clangd/BUILD.gn

+static_library("clangd") {
+  output_name = "clangDaemon"
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang-tools-extra/clang-tidy/abseil",
+    "//clang-tools-extra/clang-tidy/android",
+    "//clang-tools-extra/clang-tidy/boost",
+    "//clang-tools-extra/clang-tidy/bugprone",
+    "//clang-tools-extra/clang-tidy/cert",
+    "//clang-tools-extra/clang-tidy/cppcoreguidelines",
+    "//clang-tools-extra/clang-tidy/fuchsia",
+    "//clang-tools-extra/clang-tidy/google",
+    "//clang-tools-extra/clang-tidy/hicpp",
+    "//clang-tools-extra/clang-tidy/llvm",
+    "//clang-tools-extra/clang-tidy/misc",
+    "//clang-tools-extra/clang-tidy/modernize",
+    "//clang-tools-extra/clang-tidy/objc",
+    "//clang-tools-extra/clang-tidy/performance",
+    "//clang-tools-extra/clang-tidy/portability",
+    "//clang-tools-extra/clang-tidy/readability",
+    "//clang-tools-extra/clang-tidy/zircon",
+    "//clang/lib/AST",
+    "//clang/lib/ASTMatchers",
+    "//clang/lib/Basic",
+    "//clang/lib/Driver",
+    "//clang/lib/Format",
+    "//clang/lib/Frontend",
+    "//clang/lib/Index",
+    "//clang/lib/Lex",
+    "//clang/lib/Sema",
+    "//clang/lib/Serialization",
+    "//clang/lib/Tooling/Core",
+    "//clang/lib/Tooling/Inclusions",
+    "//clang/lib/Tooling/Refactoring",
+    "//llvm/lib/Support",
+    "//llvm/utils/gn/build/libs/atomic",
+    "//llvm/utils/gn/build/libs/pthread",
+  ]
+  include_dirs = [ "." ]
+  sources = [
+    "AST.cpp",
+    "Cancellation.cpp",
+    "ClangdLSPServer.cpp",
+    "ClangdServer.cpp",
+    "ClangdUnit.cpp",
+    "CodeComplete.cpp",
+    "CodeCompletionStrings.cpp",
+    "Compiler.cpp",
+    "Context.cpp",
+    "Diagnostics.cpp",
+    "DraftStore.cpp",
+    "ExpectedTypes.cpp",
+    "FS.cpp",
+    "FSProvider.cpp",
+    "FileDistance.cpp",
+    "FindSymbols.cpp",
+    "FuzzyMatch.cpp",
+    "GlobalCompilationDatabase.cpp",
+    "Headers.cpp",
+    "IncludeFixer.cpp",
+    "JSONTransport.cpp",
+    "Logger.cpp",
+    "Protocol.cpp",
+    "Quality.cpp",
+    "RIFF.cpp",
+    "Selection.cpp",
+    "SourceCode.cpp",
+    "TUScheduler.cpp",
+    "Threading.cpp",
+    "Trace.cpp",
+    "URI.cpp",
+    "XRefs.cpp",
+    "index/Background.cpp",
+    "index/BackgroundIndexStorage.cpp",
+    "index/CanonicalIncludes.cpp",
+    "index/FileIndex.cpp",
+    "index/Index.cpp",
+    "index/IndexAction.cpp",
+    "index/MemIndex.cpp",
+    "index/Merge.cpp",
+    "index/Ref.cpp",
+    "index/Serialization.cpp",
+    "index/Symbol.cpp",
+    "index/SymbolCollector.cpp",
+    "index/SymbolID.cpp",
+    "index/SymbolLocation.cpp",
+    "index/SymbolOrigin.cpp",
+    "index/YAMLSerialization.cpp",
+    "index/dex/Dex.cpp",
+    "index/dex/Iterator.cpp",
+    "index/dex/PostingList.cpp",
+    "index/dex/Trigram.cpp",
+    "refactor/Tweak.cpp",
+  ]
+}

llvm/utils/gn/secondary/clang-tools-extra/clangd/refactor/tweaks/BUILD.gn

+# A target containing all code tweaks (i.e. mini-refactorings) provided by
+# clangd.
+# Built as a source_set to make sure the linker does not remove global
+# constructors that register individual tweaks in a global registry.
+source_set("tweaks") {
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang-tools-extra/clangd",
+    "//clang/lib/AST",
+    "//clang/lib/Tooling/Core",
+  ]
+  include_dirs = [ "../.." ]
+  sources = [
+    "SwapIfBranches.cpp",
+  ]
+}

llvm/utils/gn/secondary/clang-tools-extra/clangd/tool/BUILD.gn

+import("//llvm/utils/gn/build/write_cmake_config.gni")
+
+declare_args() {
+  # Whether to build clangd's XPC components.
+  clangd_build_xpc = false
+}
+
+write_cmake_config("features") {
+  # FIXME: Try moving Features.inc.in to tools, seems like a better location.
+  input = "../Features.inc.in"
+  output = "$target_gen_dir/Features.inc"
+  values = []
+  if (clangd_build_xpc) {
+    values += [ "CLANGD_BUILD_XPC=1" ]
+  } else {
+    values += [ "CLANGD_BUILD_XPC=0" ]
+  }
+}
+
+executable("clangd") {
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    ":features",
+    "//clang-tools-extra/clang-tidy",
+    "//clang-tools-extra/clangd",
+    "//clang-tools-extra/clangd/refactor/tweaks",
+    "//clang/lib/AST",
+    "//clang/lib/Basic",
+    "//clang/lib/Format",
+    "//clang/lib/Frontend",
+    "//clang/lib/Sema",
+    "//clang/lib/Tooling",
+    "//clang/lib/Tooling/Core",
+    "//llvm/lib/Support",
+  ]
+
+  include_dirs = [
+    "..",
+
+    # To pick up the generated inc files.
+    "$target_gen_dir",
+  ]
+  sources = [
+    "ClangdMain.cpp",
+  ]
+
+  if (clangd_build_xpc) {
+    # FIXME: Depend on clangdXpcJsonConversions, clangdXpcTransport
+  }
+}