The end of the GNU toolchain is getting close:
github.com/GrapheneOS/ker
github.com/GrapheneOS/ker
GNU tools are almost completely purged from the Android Open Source Project other than GNU assembler still being needed for Linux. Maybe LLVM assembler will be usable next generation.
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It's a huge usability / portability improvement because LLVM uses a single toolchain to target every platform. It doesn't make you use a separate toolchain to target different operating systems and architectures. No longer have all the nonsense toolchains for each target triple.
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Clang uses the LLVM integrated assembler by default so the Linux kernel build system currently disables it by default.
Setting LLVM=1 uses LLVM for everything else and LLVM_IAS=1 is needed to use the integrated assembler. Once it works properly, it will become the default.
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GNU assembler, the only part of the GNU toolchain that's still needed to build the Linux kernel for the Pixel 4 (5G), Pixel 5 and later.
LLVM integrated assembler is already being used for everything else. Should be ready for usage for the Linux kernel soon, at least on arm64.