From 6c5359d23be54d51882305b6c1e3b107b526d699 Mon Sep 17 00:00:00 2001
From: Kylmakalle <iceman9831@gmail.com>
Date: Mon, 19 May 2025 23:42:53 +0300
Subject: [PATCH] Fix iOS 13-14 concurrency backport

---
 Swiftgram/FixConcurrencyBackport/BUILD | 37 ++++++++++++++++++++++++++
 Telegram/BUILD                         |  9 ++++++-
 Telegram/PatchMinOSVersion.source.sh   |  8 ++++++
 3 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 Swiftgram/FixConcurrencyBackport/BUILD

diff --git a/Swiftgram/FixConcurrencyBackport/BUILD b/Swiftgram/FixConcurrencyBackport/BUILD
new file mode 100644
index 0000000000..d910f483e6
--- /dev/null
+++ b/Swiftgram/FixConcurrencyBackport/BUILD
@@ -0,0 +1,37 @@
+# Something changed in Telegram versions 11.8.1 -> 11.10
+# https://github.com/TelegramMessenger/Telegram-iOS/compare/release-11.8.1...TelegramMessenger:Telegram-iOS:release-11.10
+#
+# Since then, all binaries and libs are linked to the /usr/lib/swift/libswift_Concurrency.dylib instead of expected @rpath/libswift_Concurrency.dylib,
+# this makes swift-stdlib-tool to ignore libswift_Concurrency.dylib and not copy it to the app bundle.
+# This causes crash on every system that expects this backport (iOS 14 and below).
+# This script will remap the path to @rpath/libswift_Concurrency.dylib in all binaries of the App, it's only needed for iphoneos target in this project.
+# This is a temporary fix until minimum OS version will be bumped to iOS 15+ or Xcode version changed to 16.3 (with Swift 6.1 support)
+
+# find "$1" -type f \( -perm +111 -o -name "*.dylib" \) | while read -r bin; do
+#   if otool -L "$bin" | grep -q "/usr/lib/swift/libswift_Concurrency.dylib"; then
+#     echo "Patching concurrency backport in: $bin"
+#     install_name_tool -change /usr/lib/swift/libswift_Concurrency.dylib @rpath/libswift_Concurrency.dylib "$bin"
+#   fi
+# done
+
+# Refs:
+# https://stackoverflow.com/questions/79522371/when-building-the-project-with-xcode-16-2-the-app-crashes-due-to-an-incorrect-l
+# https://github.com/swiftlang/swift/issues/74303
+# https://github.com/bazelbuild/rules_apple/pull/1393
+
+genrule(
+    name = "CopyConcurrencyDylib",
+    cmd_bash =
+"""
+    echo 'ditto "$$(xcode-select -p)/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift-5.5/iphoneos/libswift_Concurrency.dylib" "$$1/Payload/Swiftgram.app/Frameworks/libswift_Concurrency.dylib"' > $(location CopyConcurrencyDylib.sh)
+    echo 'ditto "$$1/Payload/Swiftgram.app/Frameworks/libswift_Concurrency.dylib" "$$1/SwiftSupport/iphoneos/libswift_Concurrency.dylib"' >> $(location CopyConcurrencyDylib.sh)
+    echo '' >> $(location CopyConcurrencyDylib.sh)
+""",
+    outs = [
+        "CopyConcurrencyDylib.sh",
+    ],
+    executable = True,
+    visibility = [
+        "//visibility:public",
+    ]
+)
\ No newline at end of file
diff --git a/Telegram/BUILD b/Telegram/BUILD
index 3ca93f37ef..e434e44725 100644
--- a/Telegram/BUILD
+++ b/Telegram/BUILD
@@ -1001,6 +1001,13 @@ genrule(
     cmd_bash =
 """
     echo 'for f in $$1/*.framework; do binary_name=`echo $$(basename $$f) | sed -e "s/\\\\.framework//"`; strip -ST $$f/$$binary_name; done;' > $(location StripFramework.sh)
+    # MARK: Swiftgram
+    echo 'find "$$1" -type f \\( -perm +111 -o -name "*.dylib" \\) | while read -r bin; do \
+        if otool -L "$$bin" | grep -q "/usr/lib/swift/libswift_Concurrency.dylib"; then \
+            echo "Patching concurrency backport in: $$bin"; \
+            install_name_tool -change /usr/lib/swift/libswift_Concurrency.dylib @rpath/libswift_Concurrency.dylib "$$bin"; \
+        fi; \
+    done;' >> $(location StripFramework.sh)
     echo '' >> $(location StripFramework.sh)
 """,
     outs = [
@@ -2038,7 +2045,7 @@ ios_application(
     alternate_icons = [
         ":{}".format(name) for name in alternate_icon_folders
     ],
-    #ipa_post_processor = ":AddAlternateIcons",
+    ipa_post_processor = "//Swiftgram/FixConcurrencyBackport:CopyConcurrencyDylib",
     resources = [
         ":LaunchScreen",
         ":DefaultAppIcon",
diff --git a/Telegram/PatchMinOSVersion.source.sh b/Telegram/PatchMinOSVersion.source.sh
index dd0607c784..565529e0ef 100644
--- a/Telegram/PatchMinOSVersion.source.sh
+++ b/Telegram/PatchMinOSVersion.source.sh
@@ -13,3 +13,11 @@ if [ "$version" == "14.0" ]; then
 	binary_path="$f/$(basename $f | sed -e s/\.appex//g)"
 	xcrun lipo "$binary_path" -remove armv7 -o "$binary_path" 2>/dev/null || true
 fi
+
+# MARK: Swiftgram
+find "$1" -type f \( -perm +111 -o -name "*.dylib" \) | while read -r bin; do
+  if otool -L "$bin" | grep -q "/usr/lib/swift/libswift_Concurrency.dylib"; then
+    echo "Patching concurrency backport in: $bin"
+    install_name_tool -change /usr/lib/swift/libswift_Concurrency.dylib @rpath/libswift_Concurrency.dylib "$bin"
+  fi
+done
\ No newline at end of file