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/composer/basic_composer.py

@@ -15,6 +15,7 @@ from pystencils import (
 )
 from pystencils.codegen import Kernel
 from pystencils.types import create_type, UserTypeSpec, PsType
+from pystencilssfg.ir import SfgSourceFileType
 
 from ..context import SfgContext, SfgCursor
 from .custom import CustomGenerator
@@ -716,6 +717,10 @@ class SfgFunctionSequencer(SfgFunctionSequencerBase):
     """Sequencer for constructing functions."""
 
     def __call__(self, *args: SequencerArg) -> None:
+        # check if header is in HYBRID mode for c_interfacing enabled
+        if self._cursor.context.c_interfacing:
+            assert isinstance(self._cursor.context.header_file.file_type, SfgSourceFileType.HYBRID_HEADER)
+
         """Populate the function body"""
         tree = make_sequence(*args)
         func = SfgFunction(