Print dlerror() in lib loaders

src/gl/inject_glx.cpp

@@ -36,6 +36,10 @@ void* get_glx_proc_address(const char* name) {
     if (!func)
         func = get_proc_address( name );
 
+    if (!func) {
+        std::cerr << "MANGOHUD: Failed to get function '" << name << "'" << std::endl;
+    }
+
     return func;
 }
 

src/loaders/loader_dbus.cpp

@@ -1,5 +1,6 @@
 
 #include "loaders/loader_dbus.h"
+#include <iostream>
 
 // Put these sanity checks here so that they fire at most once
 // (to avoid cluttering the build output).
@@ -24,8 +25,10 @@ bool libdbus_loader::Load(const std::string& library_name) {
 
 #if defined(LIBRARY_LOADER_DBUS_H_DLOPEN)
   library_ = dlopen(library_name.c_str(), RTLD_LAZY);
-  if (!library_)
+  if (!library_) {
+    std::cerr << "MANGOHUD: " << library_name << " dlopen failed: " << dlerror() << std::endl;
     return false;
+  }
 
 
   bus_add_match =

src/loaders/loader_glx.cpp

@@ -17,7 +17,7 @@ bool glx_loader::Load() {
   // Force load libGL
   void *handle = real_dlopen("libGL.so.1", RTLD_LAZY);
   if (!handle) {
-    std::cerr << "MANGOHUD: couldn't find libGL.so.1" << std::endl;
+    std::cerr << "MANGOHUD: couldn't find libGL.so.1: " << dlerror() << std::endl;
     return false;
   }
 

src/loaders/loader_nvctrl.cpp

@@ -1,7 +1,5 @@
-// This is generated file. Do not modify directly.
-// Path to the code generator: /home/crz/git/MangoHud/generate_library_loader.py .
-
 #include "loader_nvctrl.h"
+#include <iostream>
 
 // Put these sanity checks here so that they fire at most once
 // (to avoid cluttering the build output).
@@ -26,8 +24,10 @@ bool libnvctrl_loader::Load(const std::string& library_name) {
 
 #if defined(LIBRARY_LOADER_NVCTRL_H_DLOPEN)
   library_ = dlopen(library_name.c_str(), RTLD_LAZY);
-  if (!library_)
+  if (!library_) {
+    std::cerr << "MANGOHUD: " << library_name << " dlopen failed: " << dlerror() << std::endl;
     return false;
+  }
 
   XNVCTRLIsNvScreen =
       reinterpret_cast<decltype(this->XNVCTRLIsNvScreen)>(

src/loaders/loader_x11.cpp

@@ -1,5 +1,5 @@
 #include "loader_x11.h"
-#include "real_dlsym.h"
+#include <iostream>
 
 libx11_loader::libx11_loader() : loaded_(false) {
 }
@@ -13,9 +13,11 @@ bool libx11_loader::Load(const std::string& library_name) {
     return false;
   }
 
-  library_ = real_dlopen(library_name.c_str(), RTLD_LAZY);
-  if (!library_)
+  library_ = dlopen(library_name.c_str(), RTLD_LAZY);
+  if (!library_) {
+    std::cerr << "MANGOHUD: " << library_name << " dlopen failed: " << dlerror() << std::endl;
     return false;
+  }
 
 
   XOpenDisplay =