Draft: C Interfacing

This MR enables C compatibility for the generated target code

• Adds SfgConfig.c_interfacing option that automatically marks all function declarations as extern "C"
• Provides hybrid compilation mode for header files where C/C++ includes and also function definitions are guarded by

#ifdef __cplusplus 
<cpp includes...>

#define EXTERNC extern "C"
#else 
<hybrid includes...>

#define EXTERN C
#endif

• Automatically converts C++ header includes, e.g. <cstdint>, to C compatible header includes, e.g. <stdint.h>, for hybrid mode

src/pystencilssfg/emission/file_printer.py

@@ -49,7 +49,7 @@ class SfgFilePrinter:
 
         if file.file_type == SfgSourceFileType.HYBRID_HEADER:
             hybrid_includes = ""
-            for header in file.includes:
+            for header in file.hybrid_includes:
                 incl = str(header) if header.system_header else f'"{str(header)}"'
                 hybrid_includes += f"#include {incl}\n"
 
@@ -63,10 +63,6 @@ class SfgFilePrinter:
         else:
             code += includes
 
-        for header in file.hybrid_includes:
-            incl = str(header) if header.system_header else f'"{str(header)}"'
-            code += f"#include {incl}\n"
-
         if file.includes:
             code += "\n"