Fixes #13: Enable conditional compilation of ISAs through features;

cranelift/codegen/meta/src/lib.rs

@@ -13,43 +13,8 @@ mod shared;
 mod srcgen;
 mod unique_table;
 
-pub fn isa_from_arch(arch: &str) -> Result<Vec<isa::Isa>, String> {
-    isa::Isa::from_arch(arch)
-        .ok_or_else(|| format!("no supported isa found for arch `{}`", arch))
-        .and_then(|isa| Ok(vec![isa]))
-}
-
-pub fn isas_from_targets(targets: Vec<&str>) -> Result<Vec<isa::Isa>, String> {
-    type R<'a> = Vec<(&'a str, Option<isa::Isa>)>;
-
-    let (known, unknown): (R, R) = targets
-        .into_iter()
-        .map(|target| (target, isa::Isa::from_name(target)))
-        .partition(|(_, opt_isa)| opt_isa.is_some());
-
-    if !unknown.is_empty() {
-        let unknown_targets = unknown
-            .into_iter()
-            .map(|(target, _)| target)
-            .collect::<Vec<_>>()
-            .join(", ");
-        return Err(format!("unknown isa targets: {}", unknown_targets));
-    }
-
-    let isas = if known.is_empty() {
-        isa::Isa::all().to_vec()
-    } else {
-        known
-            .into_iter()
-            .map(|(_, opt_isa)| opt_isa.unwrap())
-            .collect()
-    };
-
-    Ok(isas)
-}
-
-pub fn all_isas() -> Result<Vec<isa::Isa>, String> {
-    isas_from_targets(vec![])
+pub fn isa_from_arch(arch: &str) -> Result<isa::Isa, String> {
+    isa::Isa::from_arch(arch).ok_or_else(|| format!("no supported isa found for arch `{}`", arch))
 }
 
 /// Generates all the Rust source files used in Cranelift from the meta-language.