[gn build] Add ubsan libraries

[aeubanks]

Summary

clang -fsanitize=undefined works with this.

[thakis]

Maybe say "for Linux and Android" in commit message somewhere.

Thanks!

[thakis]

Please watch http://45.33.8.238/ after landing gn changes.

(Fixed this one in f56e486fdc1deb99148d88d21af6f3c7756029ef)

[thakis]

Also broke mac: http://45.33.8.238/macm1/42512/step_4.txt

[aeubanks]

sorry about that, will try to remember in the future
looking at the mac breakage

[aeubanks]

oh I see your https://github.com/llvm/llvm-project/commit/73f0ca806e66406cbd34006959b203628209cd72

llvm/utils/gn/secondary/compiler-rt/lib/BUILD.gn

 group("lib") {
   deps = [
     "//compiler-rt/lib/asan:ignorelist($host_toolchain)",
     "//compiler-rt/lib/cfi:ignorelist($host_toolchain)",
   ]
   if (current_os == "linux") {
     deps += [ "//compiler-rt/lib/msan" ]
   }
   if (current_os == "linux" || current_os == "android") {
-    deps += [ "//compiler-rt/lib/ubsan_minimal" ]
+    deps += [
+      "//compiler-rt/lib/ubsan",
+      "//compiler-rt/lib/ubsan_minimal",
+    ]
   }
   if (current_os != "win" && current_os != "baremetal") {
     deps += [ "//compiler-rt/lib/asan" ]
     if (current_cpu == "x64" || current_cpu == "arm64") {
       deps += [ "//compiler-rt/lib/tsan/rtl" ]
     }
   }
   if (current_os != "win") {
     deps += [ "//compiler-rt/lib/builtins" ]
   }
   if (current_os != "baremetal") {
     deps += [ "//compiler-rt/lib/profile" ]
   }
 }

llvm/utils/gn/secondary/compiler-rt/lib/ubsan/BUILD.gn

+import("//compiler-rt/target.gni")
+
+group("ubsan") {
+  deps = [
+    ":ubsan_standalone",
+    ":ubsan_standalone_cxx",
+  ]
+}
+
 source_set("sources") {
   configs -= [ "//llvm/utils/gn/build:llvm_code" ]
   configs += [ "//llvm/utils/gn/build:crt_code" ]
   defines = [ "UBSAN_CAN_USE_CXXABI" ]
   deps = [
     "//compiler-rt/lib/interception:sources",
     "//compiler-rt/lib/sanitizer_common:sources",
   ]

 
 source_set("dynamic_runtime_thunk") {
   configs -= [ "//llvm/utils/gn/build:llvm_code" ]
   configs += [ "//llvm/utils/gn/build:crt_code" ]
   defines = [ "SANITIZER_DYNAMIC_RUNTIME_THUNK" ]
   sources = [ "ubsan_win_dynamic_runtime_thunk.cpp" ]
 }
 
-# Unreferenced; at the moment exists to make sync_source_lists_from_cmake happy.
 source_set("standalone_sources") {
   configs -= [ "//llvm/utils/gn/build:llvm_code" ]
   configs -= [ "//llvm/utils/gn/build:no_rtti" ]
   configs += [ "//llvm/utils/gn/build:crt_code" ]
   defines = [ "UBSAN_CAN_USE_CXXABI" ]
   sources = [
     "ubsan_diag_standalone.cpp",
     "ubsan_init_standalone.cpp",
     "ubsan_signals_standalone.cpp",
   ]
+  deps = [
+    ":sources",
+    "//compiler-rt/lib/interception:sources",
+    "//compiler-rt/lib/sanitizer_common:sources",
+  ]
 }
 
 source_set("cxx_sources") {
   configs -= [ "//llvm/utils/gn/build:llvm_code" ]
   configs -= [ "//llvm/utils/gn/build:no_rtti" ]
   configs += [ "//llvm/utils/gn/build:crt_code" ]
   defines = [ "UBSAN_CAN_USE_CXXABI" ]
   sources = [
     "ubsan_handlers_cxx.cpp",
     "ubsan_handlers_cxx.h",
     "ubsan_type_hash.cpp",
     "ubsan_type_hash_itanium.cpp",
     "ubsan_type_hash_win.cpp",
   ]
 }
+
+static_library("ubsan_standalone") {
+  output_dir = crt_current_out_dir
+  output_name = "clang_rt.ubsan_standalone$crt_current_target_suffix"
+  complete_static_lib = true
+  configs -= [
+    "//llvm/utils/gn/build:llvm_code",
+    "//llvm/utils/gn/build:thin_archive",
+  ]
+  deps = [
+    ":sources",
+    ":standalone_sources",
+  ]
+  configs += [ "//llvm/utils/gn/build:crt_code" ]
+  sources = [ "ubsan_init_standalone_preinit.cpp" ]
+}
+
+static_library("ubsan_standalone_cxx") {
+  output_dir = crt_current_out_dir
+  output_name = "clang_rt.ubsan_standalone_cxx$crt_current_target_suffix"
+  complete_static_lib = true
+  configs -= [
+    "//llvm/utils/gn/build:llvm_code",
+    "//llvm/utils/gn/build:thin_archive",
+  ]
+  deps = [ ":cxx_sources" ]
+  configs += [ "//llvm/utils/gn/build:crt_code" ]
+}