[all-commits] [llvm/llvm-project] 0fe20a: [libc] support PIE relocations (#78993)

[Schrodinger ZHU Yifan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0fe20aa45eab5f66ac88776f068b7f41b8204aaf
      https://github.com/llvm/llvm-project/commit/0fe20aa45eab5f66ac88776f068b7f41b8204aaf
  Author: Schrodinger ZHU Yifan <yifanzhu at rochester.edu>
  Date:   2024-01-22 (Mon, 22 Jan 2024)

  Changed paths:
    M libc/startup/linux/do_start.cpp

  Log Message:
  -----------
  [libc] support PIE relocations (#78993)

For some reasons, we are using `-fpie`
(libc/cmake/modules/LLVMLibCObjectRules.cmake:31) without supporting it.
According to @lntue, some of the hermetic tests are broken without
proper PIE support. This patch implements basic relocations support for
PIE.