add .travis.yml

.travis.yml

@@ -0,0 +1,9 @@
+language: cpp
+
+install: |
+  cd "$TRAVIS_BUILD_DIR"
+  ./configure -t
+
+script: |
+  cd "$TRAVIS_BUILD_DIR"
+  ./run -n

configure

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+y=''
+while getopts t OPT; do
+  case "$OPT" in
+    t)
+      y='-y'
+      ;;
+  esac
+done
+shift $(($OPTIND - 1))
+sudo apt-get update $y
+# Building SDL for QEMU in Buildroot was rejected upstream because it adds many dependencies:
+# https://patchwork.ozlabs.org/patch/770684/
+# We are just using the host SDL for now, if it causes too much problems we might remove it.
+# libsdl2-dev needs to be installed separatedly from sudo apt-get build-dep qemu
+# because Ubuntu 16.04's QEMU uses SDL 1.
+sudo apt-get install $y build-essential libsdl2-dev
+sudo apt-get build-dep $y qemu

getting-started.md

@@ -46,8 +46,7 @@ Reserve 12Gb of disk:
 
     git clone --recursive https://github.com/cirosantilli/linux-kernel-module-cheat
     cd linux-kernel-module-cheat
-    sudo apt-get install libsdl2-dev
+    ./configure
-    sudo apt-get build-dep qemu
     ./run
 
 The first build will take a while ([GCC](https://stackoverflow.com/questions/10833672/buildroot-environment-with-host-toolchain), Linux kernel), e.g.:

run

@@ -53,11 +53,6 @@ make O="$outdir" olddefconfig
 #
 # Even if were an autotools package, there is no general way currently to pass extra configs to it:
 # https://stackoverflow.com/questions/44341188/how-to-pass-extra-custom-configure-autotools-options-to-a-buildroot-package/44341225#44341225
-#
-# SDL support was rejected upstream because it adds many dependencies: https://patchwork.ozlabs.org/patch/770684/
-# We are just using the host SDL for now, if it causes too much problems we might remove it.
-# libsdl2-dev needs to be installed separatedly from sudo apt-get build-dep qemu
-# because Ubuntu 16.04's QEMU uses SDL 1.
 time \
   env \
   -u LD_LIBRARY_PATH \