C23-compliant preprocessor

[ForNeVeR]

The section 6.10 Preprocessing directives of the C standard defines the requirements to the C preprocessor. We should fulfill them.

TODO

• Preprocessor: flow-through the actual source information #525
• Preprocessor: fix handling of multi-line macro parameters #538
• 6.10 Preprocessing directives
  • 6.10.1 Conditional inclusion
    • Preprocessor: CPreprocessorExpressionParser does not support negative numbers #532
    • Preprocessor: undefined variables aren't implicitly converted to zero #534
  • 6.10.2 Source file inclusion
  • 6.10.3 Binary resource inclusion
    • Feature request: C23's #embed preprocessor directive #174
  • 6.10.4 Macro replacement
    • Preprocessor: ... and __VA_ARGS__ support #429
    • Preprocessor: support __VA_OPT__ #541
    • Preprocessor: figure out the rules aroung __VA_ARGS__ and ## #542
    • 6.10.4.1 Argument substitution
    • 6.10.4.2 The # operator
    • 6.10.4.3 The ## operator
    • 6.10.4.4 Rescanning and further replacement
    • 6.10.4.5 Scope of macro definitions
  • 6.10.5 Line control
  • 6.10.6 Diagnostic directives
    • #error
    • #warning
  • 6.10.7 Pragma directive
  • 6.10.8 Null directive
  • 6.10.9 Predefined macro names
    • 6.10.9.1 Mandatory macros
    • 6.10.9.2 Environment macros
    • 6.10.9.3 Conditional feature macros
  • 6.10.10 Pragma operator

Look for the number 77 in the code to find clues to implement this feature.

[kant2002]

Can you update this issue with implemented features