third_party/brotli: Split out the encoder target in BUILD.gn.

Bug: 907489
Change-Id: Ia66d652b30fbaba67035e042a2144adc3727c582
Reviewed-on: https://chromium-review.googlesource.com/c/1347282
Commit-Queue: Benoit L <lizeb@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611121}

third_party/brotli/BUILD.gn

@@ -60,6 +60,69 @@ dec_sources = [
   "dec/state.h",
 ]
 
+enc_sources = [
+  "enc/backward_references.c",
+  "enc/backward_references.h",
+  "enc/backward_references_hq.c",
+  "enc/backward_references_hq.h",
+  "enc/backward_references_inc.h",
+  "enc/bit_cost.c",
+  "enc/bit_cost.h",
+  "enc/bit_cost_inc.h",
+  "enc/block_encoder_inc.h",
+  "enc/block_splitter.c",
+  "enc/block_splitter.h",
+  "enc/block_splitter_inc.h",
+  "enc/brotli_bit_stream.c",
+  "enc/brotli_bit_stream.h",
+  "enc/cluster.c",
+  "enc/cluster.h",
+  "enc/cluster_inc.h",
+  "enc/command.h",
+  "enc/compress_fragment.c",
+  "enc/compress_fragment.h",
+  "enc/compress_fragment_two_pass.c",
+  "enc/compress_fragment_two_pass.h",
+  "enc/dictionary_hash.c",
+  "enc/dictionary_hash.h",
+  "enc/encode.c",
+  "enc/encoder_dict.c",
+  "enc/encoder_dict.h",
+  "enc/entropy_encode.c",
+  "enc/entropy_encode.h",
+  "enc/entropy_encode_static.h",
+  "enc/fast_log.h",
+  "enc/find_match_length.h",
+  "enc/hash.h",
+  "enc/hash_composite_inc.h",
+  "enc/hash_forgetful_chain_inc.h",
+  "enc/hash_longest_match64_inc.h",
+  "enc/hash_longest_match_inc.h",
+  "enc/hash_longest_match_quickly_inc.h",
+  "enc/hash_rolling_inc.h",
+  "enc/hash_to_binary_tree_inc.h",
+  "enc/histogram.c",
+  "enc/histogram.h",
+  "enc/histogram_inc.h",
+  "enc/literal_cost.c",
+  "enc/literal_cost.h",
+  "enc/memory.c",
+  "enc/memory.h",
+  "enc/metablock.c",
+  "enc/metablock.h",
+  "enc/metablock_inc.h",
+  "enc/params.h",
+  "enc/prefix.h",
+  "enc/quality.h",
+  "enc/ringbuffer.h",
+  "enc/static_dict.c",
+  "enc/static_dict.h",
+  "enc/static_dict_lut.h",
+  "enc/utf8_util.c",
+  "enc/utf8_util.h",
+  "enc/write_bits.h",
+]
+
 static_library("dec") {
   sources = dec_sources
   public_configs = [ ":includes" ]
@@ -96,69 +159,28 @@ static_library("dec_no_dictionary_data") {
   configs += [ "//build/config/compiler:optimize_max" ]
 }
 
+static_library("enc") {
+  sources = enc_sources
+  public_configs = [ ":includes" ]
+
+  public_deps = [
+    ":headers",
+  ]
+  deps = [
+    ":common",
+  ]
+
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+
+  # Since we never debug brotli, freeze the optimizations to -O2.
+  configs -= [ "//build/config/compiler:default_optimization" ]
+  configs += [ "//build/config/compiler:optimize_max" ]
+}
+
 if (current_toolchain == host_toolchain) {
   executable("brotli") {
     sources = [
-      "enc/backward_references.c",
-      "enc/backward_references.h",
-      "enc/backward_references_hq.c",
-      "enc/backward_references_hq.h",
-      "enc/backward_references_inc.h",
-      "enc/bit_cost.c",
-      "enc/bit_cost.h",
-      "enc/bit_cost_inc.h",
-      "enc/block_encoder_inc.h",
-      "enc/block_splitter.c",
-      "enc/block_splitter.h",
-      "enc/block_splitter_inc.h",
-      "enc/brotli_bit_stream.c",
-      "enc/brotli_bit_stream.h",
-      "enc/cluster.c",
-      "enc/cluster.h",
-      "enc/cluster_inc.h",
-      "enc/command.h",
-      "enc/compress_fragment.c",
-      "enc/compress_fragment.h",
-      "enc/compress_fragment_two_pass.c",
-      "enc/compress_fragment_two_pass.h",
-      "enc/dictionary_hash.c",
-      "enc/dictionary_hash.h",
-      "enc/encode.c",
-      "enc/encoder_dict.c",
-      "enc/encoder_dict.h",
-      "enc/entropy_encode.c",
-      "enc/entropy_encode.h",
-      "enc/entropy_encode_static.h",
-      "enc/fast_log.h",
-      "enc/find_match_length.h",
-      "enc/hash.h",
-      "enc/hash_composite_inc.h",
-      "enc/hash_forgetful_chain_inc.h",
-      "enc/hash_longest_match64_inc.h",
-      "enc/hash_longest_match_inc.h",
-      "enc/hash_longest_match_quickly_inc.h",
-      "enc/hash_rolling_inc.h",
-      "enc/hash_to_binary_tree_inc.h",
-      "enc/histogram.c",
-      "enc/histogram.h",
-      "enc/histogram_inc.h",
-      "enc/literal_cost.c",
-      "enc/literal_cost.h",
-      "enc/memory.c",
-      "enc/memory.h",
-      "enc/metablock.c",
-      "enc/metablock.h",
-      "enc/metablock_inc.h",
-      "enc/params.h",
-      "enc/prefix.h",
-      "enc/quality.h",
-      "enc/ringbuffer.h",
-      "enc/static_dict.c",
-      "enc/static_dict.h",
-      "enc/static_dict_lut.h",
-      "enc/utf8_util.c",
-      "enc/utf8_util.h",
-      "enc/write_bits.h",
       "tools/brotli.c",
     ]
     public_configs = [ ":includes" ]
@@ -166,6 +188,7 @@ if (current_toolchain == host_toolchain) {
     deps = [
       ":common",
       ":dec",
+      ":enc",
       ":headers",
       "//build/win:default_exe_manifest",
     ]