per-system-optim/nixpkgs/nixpkgs.patch

diff --git a/lib/systems/architectures.nix b/lib/systems/architectures.nix
index 9be8c80e3f11..0d1e4c6dfb05 100644
--- a/lib/systems/architectures.nix
+++ b/lib/systems/architectures.nix
@@ -41,9 +41,25 @@ rec {
     armv5te        = [ ];
     armv6          = [ ];
     armv7-a        = [ ];
-    armv8-a        = [ ];
+    armv8-a        = [ "fp" "simd" ];
+    "armv8.1-a"    = [ "crc" "lse" "rdma" ] ++ features.armv8-a;
+    "armv8.2-a"    = features."armv8.1-a";
+    "armv8.3-a"    = [ "pauth" ] ++ features."armv8.2-a";
+    "armv8.4-a"    = [ "flagm" "fp16fml" "dotprod" ] ++ features."armv8.3-a";
+    "armv8.5-a"    = [ "sb" "sbss" "predres" ] ++ features."armv8.4-a";
+    "armv8.6-a"    = [ "bf16" "i8mm" ] ++ features."armv8.5-a";
+    "armv8.7-a"    = [ "ls64" ] ++ features."armv8.6-a";
+    "armv8.8-a"    = [ "mops" ] ++ features."armv8.7-a";
+    "armv9-a"      = [ "sve" "sve2" ] ++ features."armv8.5-a";
+    "armv9.1-a"    = [ "bf16" "i8mm" ] ++ features."armv9-a";
+    "armv9.2-a"    = [ "ls64" ] ++ features."armv9.1-a";
+    "armv9.3-a"    = [ "mops" ] ++ features."armv9.2-a";
     mips32         = [ ];
     loongson2f     = [ ];
+    rv64gc = [];
+    rv64gc_zba = [];
+    rv64gc_zbb = [];
+    rv64gc_zba_zbb = [];
   };
 
   # a superior CPU has all the features of an inferior and is able to build and test code for it
@@ -114,8 +130,24 @@ rec {
     armv6          = [ ];
     armv7-a        = [ ];
     armv8-a        = [ ];
+    "armv8.1-a"    = [ "armv8-a" ] ++ inferiors.armv8-a;
+    "armv8.2-a"    = [ "armv8.1-a" ] ++ inferiors."armv8.1-a";
+    "armv8.3-a"    = [ "armv8.2-a" ] ++ inferiors."armv8.2-a";
+    "armv8.4-a"    = [ "armv8.3-a" ] ++ inferiors."armv8.3-a";
+    "armv8.5-a"    = [ "armv8.4-a" ] ++ inferiors."armv8.4-a";
+    "armv8.6-a"    = [ "armv8.5-a" ] ++ inferiors."armv8.5-a";
+    "armv8.7-a"    = [ "armv8.6-a" ] ++ inferiors."armv8.6-a";
+    "armv8.8-a"    = [ "armv8.7-a" ] ++ inferiors."armv8.7-a";
+    "armv9-a"      = [ "armv8.5-a" ] ++ inferiors."armv8.5-a";
+    "armv9.1-a"    = [ "armv9-a" "armv8.6-a" ] ++ inferiors."armv9-a" ++ inferiors."armv8.6-a";
+    "armv9.2-a"    = [ "armv9.1-a" "armv8.7-a" ] ++ inferiors."armv9.1-a" ++ inferiors."armv8.7-a";
+    "armv9.3-a"    = [ "armv9.2-a" "armv8.8-a" ] ++ inferiors."armv9.2-a" ++ inferiors."armv8.8-a";
     mips32         = [ ];
     loongson2f     = [ ];
+    rv64gc      = [ ];
+    rv64gc_zba     = [ "rv64gc" ] ++ inferiors.rv64gc;
+    rv64gc_zbb     = [ "rv64gc" ] ++ inferiors.rv64gc;
+    rv64gc_zba_zbb = [ "rv64gc" "rv64gc_zba" "rv64gc_zbb" ];
   };
 
