Merge #15208: Qt: remove macOS launch-at-startup when compiled with > macOS 10.11, fix memory missmanagement

da6011826a730837b59aef5664f3feab4787c9bc Fix macOS launch-at-startup memory issue (Jonas Schnelli)
516437a1b70b6df87faadfd38c3d84e6dfb5eae8 Qt: remove macOS launch-at-startup option when compiled with > macOS 10.11 (Jonas Schnelli)

Pull request description:

  The launch-at-startup API Bitcoin Core uses on macOS where removed in macOS 10.11 leading to a segmentation-fault due to the weak-linking when not actively compiled against SDK 10.11 (`-mmacosx-version-min=10.11`)

  This PR removes the launch-at-startup feature on macOS when compiled with macOS min version > 10.11 (the default is always the macOS version you compile on).

  **The depends built binaries (Gitian) are not affected since we are building with min macOS 10.10.**

  Users self compiling on macOS > 10.11 can re-enable the feature by compiling with min version <= 10.11 (`CXXFLAGS="-mmacosx-version-min=10.11" CFLAGS="-mmacosx-version-min=10.11" ./configure`)

  **Isn't there a new API from Apple?**
  Yes, [there is](https://developer.apple.com/library/archive/documentation/MacOSX/Conceptual/BPSystemStartup/Chapters/CreatingLoginItems.html).
  It will require to create a helper application which needs to be embedded in the .app folder (needs code signing as well). Developers willing to go down that rabbit hole are welcome.

  Fixes #15142

Tree-SHA512: fa9cc4e39d5a2d2559919b7e22b7766f5e0269a361719294d4a4a2df2fd9d955e5b23b5907e68023fdeee297f652f844f3c447904bf18f9c1145348ad101c432

3 files changed, 23 insertions, 11 deletions

diff --git a/doc/release-notes.md b/doc/release-notes.md
index 53b5a2119f..c21a153a25 100644
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -262,6 +262,12 @@ Graphical User Interface (GUI)
   balance shown if the wallet was created using the `createwallet` RPC
   and the `disable_private_keys` parameter was set to true.
 
+- The launch-on-startup option is no longer available on macOS if
+  compiled with macosx min version greater than 10.11 (use
+  CXXFLAGS="-mmacosx-version-min=10.11"
+  CFLAGS="-mmacosx-version-min=10.11" for setting the deployment
+  sdk version)
+
 Low-level changes
 =================
 
diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index b84c07d51a..71e987c8f4 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -683,13 +683,11 @@ bool SetStartOnSystemStartup(bool fAutoStart)
 }
 
 
-#elif defined(Q_OS_MAC)
+#elif defined(Q_OS_MAC) && defined(MAC_OS_X_VERSION_MIN_REQUIRED) && MAC_OS_X_VERSION_MIN_REQUIRED <= 101100
 // based on: https://github.com/Mozketo/LaunchAtLoginController/blob/master/LaunchAtLoginController.m
 
-LSSharedFileListItemRef findStartupItemInList(LSSharedFileListRef list, CFURLRef findUrl);
-LSSharedFileListItemRef findStartupItemInList(LSSharedFileListRef list, CFURLRef findUrl)
+LSSharedFileListItemRef findStartupItemInList(CFArrayRef listSnapshot, LSSharedFileListRef list, CFURLRef findUrl)
 {
-    CFArrayRef listSnapshot = LSSharedFileListCopySnapshot(list, nullptr);
     if (listSnapshot == nullptr) {
         return nullptr;
     }
@@ -714,15 +712,12 @@ LSSharedFileListItemRef findStartupItemInList(LSSharedFileListRef list, CFURLRef
         if(currentItemURL) {
             if (CFEqual(currentItemURL, findUrl)) {
                 // found
-                CFRelease(listSnapshot);
                 CFRelease(currentItemURL);
                 return item;
             }
             CFRelease(currentItemURL);
         }
     }
-
-    CFRelease(listSnapshot);
     return nullptr;
 }
 
@@ -734,10 +729,12 @@ bool GetStartOnSystemStartup()
     }
 
     LSSharedFileListRef loginItems = LSSharedFileListCreate(nullptr, kLSSharedFileListSessionLoginItems, nullptr);
-    LSSharedFileListItemRef foundItem = findStartupItemInList(loginItems, bitcoinAppUrl);
-
+    CFArrayRef listSnapshot = LSSharedFileListCopySnapshot(loginItems, nullptr);
+    bool res = (findStartupItemInList(listSnapshot, loginItems, bitcoinAppUrl) != nullptr);
     CFRelease(bitcoinAppUrl);
-    return !!foundItem; // return boolified object
+    CFRelease(loginItems);
+    CFRelease(listSnapshot);
+    return res;
 }
 
 bool SetStartOnSystemStartup(bool fAutoStart)
@@ -748,7 +745,8 @@ bool SetStartOnSystemStartup(bool fAutoStart)
     }
 
     LSSharedFileListRef loginItems = LSSharedFileListCreate(nullptr, kLSSharedFileListSessionLoginItems, nullptr);
-    LSSharedFileListItemRef foundItem = findStartupItemInList(loginItems, bitcoinAppUrl);
+    CFArrayRef listSnapshot = LSSharedFileListCopySnapshot(loginItems, nullptr);
+    LSSharedFileListItemRef foundItem = findStartupItemInList(listSnapshot, loginItems, bitcoinAppUrl);
 
     if(fAutoStart && !foundItem) {
         // add bitcoin app to startup item list
@@ -760,6 +758,8 @@ bool SetStartOnSystemStartup(bool fAutoStart)
     }
 
     CFRelease(bitcoinAppUrl);
+    CFRelease(loginItems);
+    CFRelease(listSnapshot);
     return true;
 }
 #pragma GCC diagnostic pop
diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index 27cec06d4b..849bc2e477 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -74,6 +74,12 @@ OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
 #ifdef Q_OS_MAC
     /* remove Window tab on Mac */
     ui->tabWidget->removeTab(ui->tabWidget->indexOf(ui->tabWindow));
+#if  defined(MAC_OS_X_VERSION_MIN_REQUIRED) && MAC_OS_X_VERSION_MIN_REQUIRED > 101100
+    /* hide launch at startup option if compiled against macOS > 10.11 (removed API) */
+    ui->bitcoinAtStartup->setVisible(false);
+    ui->verticalLayout_Main->removeWidget(ui->bitcoinAtStartup);
+    ui->verticalLayout_Main->removeItem(ui->horizontalSpacer_0_Main);
+#endif
 #endif
 
     /* remove Wallet tab in case of -disablewallet */