From c407873d50f7ec6aa643f3052475160068696b01 Mon Sep 17 00:00:00 2001
From: Adam Joseph <adam@westernsemico.com>
Date: Fri, 21 Apr 2023 11:04:48 -0700
Subject: [PATCH 1/2] qemu: allow to disable generation of documentation

I've been having trouble with some qemu builds since the v8.0.0 bump
failing with:

```
kernel-doc 'perl /build/qemu/docs/../scripts/kernel-doc -rst -enable-lineno -sphinx-version 5.3.0 -Werror /build/qemu/docs/../include/qemu/bitops.h' processing failed with: [Errno 2] No such file or directory: 'perl'
```

... this happens despite `perl` being part of `stdenv`.  Adding
`perl` to `nativeBuildInputs` doesn't seem to fix it.  It is handy
to be able to simply skip the docs in situations like this in order
to maintain forward progress, so this commit adds `enableDocs?true`
to allow that.
---
 pkgs/applications/virtualization/qemu/default.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkgs/applications/virtualization/qemu/default.nix b/pkgs/applications/virtualization/qemu/default.nix
index bef33e219b4d..0761d58c7265 100644
--- a/pkgs/applications/virtualization/qemu/default.nix
+++ b/pkgs/applications/virtualization/qemu/default.nix
@@ -27,6 +27,7 @@
 , tpmSupport ? true
 , uringSupport ? stdenv.isLinux, liburing
 , canokeySupport ? false, canokey-qemu
+, enableDocs ? true
 , hostCpuOnly ? false
 , hostCpuTargets ? (if hostCpuOnly
                     then (lib.optional stdenv.isx86_64 "i386-softmmu"
@@ -147,7 +148,7 @@ stdenv.mkDerivation rec {
 
   configureFlags = [
     "--disable-strip" # We'll strip ourselves after separating debug info.
-    "--enable-docs"
+    (lib.enableFeature enableDocs "docs")
     "--enable-tools"
     "--localstatedir=/var"
     "--sysconfdir=/etc"

From 06e8d82e9c74205ffa2fe4dda06c7430064243d2 Mon Sep 17 00:00:00 2001
From: Artturin <Artturin@artturin.com>
Date: Sat, 22 Apr 2023 00:38:56 +0300
Subject: [PATCH 2/2] lib/systems: disable docs in qemu-user

45M -> 31M
---
 lib/systems/default.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/systems/default.nix b/lib/systems/default.nix
index 7e6fa5ecfb4b..b2cb8848f08b 100644
--- a/lib/systems/default.nix
+++ b/lib/systems/default.nix
@@ -185,6 +185,7 @@ rec {
               pulseSupport = false;
               smbdSupport = false;
               seccompSupport = false;
+              enableDocs = false;
               hostCpuTargets = [ "${final.qemuArch}-linux-user" ];
             };
             wine = (pkgs.winePackagesFor "wine${toString final.parsed.cpu.bits}").minimal;