[gn] port ebb61a5 (llvm-cas)

Author: nico

llvm/utils/gn/secondary/llvm/test/BUILD.gn

@@ -195,6 +195,12 @@ write_lit_config("lit_site_cfg") {
     extra_values += [ "LLVM_ENABLE_LIBXML2=0" ]  # Must be 0.
   }
 
+  if (llvm_enable_ondisk_cas) {
+    extra_values += [ "LLVM_ENABLE_ONDISK_CAS=1" ]
+  } else {
+    extra_values += [ "LLVM_ENABLE_ONDISK_CAS=0" ]  # Must be 0.
+  }
+
   if (llvm_enable_expensive_checks) {
     extra_values += [ "LLVM_ENABLE_EXPENSIVE_CHECKS=1" ]
   } else {
@@ -265,6 +271,7 @@ group("test") {
     "//llvm/tools/llvm-as",
     "//llvm/tools/llvm-bcanalyzer",
     "//llvm/tools/llvm-c-test",
+    "//llvm/tools/llvm-cas",
     "//llvm/tools/llvm-cat",
     "//llvm/tools/llvm-cfi-verify",
     "//llvm/tools/llvm-cgdata",

llvm/utils/gn/secondary/llvm/tools/llvm-cas/BUILD.gn

@@ -0,0 +1,16 @@
+import("//llvm/utils/TableGen/tablegen.gni")
+
+tablegen("Options") {
+  visibility = [ ":llvm-cas" ]
+  args = [ "-gen-opt-parser-defs" ]
+}
+
+executable("llvm-cas") {
+  deps = [
+    ":Options",
+    "//llvm/lib/CAS",
+    "//llvm/lib/Option",
+    "//llvm/lib/Support",
+  ]
+  sources = [ "llvm-cas.cpp" ]
+}