Fully document all the riscv64 flags.

var (

	riscv64Cflags = []string{

		// Help catch common 32/64-bit errors.

		// Help catch common 32/64-bit errors. (This is duplicated in all 64-bit

		// architectures' cflags.)

		"-Werror=implicit-function-declaration",

		// This is already the driver's Android default, but duplicated here (and

		// below) for ease of experimentation with additional extensions.

		"-march=rv64gcv_zba_zbb_zbs",

		// TODO: move to driver (https://github.com/google/android-riscv64/issues/111)

		"-munaligned-access",

		// Until https://gitlab.com/qemu-project/qemu/-/issues/1976 is fixed...

		// TODO: remove when qemu V works (https://gitlab.com/qemu-project/qemu/-/issues/1976)

		// (Note that we'll probably want to wait for berberis to be good enough

		// that most people don't care about qemu's V performance either!)

		"-mno-implicit-float",

		// (https://github.com/google/android-riscv64/issues/124)

		// TODO: remove when clang default changed (https://github.com/google/android-riscv64/issues/124)

		"-mllvm -jump-is-expensive=false",

	}

	riscv64ArchVariantCflags = map[string][]string{}

	riscv64Ldflags = []string{

		// TODO: sysv hashes are the default for other architectures because gnu

		// hashes weren't supported until api level 23, but riscv64 didn't exist

		// back then, and could move today...

		// https://android.googlesource.com/platform/bionic/+/main/android-changes-for-ndk-developers.md#gnu-hashes-availible-in-api-level-23

		"-Wl,--hash-style=gnu",

		// This is already the driver's Android default, but duplicated here (and

		// above) for ease of experimentation with additional extensions.

		"-march=rv64gcv_zba_zbb_zbs",

		// TODO: move to driver (https://github.com/google/android-riscv64/issues/111)

		"-munaligned-access",

		// We should change the default for this in clang, but for now...

		// (https://github.com/google/android-riscv64/issues/124)

		// TODO: remove when clang default changed (https://github.com/google/android-riscv64/issues/124)

		"-Wl,-mllvm -Wl,-jump-is-expensive=false",

	}