gn build: Add support for building with libcurl.

[thakis]

Lg

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

+import("//llvm/utils/gn/build/libs/curl/enable.gni")
+
+config("curl_config") {
+  visibility = [ ":curl" ]
+  libs = [ "curl" ]
+}
+
+group("curl") {
+  if (llvm_enable_libcurl) {
+    public_configs = [ ":curl_config" ]
+  }
+}

llvm/utils/gn/build/libs/curl/enable.gni

+declare_args() {
+  llvm_enable_libcurl = false
+}

llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn

 import("//llvm/lib/DebugInfo/PDB/enable_dia.gni")
 import("//llvm/lib/Target/targets.gni")
 import("//llvm/lib/Target/targets_with_asm_parsers.gni")
 import("//llvm/lib/Target/targets_with_disassemblers.gni")
 import("//llvm/lib/Target/targets_with_mcas.gni")
 import("//llvm/triples.gni")
 import("//llvm/utils/gn/build/buildflags.gni")
+import("//llvm/utils/gn/build/libs/curl/enable.gni")
 import("//llvm/utils/gn/build/libs/edit/enable.gni")
 import("//llvm/utils/gn/build/libs/pthread/enable.gni")
 import("//llvm/utils/gn/build/libs/terminfo/enable.gni")
 import("//llvm/utils/gn/build/libs/xar/enable.gni")
 import("//llvm/utils/gn/build/libs/xml/enable.gni")
 import("//llvm/utils/gn/build/libs/zlib/enable.gni")
 import("//llvm/utils/gn/build/write_cmake_config.gni")
 import("//llvm/version.gni")

 
 write_cmake_config("llvm-config") {
   input = "llvm-config.h.cmake"
   output = "$target_gen_dir/llvm-config.h"
   values = [
     "LLVM_BUILD_LLVM_DYLIB=",
     "LLVM_BUILD_SHARED_LIBS=",
     "LLVM_DEFAULT_TARGET_TRIPLE=$llvm_target_triple",
-    "LLVM_ENABLE_CURL=",
     "LLVM_ENABLE_DUMP=",
     "LLVM_ENABLE_NEW_PASS_MANAGER=1",
     "LLVM_FORCE_ENABLE_STATS=",
     "LLVM_FORCE_USE_OLD_TOOLCHAIN=",
     "LLVM_HAS_ATOMICS=1",
     "LLVM_HAVE_TF_API=",
     "LLVM_HOST_TRIPLE=$llvm_current_triple",
     "LLVM_NATIVE_ARCH=$native_target",
if (llvm_enable_threads) {
     values += [ "LLVM_ENABLE_THREADS=" ]
   }
 
   if (llvm_enable_zlib) {
     values += [ "LLVM_ENABLE_ZLIB=1" ]
   } else {
     values += [ "LLVM_ENABLE_ZLIB=" ]
   }
+
+  if (llvm_enable_libcurl) {
+    values += [ "LLVM_ENABLE_CURL=1" ]
+  } else {
+    values += [ "LLVM_ENABLE_CURL=" ]
+  }
 }
 
 ##############################################################################
 # .def files used by llvm/lib/Target
 
 template("write_target_def_file") {
   assert(defined(invoker.key), "must set 'key' in $target_name")
   assert(defined(invoker.value), "must set 'value' in $target_name")

llvm/utils/gn/secondary/llvm/lib/Debuginfod/BUILD.gn

 static_library("Debuginfod") {
   output_name = "LLVMDebuginfod"
-  deps = [ "//llvm/lib/Support" ]
+  deps = [
+    "//llvm/lib/Support",
+    "//llvm/utils/gn/build/libs/curl",
+  ]
   sources = [
     "DIFetcher.cpp",
     "Debuginfod.cpp",
     "HTTPClient.cpp",
   ]
 }

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

 import("//llvm/lib/DebugInfo/PDB/enable_dia.gni")
 import("//llvm/lib/Target/targets_string.gni")
 import("//llvm/triples.gni")
 import("//llvm/utils/gn/build/buildflags.gni")
+import("//llvm/utils/gn/build/libs/curl/enable.gni")
 import("//llvm/utils/gn/build/libs/pthread/enable.gni")
 import("//llvm/utils/gn/build/libs/xar/enable.gni")
 import("//llvm/utils/gn/build/libs/xml/enable.gni")
 import("//llvm/utils/gn/build/libs/zlib/enable.gni")
 import("//llvm/utils/gn/build/mac_sdk.gni")
 import("//llvm/utils/gn/build/write_cmake_config.gni")
 import("//llvm/utils/llvm-lit/lit_path_function.gni")
 import("//llvm/version.gni")
extra_values = [
     # LLVM_USE_SANITIZER.  (See also CMAKE_CXX_COMPILER in clang/test/BUILD.gn.)
     "HOST_CXX=c++",
 
     # Only used by the Go bindings tests, and for detecting a 32-bit build
     # and in a belt-and-suspenders check for detecting 32-bit host builds.
     # (That check also checks LLVM_HOST_TRIPLE.)
     "HOST_LDFLAGS=",
 
-    "LLVM_ENABLE_CURL=0",
     "LLVM_ENABLE_FFI=0",
     "LLVM_HAVE_OPT_VIEWER_MODULES=0",
     "LLVM_HOST_TRIPLE=$llvm_current_triple",
     "LLVM_LIBS_DIR=" + rebase_path("$root_out_dir/lib", dir),
     "LLVM_LINK_LLVM_DYLIB=0",
     "LLVM_LIT_TOOLS_DIR=",  # Intentionally empty, matches cmake build.
     "LLVM_NATIVE_ARCH=$native_target",
     "LLVM_USE_INTEL_JITEVENTS=0",
if (llvm_enable_threads) {
     extra_values += [ "LLVM_ENABLE_THREADS=0" ]  # Must be 0.
   }
 
   if (llvm_enable_zlib) {
     extra_values += [ "LLVM_ENABLE_ZLIB=1" ]
   } else {
     extra_values += [ "LLVM_ENABLE_ZLIB=0" ]  # Must be 0.
   }
+
+  if (llvm_enable_libcurl) {
+    extra_values += [ "LLVM_ENABLE_CURL=1" ]
+  } else {
+    extra_values += [ "LLVM_ENABLE_CURL=0" ]  # Must be 0.
+  }
 }
 
 write_lit_config("lit_unit_site_cfg") {
   input = "//llvm/test/Unit/lit.site.cfg.py.in"
   output = llvm_lit_unit_site_cfg_file
   extra_values = [ "LLVM_BUILD_MODE=." ]
 }