[PATCH] D92633: Add -f[no-]direct-access-external-data to deprecate -mpie-copy-relocations

[Fangrui Song via Phabricator via cfe-commits]

MaskRay added a comment.

In D92633#2434714 <https://reviews.llvm.org/D92633#2434714>, @tmsriram wrote:

> Correct me if I am wrong, but I do see that this behavior is touched.  Line 10 in -fdirect-access-external-data.c :
>
> // RUN: %clang -### -c -target aarch64 %s -fpic -fdirect-access-external-data 2>&1 | FileCheck %s --check-prefix=DIRECT
>
> With -fpic, the variable access will go directly and not via GOT.

`clang/test/Driver/fdirect-access-external-data.c` is a driver test which tests how the driver passes options to CC1.

`clang/lib/CodeGen/CodeGenModule.cpp` says how the CC1 option affects the dso_local specifier in the LLVM IR output. Currently it is a no op for -fpic/-fPIC.

(I have made some tests. It looks like implementing -fno-direct-access-external-data for -fno-pic is not an insurmountable work: ~50 tests)


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D92633/new/

https://reviews.llvm.org/D92633