[all-commits] [llvm/llvm-project] 47eeee: [Driver] Default LoongArch to -fno-direct-access-e...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 47eeee297775347cbdb7624d6a766c2a3eec4a59
      https://github.com/llvm/llvm-project/commit/47eeee297775347cbdb7624d6a766c2a3eec4a59
  Author: Fangrui Song <i at maskray.me>
  Date:   2023-11-14 (Tue, 14 Nov 2023)

  Changed paths:
    M clang/lib/Driver/ToolChains/Clang.cpp
    M clang/test/Driver/fdirect-access-external-data.c

  Log Message:
  -----------
  [Driver] Default LoongArch to -fno-direct-access-external-data for non-PIC (#72221)

For -fno-pic, if an extern variable is defined in a DSO, a copy
relocation will be needed. However, loongarch*-linux does not and will
not support copy relocations.

Change Driver to default to -fno-direct-access-external-data for
LoongArch && non-PIC.
Keep Frontend conditions unchanged (-fdirect-access-external-data ||
-fno-direct-access-external-data && PIC>0 => direct access).

Fix #71645