From d0fed051738ab4cbab5f64fe6fae501229e87a83 Mon Sep 17 00:00:00 2001
From: Petr Hosek <phosek@chromium.org>
Date: Thu, 2 May 2019 17:29:39 +0000
Subject: [PATCH] [gn] Support for building libcxxabi

This change introduces support for building libcxxabi. The library
build should be complete, but not all CMake options have been
replicated in GN. We also don't support tests yet.

We only support two stage build at the moment.

Differential Revision: https://reviews.llvm.org/D60372

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@359805 91177308-0d34-0410-b5e6-96231b3b80d8
---
 utils/gn/secondary/BUILD.gn               |   1 +
 utils/gn/secondary/libcxxabi/BUILD.gn     |   5 +
 utils/gn/secondary/libcxxabi/src/BUILD.gn | 145 ++++++++++++++++++++++
 3 files changed, 151 insertions(+)
 create mode 100644 utils/gn/secondary/libcxxabi/BUILD.gn
 create mode 100644 utils/gn/secondary/libcxxabi/src/BUILD.gn

diff --git a/utils/gn/secondary/BUILD.gn b/utils/gn/secondary/BUILD.gn
index af0c85711c4..faefc371ffe 100644
--- a/utils/gn/secondary/BUILD.gn
+++ b/utils/gn/secondary/BUILD.gn
@@ -13,6 +13,7 @@ group("default") {
   if (current_os == "linux") {
     deps += [
       "//compiler-rt",
+      "//libcxxabi",
       "//libunwind",
     ]
   }
diff --git a/utils/gn/secondary/libcxxabi/BUILD.gn b/utils/gn/secondary/libcxxabi/BUILD.gn
new file mode 100644
index 00000000000..7f1e15fae96
--- /dev/null
+++ b/utils/gn/secondary/libcxxabi/BUILD.gn
@@ -0,0 +1,5 @@
+group("libcxxabi") {
+  deps = [
+    "//libcxxabi/src(//llvm/utils/gn/build/toolchain:stage2_unix)",
+  ]
+}
diff --git a/utils/gn/secondary/libcxxabi/src/BUILD.gn b/utils/gn/secondary/libcxxabi/src/BUILD.gn
new file mode 100644
index 00000000000..3175bef8063
--- /dev/null
+++ b/utils/gn/secondary/libcxxabi/src/BUILD.gn
@@ -0,0 +1,145 @@
+import("//clang/runtimes.gni")
+
+declare_args() {
+  # Use exceptions.
+  libcxxabi_enable_exceptions = true
+
+  # Build libc++abi with definitions for operator new/delete.
+  libcxxabi_enable_new_delete_definitions = true
+
+  # Build libcxxabi as a shared library.
+  libcxxabi_enable_shared = true
+
+  # Build libcxxabi as a static library.
+  libcxxabi_enable_static = true
+
+  # Do not export any symbols from the static library.
+  libcxxabi_hermetic_static_library = true
+}
+
+cxxabi_headers = [
+  # This comment prevents `gn format` from putting the file on the same line
+  # as `sources +=`, for sync_source_lists_from_cmake.py.
+  "../include/cxxabi.h",
+]
+
+cxxabi_sources = [
+  # C++ABI files
+  "cxa_aux_runtime.cpp",
+  "cxa_default_handlers.cpp",
+  "cxa_demangle.cpp",
+  "cxa_exception_storage.cpp",
+  "cxa_guard.cpp",
+  "cxa_handlers.cpp",
+  "cxa_unexpected.cpp",
+  "cxa_vector.cpp",
+  "cxa_virtual.cpp",
+
+  # C++ STL files
+  "stdlib_exception.cpp",
+  "stdlib_stdexcept.cpp",
+  "stdlib_typeinfo.cpp",
+
+  # Internal files
+  "abort_message.cpp",
+  "fallback_malloc.cpp",
+  "private_typeinfo.cpp",
+]
+if (libcxxabi_enable_new_delete_definitions) {
+  cxxabi_sources += [ "stdlib_new_delete.cpp" ]
+}
+if (libcxxabi_enable_exceptions) {
+  cxxabi_sources += [
+    "cxa_exception.cpp",
+    "cxa_personality.cpp",
+  ]
+} else {
+  cxxabi_sources += [
+    # This comment prevents `gn format` from putting the file on the same line
+    # as `sources +=`, for sync_source_lists_from_cmake.py.
+    "cxa_noexception.cpp",
+  ]
+}
+if (target_os == "linux" || target_os == "fuchsia") {
+  cxxabi_sources += [
+    # This comment prevents `gn format` from putting the file on the same line
+    # as `sources +=`, for sync_source_lists_from_cmake.py.
+    "cxa_thread_atexit.cpp"
+  ]
+}
+
+config("cxxabi_config") {
+  include_dirs = [
+    "//libcxxabi/include",
+    "//libcxx/include",
+  ]
+  cflags_cc = [ "-nostdinc++" ]
+  defines = [ "_LIBCXXABI_BUILDING_LIBRARY" ]
+  if (target_os == "win") {
+    defines += [ "_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS" ]
+  }
+}
+
+if (libcxxabi_enable_shared) {
+  shared_library("cxxabi_shared") {
+    output_dir = runtimes_dir
+    output_name = "c++abi"
+    if (target_os == "linux" || target_os == "mac") {
+      cflags = [ "-fPIC" ]
+      ldflags = [ "-nostdlib++" ]
+      libs = [
+        "dl",
+        "pthread",
+      ]
+    }
+    sources = cxxabi_sources
+    public = cxxabi_headers
+    deps = [
+      "//compiler-rt/lib/builtins",
+      "//libunwind/src:unwind_shared",
+    ]
+    configs += [ ":cxxabi_config" ]
+    configs -= [
+      "//llvm/utils/gn/build:no_exceptions",
+      "//llvm/utils/gn/build:no_rtti",
+    ]
+  }
+}
+
+if (libcxxabi_enable_static) {
+  static_library("cxxabi_static") {
+    output_dir = runtimes_dir
+    output_name = "c++abi"
+    complete_static_lib = true
+    configs -= [ "//llvm/utils/gn/build:thin_archive" ]
+    sources = cxxabi_sources
+    public = cxxabi_headers
+    if (libcxxabi_hermetic_static_library) {
+      cflags = [ "-fvisibility=hidden" ]
+      cflags_cc = [ "-fvisibility-global-new-delete-hidden" ]
+      defines = [
+        "_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS",
+        "_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS",
+      ]
+    }
+    deps = [
+      "//compiler-rt/lib/builtins",
+      "//libunwind/src:unwind_static",
+    ]
+    configs += [ ":cxxabi_config" ]
+    configs -= [
+      "//llvm/utils/gn/build:no_exceptions",
+      "//llvm/utils/gn/build:no_rtti",
+    ]
+  }
+}
+
+group("src") {
+  deps = []
+  if (libcxxabi_enable_shared) {
+    deps += [ ":cxxabi_shared" ]
+  }
+  if (libcxxabi_enable_static) {
+    deps += [ ":cxxabi_static" ]
+  }
+}
-- 
2.40.0