   predicates = let
diff --git a/pkgs/build-support/cc-wrapper/default.nix b/pkgs/build-support/cc-wrapper/default.nix
index db3efa068c0f..2e75895496a1 100644
--- a/pkgs/build-support/cc-wrapper/default.nix
+++ b/pkgs/build-support/cc-wrapper/default.nix
@@ -128,6 +128,9 @@ let
         znver2         = versionAtLeast ccVersion "9.0";
         znver3         = versionAtLeast ccVersion "11.0";
         znver4         = versionAtLeast ccVersion "13.0";
+
+        # Risc-V
+        rv64gc_zba_zbb = versionAtLeast ccVersion "11.0";
       }.${arch} or true
     else if isClang then
       { #Generic
@@ -147,6 +150,9 @@ let
         znver2         = versionAtLeast ccVersion "9.0";
         znver3         = versionAtLeast ccVersion "12.0";
         znver4         = versionAtLeast ccVersion "16.0";
+
+        # Risc-V
+        rv64gc_zba_zbb = versionAtLeast ccVersion "14.0";
       }.${arch} or true
     else
       false;
diff --git a/pkgs/stdenv/generic/make-derivation.nix b/pkgs/stdenv/generic/make-derivation.nix
index 745426915987..cf731b618f0c 100644
--- a/pkgs/stdenv/generic/make-derivation.nix
+++ b/pkgs/stdenv/generic/make-derivation.nix
@@ -166,10 +166,8 @@ let
 , ... } @ attrs:
 
 let
-  # TODO(@oxij, @Ericson2314): This is here to keep the old semantics, remove when
-  # no package has `doCheck = true`.
-  doCheck' = doCheck && stdenv.buildPlatform.canExecute stdenv.hostPlatform;
-  doInstallCheck' = doInstallCheck && stdenv.buildPlatform.canExecute stdenv.hostPlatform;
+  doCheck' = config.doCheckByDefault && stdenv.buildPlatform.canExecute stdenv.hostPlatform;
+  doInstallCheck' = config.doCheckByDefault && stdenv.buildPlatform.canExecute stdenv.hostPlatform;
 
   separateDebugInfo' = separateDebugInfo && stdenv.hostPlatform.isLinux;
   outputs' = outputs ++ lib.optional separateDebugInfo' "debug";
diff --git a/pkgs/top-level/impure.nix b/pkgs/top-level/impure.nix
index 4d847e280f4b..874b776c1e16 100644
--- a/pkgs/top-level/impure.nix
+++ b/pkgs/top-level/impure.nix
@@ -9,12 +9,15 @@ let
   # Return ‘x’ if it evaluates, or ‘def’ if it throws an exception.
   try = x: def: let res = builtins.tryEval x; in if res.success then res.value else def;
 
+  configuredLocalSystem = if builtins.pathExists "/etc/nix/local-system.json" then builtins.fromJSON (builtins.readFile "/etc/nix/local-system.json") else { system = builtins.currentSystem; };
+  localSystemOverriden = args: args ? system && (args.system != configuredLocalSystem);
+  defaultLocalSystem = args: if localSystemOverriden args then { system = args.system; } else configuredLocalSystem;
 in
 
 { # We put legacy `system` into `localSystem`, if `localSystem` was not passed.
   # If neither is passed, assume we are building packages on the current
   # (build, in GNU Autotools parlance) platform.
-  localSystem ? { system = args.system or builtins.currentSystem; }
+  localSystem ? null
 
 # These are needed only because nix's `--arg` command-line logic doesn't work
 # with unnamed parameters allowed by ...
@@ -78,6 +81,9 @@ in
 
 , ...
 } @ args:
+let
+  localSystem' = if localSystem == null then defaultLocalSystem args else localSystem;
+in
 
 # If `localSystem` was explicitly passed, legacy `system` should
 # not be passed, and vice-versa.
@@ -85,5 +91,6 @@ assert args ? localSystem -> !(args ? system);
 assert args ? system -> !(args ? localSystem);
 
 import ./. (builtins.removeAttrs args [ "system" ] // {
-  inherit config overlays localSystem;
+  inherit config overlays;
+  localSystem = localSystem';
 })