From eda228404ce9bd0ddfd1594b45836f19eea4a517 Mon Sep 17 00:00:00 2001
From: Michael Goderbauer <goderbauer@google.com>
Date: Wed, 26 Sep 2018 00:57:39 +0200
Subject: [PATCH] Strip debug symbols from App.framework for non-debug builds
 (#22245)

A dSYM file is created for the stripped `App.framework` and placed at `build/aot/App.dSYM`.

Reduces `App.framework` for Flutter Gallery by 6MB uncompressed, minus 23%.
Reduces `App.framework` for Hello World by 1.6MB uncompressed, minus 22%.

Fixes #4287.
Fixes #18693.
Helps with #21813.
See also #12012.

This change depends on https://dart-review.googlesource.com/c/sdk/+/76306.
---
 packages/flutter_tools/bin/xcode_backend.sh | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/packages/flutter_tools/bin/xcode_backend.sh b/packages/flutter_tools/bin/xcode_backend.sh
index 655040ab274..c8b61898390 100755
--- a/packages/flutter_tools/bin/xcode_backend.sh
+++ b/packages/flutter_tools/bin/xcode_backend.sh
@@ -141,7 +141,26 @@ BuildApp() {
     fi
     StreamOutput "done"
 
-    RunCommand cp -r -- "${build_dir}/aot/App.framework" "${derived_dir}"
+    local app_framework="${build_dir}/aot/App.framework"
+
+    RunCommand cp -r -- "${app_framework}" "${derived_dir}"
+
+    StreamOutput " ├─Generating dSYM file..."
+    RunCommand xcrun dsymutil -o "${build_dir}/aot/App.dSYM" "${app_framework}/App"
+    if [[ $? -ne 0 ]]; then
+      EchoError "Failed to generate debug symbols (dSYM) file for ${app_framework}/App."
+      exit -1
+    fi
+    StreamOutput "done"
+
+    StreamOutput " ├─Stripping debug symbols..."
+    RunCommand xcrun strip -x -S "${derived_dir}/App.framework/App"
+    if [[ $? -ne 0 ]]; then
+      EchoError "Failed to strip ${derived_dir}/App.framework/App."
+      exit -1
+    fi
+    StreamOutput "done"
+
   else
     RunCommand mkdir -p -- "${derived_dir}/App.framework"