SocketCAN: Fix loading libsocketcan on Debian

If only the package libsocketcan2 is installed,
no symlink libsocketcan.so -> libsocketcan.so.2
is created. Therefore loading the library fails.

In that case, retry with explicit version number
given.

[ChangeLog][Plugins][SocketCAN]
Fixed that libsocketcan could not be loaded when
no symlink libsocketcan.so -> libsocketcan.so.2
was present.

Fixes: QTBUG-87328
Change-Id: I815707aa7066fe0e27e702edc316d93c1418ca6d
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>
(cherry picked from commit 9bea986b870e54bd04ccd23f2d204fbae16994b4)

1 files changed, 7 insertions, 3 deletions

diff --git a/src/plugins/canbus/socketcan/libsocketcan.cpp b/src/plugins/canbus/socketcan/libsocketcan.cpp
index c6144db..acc29c7 100644
--- a/src/plugins/canbus/socketcan/libsocketcan.cpp
+++ b/src/plugins/canbus/socketcan/libsocketcan.cpp
@@ -87,10 +87,14 @@ LibSocketCan::LibSocketCan(QString *errorString)
 {
 #if QT_CONFIG(library)
     auto resolveSymbols = [](QLibrary *library) {
+        const QString libName = QStringLiteral("socketcan");
         if (!library->isLoaded()) {
-            library->setFileName(QStringLiteral("socketcan"));
-            if (!library->load())
-                return false;
+            library->setFileName(libName);
+            if (!library->load()) {
+                library->setFileNameAndVersion(libName, 2);
+                if (!library->load())
+                    return false;
+            }
         }
 
         RESOLVE_SYMBOL(can_do_start);