diff --git a/pkgs/development/compilers/gcc/4.5/default.nix b/pkgs/development/compilers/gcc/4.5/default.nix
index 23dcacd837d..0d02d46d91b 100644
--- a/pkgs/development/compilers/gcc/4.5/default.nix
+++ b/pkgs/development/compilers/gcc/4.5/default.nix
@@ -233,8 +233,18 @@ stdenv.mkDerivation ({
   nativeBuildInputs = [ texinfo which gettext ]
     ++ optional (perl != null) perl;
 
-  buildInputs = [ gmp mpfr libmpc libelf ]
-    ++ (optional (ppl != null) ppl)
+  # For building runtime libs
+  depsBuildTarget =
+    if hostPlatform == buildPlatform then [
+      targetPackages.stdenv.cc.bintools # newly-built gcc will be used
+    ] else assert targetPlatform == hostPlatform; [ # build != host == target
+      stdenv.cc
+    ];
+
+  buildInputs = [
+    gmp mpfr libmpc libelf
+    targetPackages.stdenv.cc.bintools # For linking code at run-time
+  ] ++ (optional (ppl != null) ppl)
     ++ (optional (cloogppl != null) cloogppl)
     ++ (optional (zlib != null) zlib)
     ++ (optional langJava boehmgc)
diff --git a/pkgs/development/compilers/gcc/4.9/default.nix b/pkgs/development/compilers/gcc/4.9/default.nix
index 7aa5610b539..f564a44ca46 100644
--- a/pkgs/development/compilers/gcc/4.9/default.nix
+++ b/pkgs/development/compilers/gcc/4.9/default.nix
@@ -267,8 +267,18 @@ stdenv.mkDerivation ({
     ++ (optional (perl != null) perl)
     ++ (optional javaAwtGtk pkgconfig);
 
-  buildInputs = [ gmp mpfr libmpc libelf ]
-    ++ (optional (cloog != null) cloog)
+  # For building runtime libs
+  depsBuildTarget =
+    if hostPlatform == buildPlatform then [
+      targetPackages.stdenv.cc.bintools # newly-built gcc will be used
+    ] else assert targetPlatform == hostPlatform; [ # build != host == target
+      stdenv.cc
+    ];
+
+  buildInputs = [
+    gmp mpfr libmpc libelf
+    targetPackages.stdenv.cc.bintools # For linking code at run-time
+  ] ++ (optional (cloog != null) cloog)
     ++ (optional (isl != null) isl)
     ++ (optional (zlib != null) zlib)
     ++ (optionals langJava [ boehmgc zip unzip ])
diff --git a/pkgs/development/compilers/gcc/5/default.nix b/pkgs/development/compilers/gcc/5/default.nix
index 3a7ad0a4c59..6ccd47c9729 100644
--- a/pkgs/development/compilers/gcc/5/default.nix
+++ b/pkgs/development/compilers/gcc/5/default.nix
@@ -49,9 +49,6 @@ assert libelf != null -> zlib != null;
 # Make sure we get GNU sed.
 assert hostPlatform.isDarwin -> gnused != null;
 
-# Need c++filt on darwin
-assert hostPlatform.isDarwin -> targetPackages.stdenv.cc.bintools or null != null;
-
 # The go frontend is written in c++
 assert langGo -> langCC;
 
@@ -282,8 +279,18 @@ stdenv.mkDerivation ({
     ++ (optional (perl != null) perl)
     ++ (optional javaAwtGtk pkgconfig);
 
-  buildInputs = [ gmp mpfr libmpc libelf ]
-    ++ (optional (isl != null) isl)
+  # For building runtime libs
+  depsBuildTarget =
+    if hostPlatform == buildPlatform then [
+      targetPackages.stdenv.cc.bintools # newly-built gcc will be used
+    ] else assert targetPlatform == hostPlatform; [ # build != host == target
+      stdenv.cc
+    ];
+
+  buildInputs = [
+    gmp mpfr libmpc libelf
+    targetPackages.stdenv.cc.bintools # For linking code at run-time
+  ] ++ (optional (isl != null) isl)
     ++ (optional (zlib != null) zlib)
     ++ (optionals langJava [ boehmgc zip unzip ])
     ++ (optionals javaAwtGtk ([ gtk2 libart_lgpl ] ++ xlibs))
diff --git a/pkgs/development/compilers/gcc/6/default.nix b/pkgs/development/compilers/gcc/6/default.nix
index 894abdb43fb..ab4cdfe4db6 100644
--- a/pkgs/development/compilers/gcc/6/default.nix
+++ b/pkgs/development/compilers/gcc/6/default.nix
@@ -49,9 +49,6 @@ assert libelf != null -> zlib != null;
 # Make sure we get GNU sed.
 assert hostPlatform.isDarwin -> gnused != null;
 
