no longer forces g++ on Makefiles, adds test targets, treat warnings as errors

Author: dassencio

.travis.yml

@@ -1,13 +1,24 @@
 language: cpp
 
-dist: trusty
+matrix:
+  include:
 
-git:
-  depth: 3
+    # build and run all tests on Linux (compile with g++)
+    - os: linux
+      dist: trusty
+      compiler: gcc
+
+    # build and run all tests on Linux (compile with clang++)
+    - os: linux
+      dist: trusty
+      compiler: clang
 
 script:
   - ./run-tests
 
+git:
+  depth: 3
+
 notifications:
   email:
     recipients:

chapter01/1.01/Makefile

@@ -1,7 +1,12 @@
+CXXFLAGS := -g -std=c++11 -Wall -Wextra -Werror
+
 all: solve
 
 solve: solve.cpp
-	g++ -g -std=c++11 solve.cpp -o solve -Wall -Wextra
+	$(CXX) $(CXXFLAGS) solve.cpp -o solve
+
+test: solve
+	./solve
 
 clean:
 	rm -f solve