[all-commits] [llvm/llvm-project] 8fcce5: Revert "[msan] Intercept qsort, qsort_r."

[Reid Kleckner via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 8fcce5ac73d49981656d9126e6c88391c1f6bf01
      https://github.com/llvm/llvm-project/commit/8fcce5ac73d49981656d9126e6c88391c1f6bf01
  Author: Reid Kleckner <rnk at google.com>
  Date:   2019-12-27 (Fri, 27 Dec 2019)

  Changed paths:
    M compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
    M compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
    R compiler-rt/test/msan/qsort.cpp

  Log Message:
  -----------
  Revert "[msan] Intercept qsort, qsort_r."

This reverts commit 7a9ebe95125ea87a494d0c18f44f10bd70e12188, and
dependent commit 54c522420347e58aa7bae1892cf5c5672b57c875, which
disables qsort interception for some iOS platforms.

After this change, the -Nolibc sanitizer common test binary crashes on
startup on my regular Linux workstation, as well as on our bots:
https://ci.chromium.org/p/chromium/builders/try/linux_upload_clang/740

 ********************
  Failing Tests (1):
       SanitizerCommon-Unit ::
       ./Sanitizer-x86_64-Test/SanitizerCommon.NolibcMain

Loading it up in gdb shows that it crashes during relocation processing,
which suggests that some glibc loader versions do not support the
THREADLOCAL data added in this interceptor.