Don't enable atomics in NO_THREADS configurations.

In configurations without threads, we're not thread-safe anyway. Instead
use the refcount_lock.c implementation which, in turn, calls into
thread_none.c, so this turns into a plain refcount.

This avoids a build issue on platforms which define NO_THREADS, use C11,
lack C11 atomics, and are missing a __STDC_NO_ATOMICS__ definition. The
platforms ought to define __STDC_NO_ATOMICS__ or implement them, but
atomics are also unnecessary overheard in NO_THREADS configurations

Change-Id: I927e1825dd6474d95226b93dad704594f120450a
Commit-Queue: David Benjamin <>
Commit-Queue: Adam Langley <>
Reviewed-by: Adam Langley <>
1 file changed
tree: ef5b0aa366b426b717b9490fb98d46356ec7874c
  1. .github/
  2. crypto/
  3. decrepit/
  4. fuzz/
  5. include/
  6. ssl/
  7. third_party/
  8. tool/
  9. util/
  10. .clang-format
  11. .gitignore
  15. CMakeLists.txt
  16. codereview.settings
  19. go.mod
  20. go.sum
  26. sources.cmake


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: