Default architecture 'auto', and name correctly the libraries ('-mt' suffix)

pkgs/amd_blis/default.nix

@@ -8,8 +8,9 @@
   # Enable BLAS interface with 64-bit integer width.
   blasIntSize ? "64",
 
-  # Target architecture. x86_64 builds Intel and AMD kernels.
-  withArchitecture ? "x86_64",
+  # Target architecture. "auto" lets the script decide for itself.
+  # For fox, "zen4" should be used.
+  withArchitecture ? "auto",
 
   # Enable OpenMP-based threading.
   withOpenMP ? true,
@@ -22,6 +23,8 @@
 
 assert lib.assertOneOf "blasIntSize" blasIntSize ["32" "64"];
 let
+  threadingSuffix = lib.optionalString withOpenMP "-mt";
+
   git = rec {
     version = src.shortRev;
     src = builtins.fetchGit {
@@ -49,15 +52,16 @@ in
       "--blas-int-size=${blasIntSize}"
       ]
       ++ lib.optionals withOpenMP [ "--enable-threading=openmp" ]
-      ++ [ "auto" ];
+      ++ [ withArchitecture ];
 
     postPatch = ''
       patchShebangs configure build/flatten-headers.py
     '';
 
     postInstall = ''
-      ln -s $out/lib/libblis.so.4 $out/lib/libblas.so.3
-      ln -s $out/lib/libblis.so.4 $out/lib/libcblas.so.3
+      ls $out/lib
+      ln -s $out/lib/libblis${threadingSuffix}.so $out/lib/libblas.so.3
+      ln -s $out/lib/libblis${threadingSuffix}.so $out/lib/libcblas.so.3
       ln -s $out/lib/libblas.so.3 $out/lib/libblas.so
       ln -s $out/lib/libcblas.so.3 $out/lib/libcblas.so
     '';