From ec4663e2937e4e0d56fcf57f1bdebfc6f4238b79 Mon Sep 17 00:00:00 2001
From: Andre Meyering <info@andremeyering.de>
Date: Wed, 17 Oct 2018 15:08:44 +0200
Subject: [PATCH] Fix hello_world

---
 .gitignore                    | 3 ++-
 Code/CMakeLists.txt           | 4 ++--
 Code/hello_world/helloWorld.c | 5 ++---
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/.gitignore b/.gitignore
index 0117ac2..3d34267 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 # Verzeichnisse
 Mitschriften/
 build
+build-*
 
 # Dateien
 *_Mitschrift.tex
@@ -229,7 +230,7 @@ cmake_install.cmake
 install_manifest.txt
 compile_commands.json
 CTestTestfile.cmake
-CMakeLists.txt.user
+CMakeLists.txt.user*
 
 # C++
 
diff --git a/Code/CMakeLists.txt b/Code/CMakeLists.txt
index 6f06025..f00b22c 100644
--- a/Code/CMakeLists.txt
+++ b/Code/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required (VERSION 3.8)
 
-if ( CMAKE_COMPILER_IS_GNUCC )
-    set(CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -Wall -Wextra")
+if (CMAKE_COMPILER_IS_GNU)
+    set(CMAKE_C_FLAGS  "${CMAKE_C_FLAGS} -Wall -Wextra")
 endif()
 
 find_package(OpenGL REQUIRED)
diff --git a/Code/hello_world/helloWorld.c b/Code/hello_world/helloWorld.c
index 098a592..eefce2b 100644
--- a/Code/hello_world/helloWorld.c
+++ b/Code/hello_world/helloWorld.c
@@ -17,15 +17,14 @@ void init(int argc, char** argv)
     glLoadIdentity();
     gluOrtho2D(0, width, 0, height);
     glMatrixMode(GL_MODELVIEW);
-    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 }
 
 void display(void)
 {
-    const char* myText = "Hello World!";
+    char* myText = "Hello World!";
     int j;
 
-    glClear(GL_COLOR);
+    glClear(GL_COLOR_BUFFER_BIT);
     glColor3f(1.0, 0.0, 0.0);
 
     glBegin(GL_POLYGON);