[all-commits] [llvm/llvm-project] fa2725: [sanitizer] Fall back to fast unwinder

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fa27255d16c322e2d09b5fe05d2b569634f0fb6f
      https://github.com/llvm/llvm-project/commit/fa27255d16c322e2d09b5fe05d2b569634f0fb6f
  Author: Fangrui Song <i at maskray.me>
  Date:   2021-05-14 (Fri, 14 May 2021)

  Changed paths:
    M compiler-rt/lib/sanitizer_common/sanitizer_stacktrace_libcdep.cpp
    A compiler-rt/test/sanitizer_common/TestCases/Linux/symbolize_stack_fp.cpp

  Log Message:
  -----------
  [sanitizer] Fall back to fast unwinder

`-fno-exceptions -fno-asynchronous-unwind-tables` compiled programs don't
produce .eh_frame on Linux and other ELF platforms, so the slow unwinder cannot
print stack traces. Just fall back to the fast unwinder: this allows
-fno-asynchronous-unwind-tables without requiring the sanitizer option
`fast_unwind_on_fatal=1`

Reviewed By: #sanitizers, vitalybuka

Differential Revision: https://reviews.llvm.org/D102046