-# Need c++filt on darwin
-assert hostPlatform.isDarwin -> targetPackages.stdenv.cc.bintools or null != null;
-
 # The go frontend is written in c++
 assert langGo -> langCC;
 
@@ -281,8 +278,18 @@ stdenv.mkDerivation ({
     ++ (optional (perl != null) perl)
     ++ (optional javaAwtGtk pkgconfig);
 
-  buildInputs = [ gmp mpfr libmpc libelf ]
-    ++ (optional (isl != null) isl)
+  # For building runtime libs
+  depsBuildTarget =
+    if hostPlatform == buildPlatform then [
+      targetPackages.stdenv.cc.bintools # newly-built gcc will be used
+    ] else assert targetPlatform == hostPlatform; [ # build != host == target
+      stdenv.cc
+    ];
+
+  buildInputs = [
+    gmp mpfr libmpc libelf
+    targetPackages.stdenv.cc.bintools # For linking code at run-time
+  ] ++ (optional (isl != null) isl)
     ++ (optional (zlib != null) zlib)
     ++ (optionals langJava [ boehmgc zip unzip ])
     ++ (optionals javaAwtGtk ([ gtk2 libart_lgpl ] ++ xlibs))
diff --git a/pkgs/development/compilers/gcc/7/default.nix b/pkgs/development/compilers/gcc/7/default.nix
index 09e111f37fb..acf61aea002 100644
--- a/pkgs/development/compilers/gcc/7/default.nix
+++ b/pkgs/development/compilers/gcc/7/default.nix
@@ -50,9 +50,6 @@ assert libelf != null -> zlib != null;
 # Make sure we get GNU sed.
 assert hostPlatform.isDarwin -> gnused != null;
 
-# Need c++filt on darwin
-assert hostPlatform.isDarwin -> targetPackages.stdenv.cc.bintools or null != null;
-
 # The go frontend is written in c++
 assert langGo -> langCC;
 
@@ -278,8 +275,18 @@ stdenv.mkDerivation ({
     ++ (optional (perl != null) perl)
     ++ (optional javaAwtGtk pkgconfig);
 
-  buildInputs = [ gmp mpfr libmpc libelf flex ]
-    ++ (optional (isl != null) isl)
+  # For building runtime libs
+  depsBuildTarget =
+    if hostPlatform == buildPlatform then [
+      targetPackages.stdenv.cc.bintools # newly-built gcc will be used
+    ] else assert targetPlatform == hostPlatform; [ # build != host == target
+      stdenv.cc
+    ];
+
+  buildInputs = [
+    gmp mpfr libmpc libelf flex
+    targetPackages.stdenv.cc.bintools # For linking code at run-time
+  ] ++ (optional (isl != null) isl)
     ++ (optional (zlib != null) zlib)
     ++ (optionals langJava [ boehmgc zip unzip ])
     ++ (optionals javaAwtGtk ([ gtk2 libart_lgpl ] ++ xlibs))
diff --git a/pkgs/development/compilers/gcc/snapshot/default.nix b/pkgs/development/compilers/gcc/snapshot/default.nix
index 95534780977..d48b7ba8d55 100644
--- a/pkgs/development/compilers/gcc/snapshot/default.nix
+++ b/pkgs/development/compilers/gcc/snapshot/default.nix
@@ -50,9 +50,6 @@ assert libelf != null -> zlib != null;
 # Make sure we get GNU sed.
 assert hostPlatform.isDarwin -> gnused != null;
 
-# Need c++filt on darwin
-assert hostPlatform.isDarwin -> targetPackages.stdenv.cc.bintools or null != null;
-
 # The go frontend is written in c++
 assert langGo -> langCC;
 
@@ -265,8 +262,18 @@ stdenv.mkDerivation ({
     ++ (optional (perl != null) perl)
     ++ (optional javaAwtGtk pkgconfig);
 
-  buildInputs = [ gmp mpfr libmpc libelf flex ]
-    ++ (optional (isl != null) isl)
+  # For building runtime libs
+  depsBuildTarget =
+    if hostPlatform == buildPlatform then [
+      targetPackages.stdenv.cc.bintools # newly-built gcc will be used
+    ] else assert targetPlatform == hostPlatform; [ # build != host == target
+      stdenv.cc
+    ];
+
+  buildInputs = [
+    gmp mpfr libmpc libelf flex
+    targetPackages.stdenv.cc.bintools # For linking code at run-time
+  ] ++ (optional (isl != null) isl)
     ++ (optional (zlib != null) zlib)
     ++ (optionals langJava [ boehmgc zip unzip ])
     ++ (optionals javaAwtGtk ([ gtk2 libart_lgpl ] ++ xlibs))