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Toolchain: Add support for building the userland with the mold linker
This commit adds support for building the SerenityOS userland with the new [mold linker]. This is not enabled by default yet; to link using mold, run the `Toolchain/BuildMold.sh` script to build the latest release of mold, and set the `ENABLE_MOLD_LINKER` CMake variable to ON. This option relies on toolchain support that has been added just recently, so you might need to rebuild your toolchain for mold to work. [mold linker]: https://github.com/rui314/mold
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@ -53,6 +53,7 @@ There are some optional features that can be enabled during compilation that are
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- `ENABLE_PCI_IDS_DOWNLOAD`: downloads the [`pci.ids` database](https://pci-ids.ucw.cz/) that contains information about PCI devices at build time, if not already present. Enabled by default.
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- `BUILD_LAGOM`: builds [Lagom](../Meta/Lagom/ReadMe.md), which makes various SerenityOS libraries and programs available on the host system.
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- `ENABLE_KERNEL_LTO`: builds the kernel with link-time optimization.
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- `ENABLE_MOLD_LINKER`: builds the userland with the [`mold` linker](https://github.com/rui314/mold). `mold` can be built by running `Toolchain/BuildMold.sh`.
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- `INCLUDE_WASM_SPEC_TESTS`: downloads and includes the WebAssembly spec testsuite tests. In order to use this option, you will need to install `prettier` and `wabt`. wabt version 1.0.23 or higher is required to pre-process the WebAssembly spec testsuite.
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- `SERENITY_TOOLCHAIN`: Specifies whether to use the established GNU toolchain, or the experimental Clang-based toolchain for building SerenityOS. See the [Clang-based toolchain](#clang-based-toolchain) section below.
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- `SERENITY_ARCH`: Specifies which architecture to build for. Currently supported options are `i686` and `x86_64`. `x86_64` requires a separate toolchain build from `i686`.
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