feat: implement override for GLFW/OpenAL with split natives

Fixes PrismLauncher/PrismLauncher#513

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

launcher/MangoHud.cpp

@@ -16,6 +16,7 @@
  *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+#include <QDebug>
 #include <QDir>
 #include <QString>
 #include <QStringList>
@@ -26,6 +27,15 @@
 #include "Json.h"
 #include "MangoHud.h"
 
+#ifdef __GLIBC__
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#define UNDEF_GNU_SOURCE
+#endif
+#include <dlfcn.h>
+#include <linux/limits.h>
+#endif
+
 namespace MangoHud {
 
 QString getLibraryString()
@@ -106,4 +116,37 @@ QString getLibraryString()
 
     return QString();
 }
+
+QString findLibrary(QString libName)
+{
+#ifdef __GLIBC__
+    const char* library = libName.toLocal8Bit().constData();
+
+    void* handle = dlopen(library, RTLD_NOW);
+    if (!handle) {
+        qCritical() << "dlopen() failed:" << dlerror();
+        return {};
+    }
+
+    char path[PATH_MAX];
+    if (dlinfo(handle, RTLD_DI_ORIGIN, path) == -1) {
+        qCritical() << "dlinfo() failed:" << dlerror();
+        dlclose(handle);
+        return {};
+    }
+
+    auto fullPath = FS::PathCombine(QString(path), libName);
+
+    dlclose(handle);
+    return fullPath;
+#else
+    qWarning() << "MangoHud::findLibrary is not implemented on this platform";
+    return {};
+#endif
+}
 }  // namespace MangoHud
+
+#ifdef UNDEF_GNU_SOURCE
+#undef _GNU_SOURCE
+#undef UNDEF_GNU_SOURCE
+#endif