Fail to detect Xcode 7 for Intel AVX code

[Jun Sun]

Hi,

I just found the perl script for x86_64 assembly failed to detect Xcode 7 environment (Apple LLVM 7.x), and skipped generating AVX code for MAC OS ($avx variable is always false). The reason is Apple since Xcode 7.0 removed string "based on LLVM x.y.z" from version information. Now the clang -v command returns:


Apple LLVM version 7.0.0 (clang-700.1.76)

Target: x86_64-apple-darwin15.0.0

Thread model: posix

So the way to detect compiler version becomes to check either "LLVM version" or "clang-". Here is a patch to check the first string (take rsaz-avx2.pl as an example):


if (!$avx && `$ENV{CC} -v 2>&1` =~ /LLVM version ([0-9]+)\./) {

$avx = ($1>=5) + ($1>=5);

$addx = ($1>=5);

}

Version number 5 is used but not 7 due to the reason Apple start AVX support from Xcode 5 (LLVM 5).

A list of Xcode records can be found here:
https://gist.github.com/yamaya/2924292
[https://avatars0.githubusercontent.com/u/278790?v=3&s=400]<https://gist.github.com/yamaya/2924292>

Xcode clang version record · GitHub
After today's update of command line tools/xcode I get: About Xcode: Version 6.3 (6D570) /usr/bin/clang++ --version Apple LLVM version 6.1.0 (clang-602.0.49) (based ...
Read more...<https://gist.github.com/yamaya/2924292>





This email and any attachments are for the sole use of the intended recipients and may be privileged or confidential. Any distribution, printing or other use by anyone else is prohibited. If you are not an intended recipient, please contact the sender immediately, and permanently delete this email and attachments.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mta.openssl.org/pipermail/openssl-bugs-mod/attachments/20151113/e526f59a/attachment.html>