Also search the main bundle plugin path for plugins on Apple OSes.

The default value of QLibraryInfo::PluginsPath is $prefix/plugins,
where $prefix is the path to the bundle's contents directory
(for example, .../foo.app/Contents/ on OS X, or .../foo.app/ on iOS).

On Apple platforms the directory is actually called "PlugIns".
Plugins could previously be loaded on OS X by coincidence, but
if the system is using an HFS+ Case Sensitive filesystem (and this
is ALWAYS the case on iOS-like operating systems), the case
mismatch would cause plugins in an application bundle not to be
found/loaded.

This change allows plugins to be located in application bundles
on Apple platforms regardless of the HFS+ case sensitivity mode
and without needing to specify a qt.conf file.

Change-Id: Ie0a0f7448fbf5fb410aa77944ba0d01895bb05e3
Reviewed-by: Morten Johan Sørvig <morten.sorvig@theqtcompany.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/corelib/kernel/qcoreapplication.cpp b/src/corelib/kernel/qcoreapplication.cpp
index 79a3254a39..38efc44399 100644
--- a/src/corelib/kernel/qcoreapplication.cpp
+++ b/src/corelib/kernel/qcoreapplication.cpp
@@ -2498,6 +2498,26 @@ QStringList QCoreApplication::libraryPaths()
             }
         }
 
+#ifdef Q_OS_DARWIN
+        // Check the main bundle's PlugIns directory as this is a standard location for Apple OSes.
+        // Note that the QLibraryInfo::PluginsPath below will coincidentally be the same as this value
+        // but with a different casing, so it can't be relied upon when the underlying filesystem
+        // is case sensitive (and this is always the case on newer OSes like iOS).
+        if (CFBundleRef bundleRef = CFBundleGetMainBundle()) {
+            if (QCFType<CFURLRef> urlRef = CFBundleCopyBuiltInPlugInsURL(bundleRef)) {
+                if (QCFType<CFURLRef> absoluteUrlRef = CFURLCopyAbsoluteURL(urlRef)) {
+                    if (QCFString path = CFURLCopyFileSystemPath(absoluteUrlRef, kCFURLPOSIXPathStyle)) {
+                        if (QFile::exists(path)) {
+                            path = QDir(path).canonicalPath();
+                            if (!app_libpaths->contains(path))
+                                app_libpaths->append(path);
+                        }
+                    }
+                }
+            }
+        }
+#endif // Q_OS_DARWIN
+
         QString installPathPlugins =  QLibraryInfo::location(QLibraryInfo::PluginsPath);
         if (QFile::exists(installPathPlugins)) {
             // Make sure we convert from backslashes to slashes.