tree be0fc2f8638981b2dbcd4b380bf485f92afd26da
parent dda1670dd59a62d487d2c3ab6a3e921afaa78f74
author Dan Liew <dan@su-root.co.uk> 1545082975 +0000
committer Dan Liew <dan@su-root.co.uk> 1545082975 +0000

Don't trigger sanitizer initialization from `sysctlbyname`  and `sysctl` interceptor.

Summary:
This fixes the `ThreadSanitizer-x86_64-iossim` testsuite which broke
when r348770 (https://reviews.llvm.org/D55473) landed.

The root cause of the problem is that early-on during the iOS simulator
init process a call to `sysctlbyname` is issued. If the TSan initializer
is triggered at this point it will eventually trigger a call to
`__cxa_at_exit(...)`. This call then aborts because the library
implementing this function is not yet had its initialization function
called.

rdar://problem/46696934

Reviewers: kubamracek, george.karpenkov, devnexen, vitalybuka, krytarowski

Subscribers: #sanitizers, llvm-commits

Differential Revision: https://reviews.llvm.org/D55711

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@349402 91177308-0d34-0410-b5e6-96231b3b80d8