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-rw-r--r--pkgs/development/libraries/qt-5/5.15/default.nix6
-rw-r--r--pkgs/development/libraries/qt-5/5.15/qtdeclarative-default-disable-qmlcache.patch13
2 files changed, 18 insertions, 1 deletions
diff --git a/pkgs/development/libraries/qt-5/5.15/default.nix b/pkgs/development/libraries/qt-5/5.15/default.nix
index e3f94ba8ffefc..616bf22ff13a9 100644
--- a/pkgs/development/libraries/qt-5/5.15/default.nix
+++ b/pkgs/development/libraries/qt-5/5.15/default.nix
@@ -56,7 +56,11 @@ let
       ./qtbase.patch.d/0010-qtbase-assert.patch
       ./qtbase.patch.d/0011-fix-header_module.patch
     ];
-    qtdeclarative = [ ./qtdeclarative.patch ];
+    qtdeclarative = [
+      ./qtdeclarative.patch
+      # prevent headaches from stale qmlcache data
+      ./qtdeclarative-default-disable-qmlcache.patch
+    ];
     qtscript = [ ./qtscript.patch ];
     qtserialport = [ ./qtserialport.patch ];
     qtwebengine = lib.optionals stdenv.isDarwin [
diff --git a/pkgs/development/libraries/qt-5/5.15/qtdeclarative-default-disable-qmlcache.patch b/pkgs/development/libraries/qt-5/5.15/qtdeclarative-default-disable-qmlcache.patch
new file mode 100644
index 0000000000000..03668d960c78d
--- /dev/null
+++ b/pkgs/development/libraries/qt-5/5.15/qtdeclarative-default-disable-qmlcache.patch
@@ -0,0 +1,13 @@
+diff --git a/src/qml/qml/qqmltypeloader.cpp b/src/qml/qml/qqmltypeloader.cpp
+index 1d66e75..827567a 100644
+--- a/src/qml/qml/qqmltypeloader.cpp
++++ b/src/qml/qml/qqmltypeloader.cpp
+@@ -727,7 +727,7 @@ bool QQmlTypeLoader::Blob::isDebugging() const
+ 
+ bool QQmlTypeLoader::Blob::diskCacheEnabled() const
+ {
+-    return (!disableDiskCache() && !isDebugging()) || forceDiskCache();
++    return forceDiskCache();
+ }
+ 
+ bool QQmlTypeLoader::Blob::qmldirDataAvailable(const QQmlRefPointer<QQmlQmldirData> &data, QList<QQmlError> *errors)