[all-commits] [llvm/llvm-project] 1c1128: [clang][driver] Do not emit default '-Tdata' for A...

[Ben Shi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1c112897b20274852a9280d20cebd5c9f3619a7a
      https://github.com/llvm/llvm-project/commit/1c112897b20274852a9280d20cebd5c9f3619a7a
  Author: Ben Shi <powerman1st at 163.com>
  Date:   2023-03-01 (Wed, 01 Mar 2023)

  Changed paths:
    M clang/lib/Driver/ToolChains/AVR.cpp
    M clang/test/Driver/avr-ld.c

  Log Message:
  -----------
  [clang][driver] Do not emit default '-Tdata' for AVR devices

Different AVR devices have different data regions. Current clang
driver emits a default '-Tdata' option to the linker. This way
works fine if there is no user specified linker script, but it
will cause conflicts if there is one.

A better solution for setting the default data region to GNU ld
is defining symbol __DATA_REGION_ORIGIN__, which is expected by
GNU ld's default AVR linker script.

Fixes https://github.com/llvm/llvm-project/issues/60362

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D144533