| commit | b18cb6a5d013666b6ac0f29eb8772d33efdf7749 | [log] [tgz] |
|---|---|---|
| author | Adam Langley <agl@google.com> | Tue Apr 04 11:08:28 2017 -0700 |
| committer | CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> | Tue Apr 04 18:19:19 2017 +0000 |
| tree | daa49fd6f6749056467b1356ab5217cf5e72aeac | |
| parent | 42329a828b25259fc47691f5b4a39caf2b29f058 [diff] |
Make the POWER hardware capability value a global in crypto.c.
(Thanks to Sam Panzer for the patch.)
At least some linkers will drop constructor functions if no symbols from
that translation unit are used elsewhere in the program. On POWER, since
the cached capability value isn't a global in crypto.o (like other
platforms), the constructor function is getting discarded.
The C++11 spec says (3.6.2, paragraph 4):
It is implementation-defined whether the dynamic initialization of a
non-local variable with static storage duration is done before the
first statement of main. If the initialization is deferred to some
point in time after the first statement of main, it shall occur
before the first odr-use (3.2) of any function or variable defined
in the same translation unit as the variable to be initialized.
Compilers appear to interpret that to mean they are allowed to drop
(i.e. indefinitely defer) constructors that occur in translation units
that are never used, so they can avoid initializing some part of a
library if it's dropped on the floor.
This change makes the hardware capability value for POWER a global in
crypto.c, which should prevent the constructor function from being
ignored.
Change-Id: I43ebe492d0ac1491f6f6c2097971a277f923dd3e
Reviewed-on: https://boringssl-review.googlesource.com/14664
Commit-Queue: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
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.
There are other files in this directory which might be helpful: