From dd584d8eeb8c76d82cbac50ace0f7a08586a31e9 Mon Sep 17 00:00:00 2001
From: Matthew Bauer <mjbauer95@gmail.com>
Date: Wed, 10 Apr 2019 18:38:20 -0400
Subject: [PATCH] stdenv/linux: use isCompatible to find bootstrap tools
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This avoids part of the issue where things like armv7a don’t work
because the system doesn’t realize it can use the armv7l bootstrap
tools.
---
 pkgs/stdenv/default.nix       |  6 ++++++
 pkgs/stdenv/linux/default.nix | 14 +++++++++++---
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/pkgs/stdenv/default.nix b/pkgs/stdenv/default.nix
index 4313a617f784..1f752f021524 100644
--- a/pkgs/stdenv/default.nix
+++ b/pkgs/stdenv/default.nix
@@ -43,8 +43,14 @@ in
     "x86_64-linux" = stagesLinux;
     "armv5tel-linux" = stagesLinux;
     "armv6l-linux" = stagesLinux;
+    "armv6m-linux" = stagesLinux;
     "armv7a-linux" = stagesLinux;
     "armv7l-linux" = stagesLinux;
+    "armv7r-linux" = stagesLinux;
+    "armv7m-linux" = stagesLinux;
+    "armv8a-linux" = stagesLinux;
+    "armv8r-linux" = stagesLinux;
+    "armv8m-linux" = stagesLinux;
     "aarch64-linux" = stagesLinux;
     "mipsel-linux" = stagesLinux;
     "powerpc-linux" = /* stagesLinux */ stagesNative;
diff --git a/pkgs/stdenv/linux/default.nix b/pkgs/stdenv/linux/default.nix
index 457e1671e260..2bccd620436a 100644
--- a/pkgs/stdenv/linux/default.nix
+++ b/pkgs/stdenv/linux/default.nix
@@ -13,7 +13,6 @@
       "x86_64-linux" = import ./bootstrap-files/x86_64.nix;
       "armv5tel-linux" = import ./bootstrap-files/armv5tel.nix;
       "armv6l-linux" = import ./bootstrap-files/armv6l.nix;
-      "armv7a-linux" = import ./bootstrap-files/armv7l.nix;
       "armv7l-linux" = import ./bootstrap-files/armv7l.nix;
       "aarch64-linux" = import ./bootstrap-files/aarch64.nix;
       "mipsel-linux" = import ./bootstrap-files/loongson2f.nix;
@@ -26,10 +25,19 @@
       "powerpc64le-linux" = import ./bootstrap-files/ppc64le-musl.nix;
     };
   };
+
+  # Try to find an architecture compatible with our current system. We
+  # just try every bootstrap we’ve got and test to see if it is
+  # compatible with or current architecture.
+  getCompatibleTools = lib.foldl (v: system:
+    if v != null then v
+    else if localSystem.isCompatible (lib.systems.elaborate { inherit system; }) then archLookupTable.${system}
+    else null) null (lib.attrNames archLookupTable);
+
   archLookupTable = table.${localSystem.libc}
     or (abort "unsupported libc for the pure Linux stdenv");
-  files = archLookupTable.${localSystem.system}
-    or (abort "unsupported platform for the pure Linux stdenv");
+  files = archLookupTable.${localSystem.system} or (if getCompatibleTools != null then getCompatibleTools
+    else (abort "unsupported platform for the pure Linux stdenv"));
   in files
 }: