Fail the build early if cmake cannot generate the Makefiles.

.travis.yml

@@ -84,17 +84,17 @@ before_script:
     - ccache -s
     - sed -i "s/-march=native//" CMakeLists.txt
     - mkdir build
-    - >
-        eval "ARCH_FLAGS=\${ARCH_FLAGS_${ARCH}}" ;
-        (cd build && cmake
-        -DRAPIDJSON_HAS_STDSTRING=ON
-        -DCMAKE_VERBOSE_MAKEFILE=ON
-        -DCMAKE_BUILD_TYPE=$CONF
-        -DCMAKE_CXX_FLAGS="$ARCH_FLAGS $GCOV_FLAGS"
-        -DCMAKE_EXE_LINKER_FLAGS=$GCOV_FLAGS
-        ..)
 
 script:
+  - >
+      eval "ARCH_FLAGS=\${ARCH_FLAGS_${ARCH}}" ;
+      (cd build && cmake
+      -DRAPIDJSON_HAS_STDSTRING=ON
+      -DCMAKE_VERBOSE_MAKEFILE=ON
+      -DCMAKE_BUILD_TYPE=$CONF
+      -DCMAKE_CXX_FLAGS="$ARCH_FLAGS $GCOV_FLAGS"
+      -DCMAKE_EXE_LINKER_FLAGS=$GCOV_FLAGS
+      ..)
   - cd build
   - make tests
   - make examples