Remove warnings with gcc 7+

README.md

@@ -39,6 +39,11 @@ the installation:
     sudo apt-get install cmake libglew-dev xorg-dev libcurl4-openssl-dev
     sudo apt-get build-dep glfw
 
+#### Linux (Fedora)
+
+    sudo dnf install cmake glew-devel xorg-x11-proto-devel libcurl-devel openssl-devel
+    sudo dnf builddep glfw
+
 #### Windows
 
 Download and install [CMake](http://www.cmake.org/cmake/resources/software.html)

deps/glfw/src/linux_joystick.c

@@ -25,6 +25,11 @@
 //
 //========================================================================
 
+#define _GNU_SOURCE
+#ifdef __GNUC__
+#define _POSIX_C_SOURCE 200809L
+#endif
+
 #include "internal.h"
 
 #if defined(__linux__)
@@ -230,14 +235,23 @@ int _glfwInitJoysticks(void)
 
         while ((entry = readdir(dir)))
         {
-            char path[20];
+            char* path = NULL;
             regmatch_t match;
 
             if (regexec(&_glfw.linux_js.regex, entry->d_name, 1, &match, 0) != 0)
                 continue;
 
-            snprintf(path, sizeof(path), "%s/%s", dirname, entry->d_name);
+            if (asprintf(&path, "%s/%s", dirname, entry->d_name) < 0)
+            {
+                _glfwInputError(GLFW_PLATFORM_ERROR,
+                                "Linux: Failed to construct device path: %s",
+                                strerror(errno));
+                continue;
+
+            }
+
             openJoystickDevice(path);
+            free(path);
         }
 
         closedir(dir);

deps/glfw/src/monitor.c

@@ -25,6 +25,10 @@
 //
 //========================================================================
 
+#ifdef __GNUC__
+#define _POSIX_C_SOURCE 200809L
+#endif
+
 #include "internal.h"
 
 #include <math.h>

deps/glfw/src/x11_window.c

@@ -25,6 +25,10 @@
 //
 //========================================================================
 
+#ifdef __GNUC__
+#define _POSIX_C_SOURCE 200809L
+#endif
+
 #include "internal.h"
 
 #include <X11/cursorfont.h>

deps/glfw/tests/glfwinfo.c

@@ -34,6 +34,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#ifdef __GNUC__
+#include <strings.h>
+#endif
 
 #include "getopt.h"
 

deps/glfw/tests/joysticks.c

@@ -28,6 +28,10 @@
 //
 //========================================================================
 
+#ifdef __GNUC__
+#define _POSIX_C_SOURCE 200809L
+#endif
+
 #include <GLFW/glfw3.h>
 
 #include <stdio.h>