Experiment a bit more with Travis.

It's hanging for some reason on OSX build of spirv-tools.

.travis.yml

@@ -13,6 +13,6 @@ before_script:
   - ./checkout_glslang_spirv_tools.sh
 
 script:
-  - ./build_glslang_spirv_tools.sh
+  - ./build_glslang_spirv_tools.sh Release 2
   - make -j2
   - ./test_shaders.sh

build_glslang_spirv_tools.sh

@@ -1,16 +1,26 @@
 #!/bin/bash
 
+PROFILE=Release
+if [ ! -z $1 ]; then
+	PROFILE=$1
+fi
+
+NPROC=$(nproc)
+if [ ! -z $2 ]; then
+	NPROC=$2
+fi
+
 echo "Building glslang."
 mkdir -p external/glslang-build
 cd external/glslang-build
-cmake ../glslang -DCMAKE_BUILD_TYPE=Release -G"Unix Makefiles"
-make -j$(nproc)
+cmake ../glslang -DCMAKE_BUILD_TYPE=$PROFILE -G"Unix Makefiles"
+make -j$NPROC
 cd ../..
 
 echo "Building SPIRV-Tools."
 mkdir -p external/spirv-tools-build
 cd external/spirv-tools-build
-cmake ../spirv-tools -DCMAKE_BUILD_TYPE=Release -G"Unix Makefiles"
-make -j$(nproc)
+cmake ../spirv-tools -DCMAKE_BUILD_TYPE=$PROFILE -G"Unix Makefiles"
+make -j$NPROC
 cd ../..