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fix(bindgen): expand the Fix753 workaround for any type and document it

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Offer documentation to the poor people who stumble on this and look for a macro generation mechanism
on the Rust side.
This commit is contained in:
Raito Bezarius 2024-01-27 02:34:50 +01:00 committed by Kent Overstreet
parent 234fe664b1
commit 5a1975e528
2 changed files with 18 additions and 5 deletions
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2
bch_bindgen/build.rs
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@ -64,7 +64,7 @@ fn main() {
.blocklist_type("srcu_struct")
.allowlist_var("BCH_.*")
.allowlist_var("KEY_SPEC_.*")
.allowlist_var("Fix753_FMODE_.*")
.allowlist_var("Fix753_.*")
.allowlist_var("bch.*")
.allowlist_var("__bch2.*")
.allowlist_var("__BTREE_ITER.*")

21
bch_bindgen/src/libbcachefs_wrapper.h
View File

@ -14,9 +14,22 @@
#include "cmds.h"
#include "raid/raid.h"
/* Fix753 is a workaround for https://github.com/rust-lang/rust-bindgen/issues/753
* Functional macro are not expanded with bindgen, e.g. ioctl are automatically ignored
* from the generation
*
* To avoid this, use `MARK_FIX_753` to force the synthesis of your macro constant.
* It will appear in Rust with its proper name and not Fix753_{name}.
*/
#define MARK_FIX_753(req_name) const blk_mode_t Fix753_##req_name = req_name;
/* MARK_FIX_753: force generate a macro constant in Rust
*
* @type_name - a type for this constant
* @req_name - a name for this constant which will be used inside of Rust
*/
#define MARK_FIX_753(type_name, req_name) const type_name Fix753_##req_name = req_name;
MARK_FIX_753(blk_mode_t, BLK_OPEN_READ);
MARK_FIX_753(blk_mode_t, BLK_OPEN_WRITE);
MARK_FIX_753(blk_mode_t, BLK_OPEN_EXCL);
MARK_FIX_753(BLK_OPEN_READ);
MARK_FIX_753(BLK_OPEN_WRITE);
MARK_FIX_753(BLK_OPEN_EXCL);