Work around bindgen bug around constants

Due to https://github.com/rust-lang/rust-bindgen/issues/923, bindgen
does not evaluate constants correctly. This means arithemetic is done
with the wrong type, and more importantly the output has the wrong type.

Ultimately, this is a bug in bindgen, but as that's remains unfixed,
we'll have to work around it.

rust-openssl's bindgen mode works around this by using the build.rs
bindgen driver and registering a callback to fix the type. This won't
work for some of our consumers, which require a hermetic and
reproducible builds. Instead, apply bssl-sys's workaround at the lib.rs
level. This removes a divergence between bssl-sys and rust-openssl's
bindgen mode.

Fixing these types does not mean we recommending using all of these
constants! Many of the options here are ill-defined or produce even more
ambiguous output than most. XN_FLAG_COMPAT is especially fun because it
change the calling convention! The only option anyone should use is
XN_FLAG_RFC2253, as that's at least a well-defined output.

Fixed: 636
Change-Id: Id34b4a46e0cfd6dcb275477d9bb915bda66c787d
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/66228
Reviewed-by: Bob Beck <bbe@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
1 file changed
tree: d80cd28a33d088717b7e309139751fc7c1e4f2f4
  1. .github/
  2. cmake/
  3. crypto/
  4. decrepit/
  5. fuzz/
  6. include/
  7. pki/
  8. rust/
  9. ssl/
  10. third_party/
  11. tool/
  12. util/
  13. .clang-format
  14. .gitignore
  15. API-CONVENTIONS.md
  16. BREAKING-CHANGES.md
  17. BUILDING.md
  18. CMakeLists.txt
  19. codereview.settings
  20. CONTRIBUTING.md
  21. FUZZING.md
  22. go.mod
  23. go.sum
  24. INCORPORATING.md
  25. LICENSE
  26. PORTING.md
  27. README.md
  28. SANDBOXING.md
  29. sources.cmake
  30. STYLE.md
README.md

BoringSSL

BoringSSL is a fork of OpenSSL that is designed to meet Google's needs.

Although BoringSSL is an open source project, it is not intended for general use, as OpenSSL is. We don't recommend that third parties depend upon it. Doing so is likely to be frustrating because there are no guarantees of API or ABI stability.

Programs ship their own copies of BoringSSL when they use it and we update everything as needed when deciding to make API changes. This allows us to mostly avoid compromises in the name of compatibility. It works for us, but it may not work for you.

BoringSSL arose because Google used OpenSSL for many years in various ways and, over time, built up a large number of patches that were maintained while tracking upstream OpenSSL. As Google's product portfolio became more complex, more copies of OpenSSL sprung up and the effort involved in maintaining all these patches in multiple places was growing steadily.

Currently BoringSSL is the SSL library in Chrome/Chromium, Android (but it's not part of the NDK) and a number of other apps/programs.

Project links:

There are other files in this directory which might be helpful: