use crate::spec::{LinkerFlavor, Target, TargetOptions, TargetResult};

// This target is for musl Linux on ARMv7 with thumb mode enabled
// (for consistency with Android and Debian-based distributions)
// and with NEON unconditionally enabled and, therefore, with 32 FPU
// registers enabled as well. See section A2.6.2 on page A2-56 in
// https://static.docs.arm.com/ddi0406/cd/DDI0406C_d_armv7ar_arm.pdf

pub fn target() -> TargetResult {
    let base = super::linux_musl_base::opts();
    Ok(Target {
        // It's important we use "gnueabihf" and not "musleabihf" here. LLVM
        // uses it to determine the calling convention and float ABI, and LLVM
        // doesn't support the "musleabihf" value.
        llvm_target: "armv7-unknown-linux-gnueabihf".to_string(),
        target_endian: "little".to_string(),
        target_pointer_width: "32".to_string(),
        target_c_int_width: "32".to_string(),
        data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
        arch: "arm".to_string(),
        target_os: "linux".to_string(),
        target_env: "musl".to_string(),
        target_vendor: "unknown".to_string(),
        linker_flavor: LinkerFlavor::Gcc,

        // Most of these settings are copied from the thumbv7neon_unknown_linux_gnueabihf
        // target.
        options: TargetOptions {
            features: "+v7,+thumb-mode,+thumb2,+vfp3,+neon".to_string(),
            cpu: "generic".to_string(),
            max_atomic_width: Some(64),
            unsupported_abis: super::arm_base::unsupported_abis(),
            target_mcount: "\u{1}mcount".to_string(),
            ..base
        },
    })
}
