[all-commits] [llvm/llvm-project] aef36e: [clang] Remove old Linux kernel workaround for ens...

[Arthur Eubanks via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: aef36ebb3b74c81589885c61b4fc066052dd9498
      https://github.com/llvm/llvm-project/commit/aef36ebb3b74c81589885c61b4fc066052dd9498
  Author: Arthur Eubanks <aeubanks at google.com>
  Date:   2024-02-12 (Mon, 12 Feb 2024)

  Changed paths:
    M clang/tools/driver/cc1_main.cpp

  Log Message:
  -----------
  [clang] Remove old Linux kernel workaround for ensuring stack space (#81533)

PR #71709 broke the Linux PIE build with `undefined symbol: alloca`
errors. With the newly included `clang/Basic/Builtins.h` in that PR, it
surfaces an issue with a combination of two previous patches.

26670dcba1609574cba5942aff78ff97b567c5f3 added `#undef alloca` so clang
builtins handling of alloca would work under MSVC (unsure if this is
still necessary).

194b6a3b1b1a99cc3c12c466a04320f271ebd8aa added code that calls `alloca`
to workaround a Linux kernel < 4.1 bug. Given that Linux 4.1 was EOL in
2018, it should be ok to remove this workaround.