From a18761ab9ef2ac81cb1597a387687faa1f254fa0 Mon Sep 17 00:00:00 2001
From: Peter Collingbourne <peter@pcc.me.uk>
Date: Fri, 1 Feb 2019 20:34:43 +0000
Subject: gn build: Create regular archives for the sanitizer runtimes.

We'll need to do this eventually if we create an installable package.
For now, this lets me use the archives to build Android, whose build
system wants to copy the archives to another location.

Differential Revision: https://reviews.llvm.org/D57607

llvm-svn: 352907
---
 llvm/utils/gn/build/BUILD.gn                            |  8 ++++++++
 llvm/utils/gn/build/BUILDCONFIG.gn                      |  1 +
 llvm/utils/gn/build/toolchain/BUILD.gn                  |  2 +-
 llvm/utils/gn/secondary/compiler-rt/lib/hwasan/BUILD.gn | 10 ++++++++--
 4 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/llvm/utils/gn/build/BUILD.gn b/llvm/utils/gn/build/BUILD.gn
index 4c5c3bbbb39..cd22d21bcb4 100644
--- a/llvm/utils/gn/build/BUILD.gn
+++ b/llvm/utils/gn/build/BUILD.gn
@@ -136,6 +136,14 @@ config("no_rtti") {
   }
 }
 
+# To make an archive that can be distributed, you need to remove this config and
+# set complete_static_lib.
+config("thin_archive") {
+  if (current_os != "win" && current_os != "mac") {
+    arflags = [ "-T" ]
+  }
+}
+
 config("llvm_code") {
   include_dirs = [
     "//llvm/include",
diff --git a/llvm/utils/gn/build/BUILDCONFIG.gn b/llvm/utils/gn/build/BUILDCONFIG.gn
index cec736fd8fa..7de638ff3df 100644
--- a/llvm/utils/gn/build/BUILDCONFIG.gn
+++ b/llvm/utils/gn/build/BUILDCONFIG.gn
@@ -6,6 +6,7 @@ shared_binary_target_configs = [
   "//llvm/utils/gn/build:compiler_defaults",
   "//llvm/utils/gn/build:llvm_code",
   "//llvm/utils/gn/build:no_rtti",
+  "//llvm/utils/gn/build:thin_archive",
   "//llvm/utils/gn/build:warn_covered_switch_default",
 ]
 
diff --git a/llvm/utils/gn/build/toolchain/BUILD.gn b/llvm/utils/gn/build/toolchain/BUILD.gn
index 4be5e4b8f31..5ba76d4ea55 100644
--- a/llvm/utils/gn/build/toolchain/BUILD.gn
+++ b/llvm/utils/gn/build/toolchain/BUILD.gn
@@ -50,7 +50,7 @@ template("unix_toolchain") {
         # Remove the output file first so that ar doesn't try to modify the
         # existing file.
         command =
-            "rm -f {{output}} && $ar rcsDT {{arflags}} {{output}} {{inputs}}"
+            "rm -f {{output}} && $ar rcsD {{arflags}} {{output}} {{inputs}}"
       }
       description = "AR {{output}}"
       outputs = [
diff --git a/llvm/utils/gn/secondary/compiler-rt/lib/hwasan/BUILD.gn b/llvm/utils/gn/secondary/compiler-rt/lib/hwasan/BUILD.gn
index 5979a6924ec..fe5870ad782 100644
--- a/llvm/utils/gn/secondary/compiler-rt/lib/hwasan/BUILD.gn
+++ b/llvm/utils/gn/secondary/compiler-rt/lib/hwasan/BUILD.gn
@@ -74,7 +74,10 @@ static_library("hwasan") {
   output_dir = crt_current_out_dir
   output_name = "clang_rt.hwasan-$crt_current_target"
   complete_static_lib = true
-  configs -= [ "//llvm/utils/gn/build:llvm_code" ]
+  configs -= [
+    "//llvm/utils/gn/build:llvm_code",
+    "//llvm/utils/gn/build:thin_archive",
+  ]
   configs += [ "//llvm/utils/gn/build:crt_code" ]
   deps = [
     ":sources",
@@ -85,7 +88,10 @@ static_library("hwasan_cxx") {
   output_dir = crt_current_out_dir
   output_name = "clang_rt.hwasan_cxx-$crt_current_target"
   complete_static_lib = true
-  configs -= [ "//llvm/utils/gn/build:llvm_code" ]
+  configs -= [
+    "//llvm/utils/gn/build:llvm_code",
+    "//llvm/utils/gn/build:thin_archive",
+  ]
   configs += [ "//llvm/utils/gn/build:crt_code" ]
   deps = [
     ":cxx_sources",
-- 
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