gn build: Add support for building ubsan_minimal.

Differential Revision: https://reviews.llvm.org/D104754

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

@@ -8,6 +8,7 @@ group("lib") {
       "//compiler-rt/lib/asan",
       "//compiler-rt/lib/builtins",
       "//compiler-rt/lib/tsan",
+      "//compiler-rt/lib/ubsan_minimal",
     ]
   }
 }

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

@@ -0,0 +1,18 @@
+import("//compiler-rt/target.gni")
+
+source_set("sources") {
+  configs -= [ "//llvm/utils/gn/build:llvm_code" ]
+  configs += [ "//llvm/utils/gn/build:crt_code" ]
+}
+
+static_library("ubsan_minimal") {
+  output_dir = crt_current_out_dir
+  output_name = "clang_rt.ubsan_minimal$crt_current_target_suffix"
+  complete_static_lib = true
+  configs -= [
+    "//llvm/utils/gn/build:llvm_code",
+    "//llvm/utils/gn/build:thin_archive",
+  ]
+  configs += [ "//llvm/utils/gn/build:crt_code" ]
+  sources = [ "ubsan_minimal_handlers.cpp" ]
+}