Add multicall driver support for llvm-readtapi (#194763)

llvm/tools/llvm-readtapi/CMakeLists.txt

@@ -17,6 +17,7 @@ add_llvm_tool(llvm-readtapi
 
   DEPENDS
   ReadTAPIOptsTableGen
+  GENERATE_DRIVER
   )
 
 if(LLVM_INSTALL_BINUTILS_SYMLINKS)

llvm/tools/llvm-readtapi/llvm-readtapi.cpp

@@ -17,7 +17,7 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/FileSystem.h"
-#include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/raw_ostream.h"
@@ -487,8 +487,7 @@ static void setStubOptions(opt::InputArgList &Args, StubOptions &Opt) {
   Opt.TraceLibs = Args.hasArg(OPT_t);
 }
 
-int main(int Argc, char **Argv) {
-  InitLLVM X(Argc, Argv);
+int llvm_readtapi_main(int Argc, char **Argv, const llvm::ToolContext &) {
   BumpPtrAllocator A;
   StringSaver Saver(A);
   TAPIOptTable Tbl;

utils/bazel/llvm-project-overlay/llvm/BUILD.bazel

@@ -6842,15 +6842,13 @@ gentbl_cc_library(
     deps = [":OptParserTdFiles"],
 )
 
-cc_binary(
-    name = "llvm-readtapi",
-    testonly = True,
+cc_library(
+    name = "llvm-readtapi-lib",
     srcs = glob([
         "tools/llvm-readtapi/*.cpp",
         "tools/llvm-readtapi/*.h",
     ]),
     copts = llvm_copts,
-    stamp = 0,
     deps = [
         ":BinaryFormat",
         ":Object",
@@ -6862,6 +6860,13 @@ cc_binary(
     ],
 )
 
+llvm_driver_cc_binary(
+    name = "llvm-readtapi",
+    testonly = True,
+    stamp = 0,
+    deps = [":llvm-readtapi-lib"],
+)
+
 gentbl_cc_library(
     name = "TLICheckerOptsTableGen",
     strip_include_prefix = "tools/llvm-tli-checker",

utils/bazel/llvm-project-overlay/llvm/driver.bzl

@@ -30,6 +30,7 @@ _TOOLS = {
     "llvm-objdump": "//llvm:llvm-objdump-lib",
     "llvm-rc": "//llvm:llvm-rc-lib",
     "llvm-readobj": "//llvm:llvm-readobj-lib",
+    "llvm-readtapi": "//llvm:llvm-readtapi-lib",
     "llvm-size": "//llvm:llvm-size-lib",
     "llvm-symbolizer": "//llvm:llvm-symbolizer-lib",
     "sancov": "//llvm:sancov-lib",