Add linker tools

[abeimler]

Tasks

• lld can be easily added as it is already supported. We just need to add a CLI and actions option for it. It should be treated the same as clangtidy, etc.
• mold
• sold
• gold

Description

Hi,
I was using setup-cpp with project_options (in my docker build) and custemize the linker option, see find_linker.

Would be nice to install mold or one of the other (better) Linker, rather then (gcc) ld or gold.

Improving C++ Compilation Times: Tools & Techniques - Vittorio Romeo - ACCU 2023

So install (?) ...

• mold (e.g. when compiler is gcc)
• lld when compiler is llvm (default)
• sold for Mac OS
• windows: ???

npx setup-cpp --compiler gcc --linker mold --cmake true --ninja true --ccache true --vcpkg true

---

More Context

I was getting this Error: /usr/bin/ld.gold: separate-code: unknown -z option.

CMakeOptions.cmake

find_linker(PROJECT_OPTIONS_LINKER)
MESSAGE(STATUS "Use Linker: ${PROJECT_OPTIONS_LINKER}")

project_options(
  ...
  LINKER
  ${PROJECT_OPTIONS_LINKER})

Compiler found: /usr/bin/g++-13
Use Linker: gold

After that I just installed mold and everything works:

RUN apt-get update -qq && \
    # install nodejs
    apt-get install -y --no-install-recommends nodejs npm && \
    # install setup-cpp
    npm install -g setup-cpp@v0.41.0 && \
    # install the compiler and tools
    setup-cpp \
        --nala true \
        --compiler ${compiler} \
        --cmake true \
        --ninja true \
        --task true \
        --vcpkg true \
        --cppcheck true \
        --gcovr true \
        --doxygen true \
        --ccache true && \
    # install custom linker
    apt-get install -y --no-install-recommends mold && \
    # cleanup
    nala autoremove -y && \
    nala autopurge -y && \
    apt-get clean && \
    nala clean --lists && \
    rm -rf /var/lib/apt/lists/* && \
    rm -rf /tmp/*

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