Unable to emit constant values from sqlite3.h

[jxonas]

I'm wrapping SQLite and at first glance everything went well except for:

// The typedef is necessary to work around problems in certain  C++ compilers.
typedef void (*sqlite3_destructor_type)(void*);
#define SQLITE_STATIC      ((sqlite3_destructor_type)0)
#define SQLITE_TRANSIENT   ((sqlite3_destructor_type)-1)

They were translated to nil instead of a value:

(defparameter %sqlite::+static+ nil)
(defparameter %sqlite::+transient+ nil)

Is it possible to set this up so the values are computed?

Wrapper definition (from https://github.com/Hickory-DMTools/Hickory-SQLite):

(claw:defwrapper (:hickory-sqlite
                  (:system :hickory-sqlite/wrapper)
                  (:headers "sqlite3.h")
                  (:includes :sqlite-includes)
                  (:targets ((:and :x86-64 :linux) "x86_64-pc-linux-gnu")
                            ((:and :x86-64 :windows) "x86_64-w64-mingw32")
                            ((:and :x86-64 :darwin) "x86_64-apple-darwin-gnu"))
                  (:include-extra-values)
                  (:include-definitions "^SQLITE\\w+" "^sqlite3_\\w+")
                  (:persistent t :depends-on ()))
  :in-package :%sqlite
  :recognize-strings t
  :inline-functions nil
  :symbolicate-names (:in-pipeline
                      (:by-removing-prefixes "SQLITE_" "sqlite3_")))

I'm using SBCL 2.2.2 on a Mac. Tried with CCL 1.12.1 and got the same results.

Thanks for the awesome work, by the way!

[borodust]

I've looked into the problem. Unfortunately, to enable this specific edge-case with define that is actually a pointer (to a function) libresect requires a very hairy code. The main reason being that clang_Cursor_Evaluate (what libresect uses for parsing defines internally) can't handle pointers at the moment (clang v13).

You have two ways for a workaround:

• (Less desirable, but simple) Define those variables yourself in CL
• (More desirable, portable and future proof) Create your own .h file with a new defines
  • Include sqlite3.h into your new header file
  • Put a new define there, smth lke #define ANOTHER_SQLITE_STATIC ((int)SQLITE_STATIC) or smth better
  • Add "^ANOTHER_" into claw's defwrapper includes

For the latter approach, it will look smth like this example

• Hand-crafted header
• Wrapper include
• Result