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superenv: treat timingsafe_bcmp as weak on 10.11

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Xcode 8.1 added timingsafe_bcmp to string.h and libsystem_c.tbd,
and 10.12.1 added it to libsystem_c.dylib, but it is not present in
libsystem_c.dylib on 10.11.6 (15G1108).

It may appear in libsystem_c.dylib in a later 10.11 release or it may
be marked weak on 10.11 in a later Xcode release.

Fixes Homebrew/homebrew-core#6344.
This commit is contained in:
ilovezfs 2016-10-29 03:26:52 -07:00
parent 8a7317aa8f
commit e26750e112
1 changed files with 1 additions and 1 deletions
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2
Library/Homebrew/extend/os/mac/extend/ENV/super.rb
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@ -98,7 +98,7 @@ module Superenv
# can't reliably figure this out with Xcode 8 on its own yet.
if MacOS.version == "10.11" && MacOS::Xcode.installed? && MacOS::Xcode.version >= "8.0"
%w[basename_r clock_getres clock_gettime clock_settime dirname_r
getentropy mkostemp mkostemps].each do |s|
getentropy mkostemp mkostemps timingsafe_bcmp].each do |s|
ENV["ac_cv_func_#{s}"] = "no"
end