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| author | David Benjamin <davidben@google.com> | 2016-08-11 13:26:41 -0400 |
|---|---|---|
| committer | David Benjamin <davidben@google.com> | 2016-09-12 13:10:03 -0400 |
| commit | f0c4a6c4bbde5229ceb86740703243fe5c436aad (patch) | |
| tree | f55d7d9db657ca3a8a09c2ae5017a40ad92b15cb /src/BUILDING.md | |
| parent | c501d144b4305c228a0aaa8b3e291510e3b1235b (diff) | |
| download | boringssl-f0c4a6c4bbde5229ceb86740703243fe5c436aad.tar.gz | |
external/boringssl: Sync to 0e9138d2.
This includes the following changes:
https://boringssl.googlesource.com/boringssl/+log/aa24851515d6280aa1d6a8b1548fe74691df3136..0e9138d295cd556e830dc8b3be735e808680f4bd
This requires some build tweaks:
- trusty's rules.mk builds with BORINGSSL_NO_CXX to suppress the new C++
scopers since they build their version of keymaster without the STL.
- BORINGSSL_ENABLE_RC4_TLS to temporarily keep RC4 in the TLS stack.
Change-Id: Ic688ec5779f649a4912b00fb2b55cba64fb07449
Diffstat (limited to 'src/BUILDING.md')
| -rw-r--r-- | src/BUILDING.md | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/BUILDING.md b/src/BUILDING.md index 5631ded8..522bee17 100644 --- a/src/BUILDING.md +++ b/src/BUILDING.md @@ -134,6 +134,18 @@ to enabling the corresponding ARM feature. Note that if a feature is enabled in this way, but not actually supported at run-time, BoringSSL will likely crash. +## Assembling ARMv8 with Clang + +In order to support the ARMv8 crypto instructions, Clang requires that the +architecture be `armv8-a+crypto`. However, setting that as a general build flag +would allow the compiler to assume that crypto instructions are *always* +supported, even without testing for them. + +It's possible to set the architecture in an assembly file using the `.arch` +directive, but only very recent versions of Clang support this. If +`BORINGSSL_CLANG_SUPPORTS_DOT_ARCH` is defined then `.arch` directives will be +used with Clang, otherwise you may need to craft acceptable assembler flags. + # Running tests There are two sets of tests: the C/C++ tests and the blackbox tests. For former |