diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9b508c21b..aae02a5fa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,14 @@ See the [roadmap](https://github.com/niessner/Opt/blob/master/ROADMAP.md) for ne
 
 ## [Unreleased]
 
+### Changed
+- Renamed isUnknown parameter in C++ wrapper class OptImage to usesOptFloat
+- Removed internal Opt compiler cruft.
+
+### Fixed
+- Small robustness changes for compilers. (mihaibujanca)
+
+
 ## [0.2.2] - 2017-11-29
 ### Added
 - Higher verbosity levels, along with documentation
diff --git a/examples/shape_from_shading/src/SFSSolverInput.h b/examples/shape_from_shading/src/SFSSolverInput.h
index 5c93e14e4..ca7e9a03a 100644
--- a/examples/shape_from_shading/src/SFSSolverInput.h
+++ b/examples/shape_from_shading/src/SFSSolverInput.h
@@ -8,8 +8,8 @@
 static  std::shared_ptr<OptImage> createWrapperOptImage(std::shared_ptr<SimpleBuffer> simpleBuffer) {
     std::vector<unsigned int> dims = { (unsigned int)simpleBuffer->width(), (unsigned int)simpleBuffer->height() };
     OptImage::Type t = (simpleBuffer->type() == SimpleBuffer::DataType::FLOAT) ? OptImage::Type::FLOAT : OptImage::Type::UCHAR;
-    bool isUnknown = (t == OptImage::Type::FLOAT);
-    return std::shared_ptr<OptImage>(new OptImage(dims, simpleBuffer->data(), t, 1, OptImage::Location::GPU, isUnknown, false));
+    bool usesOptFloat = (t == OptImage::Type::FLOAT);
+    return std::shared_ptr<OptImage>(new OptImage(dims, simpleBuffer->data(), t, 1, OptImage::Location::GPU, usesOptFloat, false));
 }
 
 struct SFSSolverInput {
diff --git a/examples/shared/NamedParameters.h b/examples/shared/NamedParameters.h
index 4643ba76b..7618d9633 100644
--- a/examples/shared/NamedParameters.h
+++ b/examples/shared/NamedParameters.h
@@ -24,7 +24,7 @@ class NamedParameters {
     std::vector<Parameter> unknownParameters() const {
         std::vector<Parameter> params;
         for (auto p : m_parameters) {
-            if (p.im && p.im->isUnknown()) {
+            if (p.im && p.im->usesOptFloat()) {
                 params.push_back(p);
             }
         }
diff --git a/examples/shared/OptImage.h b/examples/shared/OptImage.h
index 1e06825f1..e84eebce6 100644
--- a/examples/shared/OptImage.h
+++ b/examples/shared/OptImage.h
@@ -15,8 +15,8 @@ class OptImage {
 public:
     enum Type { FLOAT, DOUBLE, UCHAR, INT };
     enum Location { CPU, GPU };
-    OptImage(std::vector<unsigned int> dims, void* data, Type type, unsigned int channelCount, Location location, bool isUnknown = false, bool ownsData = false) :
-        m_dims(dims), m_data(data), m_type(type), m_channelCount(channelCount), m_location(location), m_isUnknown(isUnknown), m_ownsData(ownsData) {
+    OptImage(std::vector<unsigned int> dims, void* data, Type type, unsigned int channelCount, Location location, bool usesOptFloat = false, bool ownsData = false) :
+        m_dims(dims), m_data(data), m_type(type), m_channelCount(channelCount), m_location(location), m_usesOptFloat(usesOptFloat), m_ownsData(ownsData) {
     }
 
     ~OptImage() {
@@ -33,7 +33,7 @@ class OptImage {
     Location location() const { return m_location; }
     Type type() const { return m_type; }
     std::vector<unsigned int> dims() const { return m_dims; }
-    bool isUnknown() const { return m_isUnknown; }
+    bool usesOptFloat() const { return m_usesOptFloat; }
 
     size_t dataSize() const { return totalElementsFromDims(m_dims) * OptImage::typeSize(m_type) * m_channelCount; }
 
@@ -86,13 +86,13 @@ class OptImage {
     std::vector<unsigned int> m_dims;
     unsigned int m_channelCount = 0;
     void* m_data = nullptr;
-    bool m_isUnknown = false;
+    bool m_usesOptFloat = false;
     Type m_type = Type::FLOAT;
     Location m_location = Location::CPU;
 };
 
 
-static std::shared_ptr<OptImage> createEmptyOptImage(std::vector<unsigned int> dims, OptImage::Type type, unsigned int channelCount, OptImage::Location location, bool isUnknown) {
+static std::shared_ptr<OptImage> createEmptyOptImage(std::vector<unsigned int> dims, OptImage::Type type, unsigned int channelCount, OptImage::Location location, bool usesOptFloat) {
     void* data;
     size_t size = totalElementsFromDims(dims) * OptImage::typeSize(type) * channelCount;
     if (location == OptImage::Location::CPU) {
@@ -100,7 +100,7 @@ static std::shared_ptr<OptImage> createEmptyOptImage(std::vector<unsigned int> d
     } else {
         cudaSafeCall(cudaMalloc(&data, size));
     }
-    return std::shared_ptr<OptImage>(new OptImage(dims, data, type, channelCount, location, isUnknown, true));
+    return std::shared_ptr<OptImage>(new OptImage(dims, data, type, channelCount, location, usesOptFloat, true));
 }
 
 static void copyImage(const std::shared_ptr<OptImage>& dst, const std::shared_ptr<OptImage>& src) {
@@ -111,7 +111,7 @@ static void copyImage(const std::shared_ptr<OptImage>& dst, const std::shared_pt
 }
 
 static std::shared_ptr<OptImage> copyImageTo(const std::shared_ptr<OptImage>& original, OptImage::Location location) {
-    std::shared_ptr<OptImage> newIm = createEmptyOptImage(original->dims(), original->type(), original->channelCount(), location, original->isUnknown());
+    std::shared_ptr<OptImage> newIm = createEmptyOptImage(original->dims(), original->type(), original->channelCount(), location, original->usesOptFloat());
     copyImage(newIm, original);
     return newIm;
 }
@@ -119,7 +119,7 @@ static std::shared_ptr<OptImage> copyImageTo(const std::shared_ptr<OptImage>& or
 // Only CPU->CPU
 static std::shared_ptr<OptImage> getDoubleImageFromFloatImage(const std::shared_ptr<OptImage> floatImage) {
     assert(floatImage->location() == OptImage::Location::CPU && floatImage->type() == OptImage::Type::FLOAT);
-    std::shared_ptr<OptImage> newIm = createEmptyOptImage(floatImage->dims(), OptImage::Type::DOUBLE, floatImage->channelCount(), floatImage->location(), floatImage->isUnknown());
+    std::shared_ptr<OptImage> newIm = createEmptyOptImage(floatImage->dims(), OptImage::Type::DOUBLE, floatImage->channelCount(), floatImage->location(), floatImage->usesOptFloat());
     float* fPtr = (float*)floatImage->data();
     double* dPtr = (double*)newIm->data();
     for (size_t i = 0; i < totalElementsFromDims(floatImage->dims()) * floatImage->channelCount(); ++i) {
@@ -131,7 +131,7 @@ static std::shared_ptr<OptImage> getDoubleImageFromFloatImage(const std::shared_
 // Only CPU->CPU
 static std::shared_ptr<OptImage> getFloatImageFromDoubleImage(const std::shared_ptr<OptImage> doubleImage) {
     assert(doubleImage->location() == OptImage::Location::CPU && doubleImage->type() == OptImage::Type::DOUBLE);
-    std::shared_ptr<OptImage> newIm = createEmptyOptImage(doubleImage->dims(), OptImage::Type::FLOAT, doubleImage->channelCount(), doubleImage->location(), doubleImage->isUnknown());
+    std::shared_ptr<OptImage> newIm = createEmptyOptImage(doubleImage->dims(), OptImage::Type::FLOAT, doubleImage->channelCount(), doubleImage->location(), doubleImage->usesOptFloat());
     double* dPtr = (double*)doubleImage->data();
     float* fPtr = (float*)newIm->data();
     for (size_t i = 0; i < totalElementsFromDims(doubleImage->dims()) * doubleImage->channelCount(); ++i) {