Distinguish pkgsStatic from pkgsMusl via stdenv.targetPlatform

This change allows derivations to distinguish dynamic musl build and static musl build in cases where upstream build system can't detect it by itself.
NixOS · Aug 27, 2020 · 5519511 · 5519511
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commit 5519511
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diff --git a/lib/systems/default.nix b/lib/systems/default.nix
@@ -76,6 +76,7 @@ rec {
          # uname -r
          release = null;
       };
+      isStatic = final.isWasm || final.isRedox;
 
       kernelArch =
         if final.isAarch32 then "arm"

diff --git a/pkgs/top-level/stage.nix b/pkgs/top-level/stage.nix
@@ -215,6 +215,7 @@ let
       crossOverlays = [ (import ./static.nix) ];
     } // lib.optionalAttrs stdenv.hostPlatform.isLinux {
       crossSystem = {
+        isStatic = true;
         parsed = stdenv.hostPlatform.parsed // {
           abi = {
             gnu = lib.systems.parse.abis.musl;