[all-commits] [llvm/llvm-project] 907a0c: [PowerPC] Default ppc64 linux-gnu/freebsd to -fno-PIC

[Fangrui Song via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 907a0cadb2c807d86d3150f2397e6697ba4676df
      https://github.com/llvm/llvm-project/commit/907a0cadb2c807d86d3150f2397e6697ba4676df
  Author: Fangrui Song <maskray at google.com>
  Date:   2020-01-07 (Tue, 07 Jan 2020)

  Changed paths:
    M clang/lib/Driver/ToolChains/Gnu.cpp
    M clang/test/Driver/ppc-abi.c

  Log Message:
  -----------
  [PowerPC] Default ppc64 linux-gnu/freebsd to -fno-PIC

According to D53384, the default was switched from -fno-PIC to -fPIC to
work around a -fsanitize=leak bug on big-endian.

This gratuitous difference between little-endian and big-endian is
undesired, and not acceptable on powerpc64-unknown-freebsd.  If
-fsanitize=leak still has the problem, we should consider defaulting to
-fPIC/-fPIE only when -fsanitize=leak is specified (see SanitizerArgs::requiresPIE())

powerpc64-ibm-aix is unaffected: it still defaults to -fPIC.
powerpc64-linux-musl is unaffected (-fPIE since D39588): it still defaults to -fPIE.

Reviewed By: #powerpc, jhibbits

Differential Revision: https://reviews.llvm.org/D72363