Fix: select generic ARM/AArch64 LibC (#4167)

ysbaddaden · web-flow · commit 874eb8b47179 · 2017-03-23T10:54:04.000+01:00
Fixes the target triple used by Crystal to select the LibC bindings when the triple specifies a specific ARM architecture, e.g. `armv6`, `armv7l` or `armv8.1-a`. refs #3424 (comment)
diff --git a/src/compiler/crystal/crystal_path.cr b/src/compiler/crystal/crystal_path.cr
@@ -20,8 +20,13 @@ module Crystal
       triple = target_triple.split('-')
       triple.delete(triple[1]) if triple.size == 4 # skip vendor
 
-      if %w(i386 i486 i586).includes?(triple[0])
+      case triple[0]
+      when "i386", "i486", "i586"
         triple[0] = "i686"
+      when .starts_with?("armv8")
+        triple[0] = "aarch64"
+      when .starts_with?("arm")
+        triple[0] = "arm"
       end
 
       target = if triple.any?(&.includes?("macosx")) || triple.any?(&.includes?("darwin"))
