First attempt at a Linux build (#193)

* First attempt at a Linux build

- Fix up places where C++ idioms were written assuming lenient behavior of Microsoft's compiler

- Add a few more alternatives for platform-specific behavior where Windows was the only platform accounted for.

- Add a basic Makefile that can at least invoke our build, even if it isn't going good dependency tracking, etc.

- Build `libslang.so` and `slangc` that depends on it, using a relative `RPATH` to make the binary portable (I hope)

- Add an initial `.travis.yml` to see if we can trigger their build process.

* Fixup: const bug in `List::Sort`

I'm not clear why this gets picked up by the gcc *and* clang that Travis uses, but not the (newer) gcc I'm using on Ubuntu here, but I'm hoping it is just some missing `const` qualifiers.

* Fixup: reorder specialization of "class info"

Clang complains about things being specialized after being instantiated (implicilty), and I hope it is just the fact that I generate the class info for the roots of the hierarchy after the other cases. We'll see.

* Fixup: add `platform.cpp` to unified/lumped build

* Fixup: Windows uses `FreeLibrary`

and not `UnloadLibrary`

* Fixup: fix Windows project file to include new source file

This obviously points to the fact that we are going to need to be generating these files sooner or later.

1 files changed, 74 insertions, 0 deletions

diff --git a/source/core/platform.cpp b/source/core/platform.cpp
new file mode 100644
index 000000000..dbb536b0f
--- /dev/null
+++ b/source/core/platform.cpp
@@ -0,0 +1,74 @@
+// platform.cpp
+#include "platform.h"
+
+#ifdef _WIN32
+	#define WIN32_LEAN_AND_MEAN
+	#define NOMINMAX
+	#include <Windows.h>
+	#undef WIN32_LEAN_AND_MEAN
+	#undef NOMINMAX
+#else
+	#include <dlfcn.h>
+#endif
+
+namespace Slang
+{
+	// SharedLibrary
+
+	SharedLibrary SharedLibrary::load(char const* name)
+	{
+		SharedLibrary result;
+		result.handle = nullptr;
+
+#ifdef _WIN32
+		{
+			HMODULE h = LoadLibraryA(name);
+			result.handle = (Handle) h;			
+		}
+#else
+		{
+			void* h = dlopen(name, RTLD_LOCAL);
+			result.handle = (Handle) h;
+
+		}
+#endif
+
+		return result;
+	}
+
+	void SharedLibrary::unload()
+	{
+#ifdef _WIN32
+		{
+			FreeLibrary(
+				(HMODULE) handle);
+		}
+#else
+		{
+			dlclose(handle);
+		}
+#endif
+
+	}
+
+	SharedLibrary::FuncPtr SharedLibrary::findFuncByName(char const* name)
+	{
+		FuncPtr funcPtr = nullptr;
+
+#ifdef _WIN32
+		{
+			funcPtr = (FuncPtr) GetProcAddress(
+				(HMODULE) handle,
+				name);
+		}
+#else
+		{
+			funcPtr = (FuncPtr) dlsym(
+				(void*) handle,
+				name);
+		}
+#endif
+
+		return funcPtr;
+	}
+}
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