From fc0f11e3d533fadbb7d2330b3d3b50bd4eae298e Mon Sep 17 00:00:00 2001
From: Gabriel Ebner <gebner@gebner.org>
Date: Sat, 29 Aug 2020 13:28:02 +0200
Subject: [PATCH] emscripten: make emconfigure use wrapped binaries

---
 pkgs/development/compilers/emscripten/default.nix | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/compilers/emscripten/default.nix b/pkgs/development/compilers/emscripten/default.nix
index ca355ce4fe65..0b43017aa120 100644
--- a/pkgs/development/compilers/emscripten/default.nix
+++ b/pkgs/development/compilers/emscripten/default.nix
@@ -33,8 +33,6 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [ nodejs python3 ];
 
-  outputs = [ "out" "appdir" ];
-
   buildPhase = ''
     patchShebangs .
 
@@ -57,10 +55,17 @@ stdenv.mkDerivation rec {
     # to make the test(s) below work
     # echo "SPIDERMONKEY_ENGINE = []" >> .emscripten
     echo "BINARYEN_ROOT = '${binaryen}'" >> .emscripten
+
+    # make emconfigure/emcmake use the correct (wrapped) binaries
+    sed -i "s|^EMCC =.*|EMCC='$out/bin/emcc'|" tools/shared.py
+    sed -i "s|^EMXX =.*|EMXX='$out/bin/em++'|" tools/shared.py
+    sed -i "s|^EMAR =.*|EMAR='$out/bin/emar'|" tools/shared.py
+    sed -i "s|^EMRANLIB =.*|EMRANLIB='$out/bin/emranlib'|" tools/shared.py
   '';
 
   installPhase = ''
-    rm -rf cache
+    appdir=$out/share/emscripten
+    mkdir -p $appdir
     cp -r . $appdir
     chmod -R +w $appdir