From aaca0d1c927913dbdb613bd8f16179ae8312facf Mon Sep 17 00:00:00 2001
From: Michael Eden <themichaeleden@gmail.com>
Date: Sat, 30 Mar 2019 22:45:32 -0400
Subject: [PATCH] gcc: put target-specific libs in lib output

---
 pkgs/development/compilers/gcc/7/default.nix |  3 +++
 pkgs/development/compilers/gcc/builder.sh    | 15 ++++++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/compilers/gcc/7/default.nix b/pkgs/development/compilers/gcc/7/default.nix
index 68c05d289784a..3124b07367783 100644
--- a/pkgs/development/compilers/gcc/7/default.nix
+++ b/pkgs/development/compilers/gcc/7/default.nix
@@ -152,6 +152,9 @@ stdenv.mkDerivation ({
 
   libc_dev = stdenv.cc.libc_dev;
 
+  # set this var to use in builder.sh
+  target_triple = targetPlatform.config;
+
   hardeningDisable = [ "format" "pie" ];
 
   # This should kill all the stdinc frameworks that gcc and friends like to
diff --git a/pkgs/development/compilers/gcc/builder.sh b/pkgs/development/compilers/gcc/builder.sh
index 07a003691d6b2..fb79a4ef9531e 100644
--- a/pkgs/development/compilers/gcc/builder.sh
+++ b/pkgs/development/compilers/gcc/builder.sh
@@ -213,9 +213,18 @@ preInstall() {
 
 postInstall() {
     # Move runtime libraries to $lib.
-    moveToOutput "lib/lib*.so*" "$lib"
-    moveToOutput "lib/lib*.la"  "$lib"
-    moveToOutput "lib/lib*.dylib" "$lib"
+    if [[ -d "$out/$target_triple/lib" ]]; then
+        moveToOutput "$target_triple/lib/lib*.so*" "$lib"
+        moveToOutput "$target_triple/lib/lib*.la" "$lib"
+        moveToOutput "$target_triple/lib/lib*.dylib" "$lib"
+        mv "$lib/$target_triple"/lib/* "$lib/lib/"
+        rmdir -p --ignore-fail-on-non-empty "$lib/$target_triple/lib" || :
+    else
+        moveToOutput "lib/lib*.so*" "$lib"
+        moveToOutput "lib/lib*.la"  "$lib"
+        moveToOutput "lib/lib*.dylib" "$lib"
+    fi
+
     moveToOutput "share/gcc-*/python" "$lib"
 
     for i in "$lib"/lib/*.{la,py}; do