systems: Allow detection of powerpc and sparc

lib/systems/inspect.nix

@@ -16,6 +16,7 @@ rec {
     isAarch64      = { cpu = { family = "arm"; bits = 64; }; };
     isMips         = { cpu = { family = "mips"; }; };
     isRiscV        = { cpu = { family = "riscv"; }; };
+    isSparc        = { cpu = { family = "sparc"; }; };
     isWasm         = { cpu = { family = "wasm"; }; };
 
     is32bit        = { cpu = { bits = 32; }; };

lib/systems/parse.nix

@@ -93,6 +93,9 @@ rec {
     riscv32  = { bits = 32; significantByte = littleEndian; family = "riscv"; };
     riscv64  = { bits = 64; significantByte = littleEndian; family = "riscv"; };
 
+    sparc    = { bits = 32; significantByte = bigEndian;    family = "sparc"; };
+    sparc64  = { bits = 64; significantByte = bigEndian;    family = "sparc"; };
+
     wasm32   = { bits = 32; significantByte = littleEndian; family = "wasm"; };
     wasm64   = { bits = 64; significantByte = littleEndian; family = "wasm"; };
   };

pkgs/build-support/bintools-wrapper/default.nix

@@ -185,6 +185,8 @@ stdenv.mkDerivation {
           "mips64"   = "btsmip";
           "mips64el" = "ltsmip";
         }.${targetPlatform.parsed.cpu.name}
+      else if targetPlatform.isPowerPC then "powerpc"
+      else if targetPlatform.isSparc then "sparc"
       else throw "unknown emulation for platform: " + targetPlatform.config;
     in targetPlatform.platform.bfdEmulation or (fmt + sep + arch);