freebsd: Handle MACHINE/MACHINE_ARCH/MACHINE_CPUARCH differences

pkgs/os-specific/bsd/freebsd/lib/default.nix

···
     stdenv':
     {
       x86_64 = "amd64";
+      aarch64 = "aarch64";
+      i486 = "i386";
+      i586 = "i386";
+      i686 = "i386";
+      armv6l = "armv6";
+      armv7l = "armv7";
+      powerpc = "powerpc";
+      powerpc64 = "powerpc64";
+      powerpc64le = "powerpc64le";
+      riscv64 = "riscv64";
+    }
+    .${stdenv'.hostPlatform.parsed.cpu.name} or stdenv'.hostPlatform.parsed.cpu.name;
+
+  mkBsdCpuArch =
+    stdenv':
+    {
+      x86_64 = "amd64";
+      aarch64 = "aarch64";
+      i486 = "i386";
+      i586 = "i386";
+      i686 = "i386";
+      armv6l = "arm";
+      armv7l = "arm";
+      powerpc = "powerpc";
+      powerpc64 = "powerpc";
+      powerpc64le = "powerpc";
+      riscv64 = "riscv";
+    }
+    .${stdenv'.hostPlatform.parsed.cpu.name} or stdenv'.hostPlatform.parsed.cpu.name;
+
+  mkBsdMachine =
+    stdenv':
+    {
+      x86_64 = "amd64";
       aarch64 = "arm64";
       i486 = "i386";
       i586 = "i386";
       i686 = "i386";
+      armv6l = "arm";
+      armv7l = "arm";
+      powerpc = "powerpc";
+      powerpc64 = "powerpc";
+      powerpc64le = "powerpc";
+      riscv64 = "riscv";
     }
     .${stdenv'.hostPlatform.parsed.cpu.name} or stdenv'.hostPlatform.parsed.cpu.name;
 

pkgs/os-specific/bsd/freebsd/pkgs/compat/package.nix

···
 }:
 
 let
-  inherit (freebsd-lib) mkBsdArch;
+  inherit (freebsd-lib) mkBsdMachine;
 in
 
 mkDerivation {
···
       "sys/sys/elf64.h"
       "sys/sys/elf_common.h"
       "sys/sys/elf_generic.h"
-      "sys/${mkBsdArch stdenv}/include"
+      "sys/${mkBsdMachine stdenv}/include"
     ]
     ++ lib.optionals stdenv.hostPlatform.isx86 [ "sys/x86/include" ]
     ++ [
···
     ''
       NIX_CFLAGS_COMPILE+=' -I../../include -I../../sys'
 
-      cp ../../sys/${mkBsdArch stdenv}/include/elf.h ../../sys/sys
-      cp ../../sys/${mkBsdArch stdenv}/include/elf.h ../../sys/sys/${mkBsdArch stdenv}
+      cp ../../sys/${mkBsdMachine stdenv}/include/elf.h ../../sys/sys
+      cp ../../sys/${mkBsdMachine stdenv}/include/elf.h ../../sys/sys/${mkBsdMachine stdenv}
     ''
     + lib.optionalString stdenv.hostPlatform.isx86 ''
       cp ../../sys/x86/include/elf.h ../../sys/x86

pkgs/os-specific/bsd/freebsd/pkgs/mkDerivation.nix

···
       # amd64 not x86_64 for this on unlike NetBSD
       MACHINE_ARCH = freebsd-lib.mkBsdArch stdenv';
 
-      MACHINE = freebsd-lib.mkBsdArch stdenv';
+      MACHINE = freebsd-lib.mkBsdMachine stdenv';
 
-      MACHINE_CPUARCH = MACHINE_ARCH;
+      MACHINE_CPUARCH = freebsd-lib.mkBsdCpuArch stdenv';
 
       COMPONENT_PATH = attrs.path or null;