src/test/run-make-fulldeps/target-specs/my-x86_64-unknown-linux-gnu-platform.json

{
    "pre-link-args": {"gcc": ["-m64"]},
    "data-layout": "e-m:e-i64:64-f80:128-n8:16:32:64-S128",
    "linker-flavor": "gcc",
    "llvm-target": "x86_64-unknown-linux-gnu",
    "target-endian": "little",
    "target-pointer-width": "64",
    "target-c-int-width": "32",
    "arch": "x86_64",
    "os": "linux",
    "morestack": false
}