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, 38 insertions, 0 deletions

diff --git a/source/core/platform.h b/source/core/platform.h
new file mode 100644
index 000000000..fef698e6f
--- /dev/null
+++ b/source/core/platform.h
@@ -0,0 +1,38 @@
+// platform.h
+#ifndef SLANG_CORE_PLATFORM_H_INCLUDED
+#define SLANG_CORE_PLATFORM_H_INCLUDED
+
+namespace Slang
+{
+	// Interface for working with shared libraries
+	// in a platfomr-independent fashion.
+	struct SharedLibrary
+	{
+		typedef struct SharedLibraryImpl* Handle;
+		Handle handle;
+
+		// Attempt to load a shared library for
+		// the current platform.
+		static SharedLibrary load(char const* name);
+
+		// If this refers to a valid loaded library,
+		// then attempt to unload it
+		void unload();
+
+		typedef void (*FuncPtr)(void);
+
+		FuncPtr findFuncByName(char const* name);
+
+
+		operator Handle() { return handle; }
+	};
+
+#ifndef _MSC_VER
+	#define _fileno fileno
+	#define _isatty isatty
+	#define _setmode setmode
+	#define _O_BINARY O_BINARY
+#endif
+}
+
+#endif