bcc: move from linux-kernels packages to normal packages

bcc doesn't really need kernel itself, it just cares about module path.

It's actually better to use /run/booted-system/kernel-modules/lib/modules
for two reasons:
 - no need to rebuild bcc for each new kernel
 - can use a newer bcc with a booted kernel that doesn't match the current
   system

nixos/modules/programs/bcc.nix

@@ -1,9 +1,9 @@
-{ config, lib, ... }:
+{ config, pkgs, lib, ... }:
 {
   options.programs.bcc.enable = lib.mkEnableOption "bcc";
 
   config = lib.mkIf config.programs.bcc.enable {
-    environment.systemPackages = [ config.boot.kernelPackages.bcc ];
-    boot.extraModulePackages = [ config.boot.kernelPackages.bcc ];
+    environment.systemPackages = [ pkgs.bcc ];
+    boot.extraModulePackages = [ pkgs.bcc ];
   };
 }

pkgs/os-specific/linux/bcc/default.nix

@@ -1,7 +1,7 @@
 { lib, stdenv, fetchFromGitHub
-, makeWrapper, cmake, llvmPackages, kernel
+, makeWrapper, cmake, llvmPackages
 , flex, bison, elfutils, python, luajit, netperf, iperf, libelf
-, systemtap, bash
+, bash
 }:
 
 python.pkgs.buildPythonApplication rec {
@@ -20,9 +20,9 @@ python.pkgs.buildPythonApplication rec {
   format = "other";
 
   buildInputs = with llvmPackages; [
-    llvm llvm.dev libclang kernel
+    llvm llvm.dev libclang
     elfutils luajit netperf iperf
-    systemtap.stapBuild flex bash
+    flex bash
   ];
 
   patches = [
@@ -32,12 +32,10 @@ python.pkgs.buildPythonApplication rec {
   ];
 
   propagatedBuildInputs = [ python.pkgs.netaddr ];
-  nativeBuildInputs = [ makeWrapper cmake flex bison llvmPackages.llvm.dev ]
-    # libelf is incompatible with elfutils-libelf
-    ++ lib.filter (x: x != libelf) kernel.moduleBuildDependencies;
+  nativeBuildInputs = [ makeWrapper cmake flex bison llvmPackages.llvm.dev ];
 
   cmakeFlags = [
-    "-DBCC_KERNEL_MODULES_DIR=${kernel.dev}/lib/modules"
+    "-DBCC_KERNEL_MODULES_DIR=/run/booted-system/kernel-modules/lib/modules"
     "-DREVISION=${version}"
     "-DENABLE_USDT=ON"
     "-DENABLE_CPP_API=ON"

pkgs/top-level/all-packages.nix

@@ -14149,6 +14149,10 @@ with pkgs;
 
   bpftools = callPackage ../os-specific/linux/bpftools { };
 
+  bcc = callPackage ../os-specific/linux/bcc {
+    python = pkgs.python3;
+  };
+
   bpm-tools = callPackage ../tools/audio/bpm-tools { };
 
   byacc = callPackage ../development/tools/parsing/byacc { };

pkgs/top-level/linux-kernels.nix

@@ -250,6 +250,7 @@ in {
     inherit (kernel) kernelOlder kernelAtLeast;
     # Obsolete aliases (these packages do not depend on the kernel).
     inherit (pkgs) odp-dpdk pktgen; # added 2018-05
+    inherit (pkgs) bcc; # added 2021-12
 
     acpi_call = callPackage ../os-specific/linux/acpi-call {};
 
@@ -263,10 +264,6 @@ in {
 
     batman_adv = callPackage ../os-specific/linux/batman-adv {};
 
-    bcc = callPackage ../os-specific/linux/bcc {
-      python = pkgs.python3;
-    };
-
     bpftrace = callPackage ../os-specific/linux/bpftrace { };
 
     bbswitch = callPackage ../os-specific/linux/bbswitch {};