diff options
Diffstat (limited to 'library/compiler-builtins/libm/configure.rs')
| -rw-r--r-- | library/compiler-builtins/libm/configure.rs | 30 |
1 files changed, 6 insertions, 24 deletions
diff --git a/library/compiler-builtins/libm/configure.rs b/library/compiler-builtins/libm/configure.rs index f9100d2d58b..76186e63652 100644 --- a/library/compiler-builtins/libm/configure.rs +++ b/library/compiler-builtins/libm/configure.rs @@ -1,9 +1,9 @@ // Configuration shared with both libm and libm-test +use std::env; use std::path::PathBuf; -use std::process::{Command, Stdio}; -use std::{env, str}; +#[derive(Debug)] #[allow(dead_code)] pub struct Config { pub manifest_dir: PathBuf, @@ -33,26 +33,6 @@ impl Config { .map(|s| s.to_lowercase().replace("_", "-")) .collect(); - // Query rustc for options that Cargo does not provide env for. The bootstrap hack is used - // to get consistent output regardless of channel (`f16`/`f128` config options are hidden - // on stable otherwise). - let mut cmd = Command::new(env::var("RUSTC").unwrap()); - cmd.args(["--print=cfg", "--target", &target_triple]) - .env("RUSTC_BOOTSTRAP", "1") - .stderr(Stdio::inherit()); - let out = cmd - .output() - .unwrap_or_else(|e| panic!("failed to run `{cmd:?}`: {e}")); - let rustc_cfg = str::from_utf8(&out.stdout).unwrap(); - - // If we couldn't query `rustc` (e.g. a custom JSON target was used), make the safe - // choice and leave `f16` and `f128` disabled. - let rustc_output_ok = out.status.success(); - let reliable_f128 = - rustc_output_ok && rustc_cfg.lines().any(|l| l == "target_has_reliable_f128"); - let reliable_f16 = - rustc_output_ok && rustc_cfg.lines().any(|l| l == "target_has_reliable_f16"); - Self { target_triple, manifest_dir: PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap()), @@ -66,8 +46,10 @@ impl Config { target_string: env::var("TARGET").unwrap(), target_vendor: env::var("CARGO_CFG_TARGET_VENDOR").unwrap(), target_features, - reliable_f128, - reliable_f16, + // Note that these are unstable options, so only show up with the nightly compiler or + // with `RUSTC_BOOTSTRAP=1` (which is required to use the types anyway). + reliable_f128: env::var_os("CARGO_CFG_TARGET_HAS_RELIABLE_F128").is_some(), + reliable_f16: env::var_os("CARGO_CFG_TARGET_HAS_RELIABLE_F16").is_some(), } } } |