Clean up paraver derivations

Currently, we can use bscpkgs similarly to nixpkgs either through
the flake outputs or with import bscpkgs:

```nix
# currently supported:
bscpkgs.legacyPackages.x86_64-linux.hello
let pkgs = import bscpkgs { system = "x86_64-linux"; }; in pkgs.hello
```
The missing piece is nixpkgs.lib (not pkgs.lib, the system agnostic
one). The workaround is to do bscpkgs.inputs.nixpkgs.lib instead. We can
simplify this by forwarding the lib to our outputs.

This enables us to use bscpkgs as a drop-in
replacing the inputs to our flake from nixpkgs to bscpkgs.
(inputs.nixpkgs.url = "<*BSC*pkgs url>").


Reviewed-by: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>
Tested-by: Aleix Boné <abonerib@bsc.es>

flake.nix

@@ -13,5 +13,8 @@
       bscOverlay = import ./overlay.nix;
       overlays.default = self.bscOverlay;
       legacyPackages.x86_64-linux = pkgs;
+
+      # propagate nixpkgs lib, so we can do bscpkgs.lib
+      inherit (nixpkgs) lib;
     };
 }

pkgs/paraver/default.nix

@@ -1,5 +1,4 @@
-{
-  stdenv
+{ stdenv
 , fetchFromGitHub
 , autoreconfHook
 , boost
@@ -12,14 +11,17 @@
 , openssl
 , glibcLocales
 , wrapGAppsHook
+
+, enableDebug ? false
 }:
 
 let
   wx = wxGTK32;
-in
-stdenv.mkDerivation rec {
-  pname = "wxparaver";
   version = "4.12.0";
+in
+stdenv.mkDerivation {
+  pname = "wxparaver";
+  inherit version;
 
   src = fetchFromGitHub {
     owner = "bsc-performance-tools";
@@ -36,21 +38,26 @@ stdenv.mkDerivation rec {
     ./fix-boost-87.patch
   ];
 
-  hardeningDisable = [ "all" ];
-
   # Fix the PARAVER_HOME variable
   postPatch = ''
     sed -i 's@^PARAVER_HOME=.*$@PARAVER_HOME='$out'@g' docs/wxparaver
     sed -i '1aexport LOCALE_ARCHIVE="${glibcLocales}/lib/locale/locale-archive"' docs/wxparaver
   '';
 
-  dontStrip = true;
   enableParallelBuilding = true;
 
-  preConfigure = ''
-    export CFLAGS="-O3"
-    export CXXFLAGS="-O3"
-  '';
+  hardeningDisable = [ "all" ];
+
+  dontStrip = true;
+
+  env =
+    let
+      flags = if enableDebug then "-ggdb -Og" else "-O3";
+    in
+    {
+      CFLAGS = flags;
+      CXXFLAGS = flags;
+    };
 
   configureFlags = [
     "--with-boost=${boost}"
@@ -60,19 +67,19 @@ stdenv.mkDerivation rec {
   ];
 
   nativeBuildInputs = [
+    autoconf
+    automake
+    autoreconfHook
     wrapGAppsHook
   ];
 
   buildInputs = [
-    autoreconfHook
     boost
-    libxml2.dev
+    libxml2
     xml2
     wx
-    autoconf
-    automake
     paraverKernel
-    openssl.dev
+    openssl
   ];
 
   postInstall = ''

pkgs/paraver/kernel.nix

@@ -1,5 +1,4 @@
-{
-  stdenv
+{ stdenv
 , fetchFromGitHub
 , autoreconfHook
 , boost
@@ -9,11 +8,16 @@
 , automake
 , pkg-config
 , zlib
+
+, enableDebug ? false
 }:
 
-stdenv.mkDerivation rec {
-  pname = "paraver-kernel";
+let
   version = "4.12.0";
+in
+stdenv.mkDerivation {
+  pname = "paraver-kernel";
+  inherit version;
 
   src = fetchFromGitHub {
     owner = "bsc-performance-tools";
@@ -34,24 +38,31 @@ stdenv.mkDerivation rec {
 
   dontStrip = true;
 
-  preConfigure = ''
-    export CFLAGS="-O3 -DPARALLEL_ENABLED"
-    export CXXFLAGS="-O3 -DPARALLEL_ENABLED"
-  '';
+  env =
+    let
+      flags = "-DPARALLEL_ENABLED " + (if enableDebug then "-ggdb -Og" else "-O3");
+    in
+    {
+      CFLAGS = flags;
+      CXXFLAGS = flags;
+    };
 
   configureFlags = [
     "--with-boost=${boost}"
     "--enable-openmp"
   ];
 
-  buildInputs = [
+  nativeBuildInputs = [
     autoreconfHook
-    boost
-    libxml2.dev
-    xml2
     autoconf
     automake
     pkg-config
+  ];
+
+  buildInputs = [
+    boost
+    libxml2.dev
+    xml2
     zlib
   ];
 }

pkgs/paraver/release.nix

@@ -61,13 +61,16 @@ stdenv.mkDerivation rec {
     "--with-wx-config=${wx}/bin/wx-config"
   ];
 
+  nativeBuildInputs = [
+    autoconf
+    automake
+  ];
+
   buildInputs = [
     boost
     xml2
     libxml2.dev
     wx
-    autoconf
-    automake
     openssl.dev
   ];