[all-commits] [llvm/llvm-project] eb31c4: [Driver] Add support for GCC installation detectio...

[Garvit Gupta via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: eb31c422d0dc816bf285a81bf92690d4d16273ed
      https://github.com/llvm/llvm-project/commit/eb31c422d0dc816bf285a81bf92690d4d16273ed
  Author: Garvit Gupta <quic_garvgupt at quicinc.com>
  Date:   2025-06-17 (Tue, 17 Jun 2025)

  Changed paths:
    M clang/docs/Toolchain.rst
    M clang/include/clang/Basic/DiagnosticDriverKinds.td
    M clang/lib/Driver/ToolChains/BareMetal.cpp
    M clang/lib/Driver/ToolChains/BareMetal.h
    A clang/test/Driver/Inputs/basic_aarch64_gcc_tree/aarch64-none-elf/include/c++/8.2.1/.keep
    A clang/test/Driver/Inputs/basic_aarch64_gcc_tree/aarch64-none-elf/lib/.keep
    A clang/test/Driver/Inputs/basic_aarch64_gcc_tree/aarch64-none-elf/lib/crt0.o
    A clang/test/Driver/Inputs/basic_aarch64_gcc_tree/bin/aarch64-none-elf-ld
    A clang/test/Driver/Inputs/basic_aarch64_gcc_tree/lib/gcc/aarch64-none-elf/8.2.1/crtbegin.o
    A clang/test/Driver/Inputs/basic_aarch64_gcc_tree/lib/gcc/aarch64-none-elf/8.2.1/crtend.o
    A clang/test/Driver/Inputs/basic_aarch64_nogcc_tree/aarch64-none-elf/lib/crt0.o
    A clang/test/Driver/Inputs/basic_aarch64_nogcc_tree/aarch64-none-elf/lib/crtbegin.o
    A clang/test/Driver/Inputs/basic_aarch64_nogcc_tree/aarch64-none-elf/lib/crtend.o
    A clang/test/Driver/Inputs/basic_aarch64_nogcc_tree/bin/aarch64-none-elf-ld
    A clang/test/Driver/Inputs/basic_arm_gcc_tree/armv6m-none-eabi/include/c++/8.2.1/.keep
    A clang/test/Driver/Inputs/basic_arm_gcc_tree/armv6m-none-eabi/lib/.keep
    A clang/test/Driver/Inputs/basic_arm_gcc_tree/armv6m-none-eabi/lib/crt0.o
    A clang/test/Driver/Inputs/basic_arm_gcc_tree/bin/armv6m-none-eabi-ld
    A clang/test/Driver/Inputs/basic_arm_gcc_tree/lib/gcc/armv6m-none-eabi/8.2.1/crtbegin.o
    A clang/test/Driver/Inputs/basic_arm_gcc_tree/lib/gcc/armv6m-none-eabi/8.2.1/crtend.o
    A clang/test/Driver/Inputs/basic_arm_nogcc_tree/armv6m-none-eabi/lib/crt0.o
    A clang/test/Driver/Inputs/basic_arm_nogcc_tree/armv6m-none-eabi/lib/crtbegin.o
    A clang/test/Driver/Inputs/basic_arm_nogcc_tree/armv6m-none-eabi/lib/crtend.o
    A clang/test/Driver/Inputs/basic_arm_nogcc_tree/bin/armv6m-none-eabi-ld
    A clang/test/Driver/aarch64-gnutools.c
    A clang/test/Driver/aarch64-toolchain-extra.c
    A clang/test/Driver/aarch64-toolchain.c
    A clang/test/Driver/arm-gnutools.c
    A clang/test/Driver/arm-toolchain-extra.c
    A clang/test/Driver/arm-toolchain.c
    M clang/test/Driver/baremetal.cpp
    A clang/test/Driver/check-no-multlib-warning.c

  Log Message:
  -----------
  [Driver] Add support for GCC installation detection in Baremetal toolchain (#121829)

This patch introduces enhancements to the Baremetal toolchain to support
GCC toolchain detection.
- If the --gcc-install-dir or --gcc-toolchain options are provided and
point to valid paths, the sysroot is derived from those locations.
- If not, the logic falls back to the existing sysroot inference
mechanism already present in the Baremetal toolchain.
- Support for adding include paths for the libstdc++ library has also
been added.

Additionally, the restriction to always use the integrated assembler has
been removed. With a valid GCC installation, the GNU assembler can now
be used as well.

This patch currently updates and adds tests for the ARM target only.
RISC-V-specific tests will be introduced in a later patch, once the
RISCVToolChain is fully merged into the Baremetal toolchain. At this
stage, there is no way to test the RISC-V target within this PR.

RFC:
https://discourse.llvm.org/t/merging-riscvtoolchain-and-baremetal-toolchains/75524



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