[all-commits] [llvm/llvm-project] 3ce06b: [Clang][Driver] Expose relocation model as multili...

[Simon Tatham via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3ce06b8c2196be6368f0e06862ac1849379cce41
      https://github.com/llvm/llvm-project/commit/3ce06b8c2196be6368f0e06862ac1849379cce41
  Author: Simon Tatham <simon.tatham at arm.com>
  Date:   2025-07-18 (Fri, 18 Jul 2025)

  Changed paths:
    M clang/lib/Driver/ToolChain.cpp
    M clang/test/Driver/print-multi-selection-flags.c

  Log Message:
  -----------
  [Clang][Driver] Expose relocation model as multilib flags (#149132)

If a multilib collection contains libraries built for different methods
of accessing global data (via absolute address, or via a GOT in -fPIC
style, or as an offset from a fixed register in Arm -frwpi style), then
`multilib.yaml` will need to know which relocation model an application
is using in order to select the right library.

Even if a multilib collection only supports one relocation model, it's
still useful for `multilib.yaml` to be able to tell if the user has
selected the right one, so as to give a useful error message if they
haven't, instead of silently selecting a library that won't work.

In this commit we determine the PIC / ROPI / RWPI status using the
existing logic in `ParsePICArgs`, and translate it back into a canonical
set of multilib selection flags.



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