From 5b46a7c240fe9e22a673d7dbd107498e042b437b Mon Sep 17 00:00:00 2001
From: Will Dietz <w@wdtz.org>
Date: Tue, 6 Mar 2018 10:15:05 -0600
Subject: [PATCH] gcc7: make building w/LTO support optional, don't use in
 bootstrap tools

---
 pkgs/development/compilers/gcc/7/default.nix |  3 ++-
 pkgs/stdenv/linux/make-bootstrap-tools.nix   | 18 ++++++++++--------
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/pkgs/development/compilers/gcc/7/default.nix b/pkgs/development/compilers/gcc/7/default.nix
index 68c05d28978..39b3e4734fe 100644
--- a/pkgs/development/compilers/gcc/7/default.nix
+++ b/pkgs/development/compilers/gcc/7/default.nix
@@ -6,6 +6,7 @@
 , profiledCompiler ? false
 , staticCompiler ? false
 , enableShared ? true
+, enableLTO ? true
 , texinfo ? null
 , perl ? null # optional, for texi2pod (then pod2man)
 , gmp, mpfr, libmpc, gettext, which
@@ -257,7 +258,7 @@ stdenv.mkDerivation ({
 
     # Basic configuration
     [
-      "--enable-lto"
+      (if enableLTO then "--enable-lto" else "--disable-lto")
       "--disable-libstdcxx-pch"
       "--without-included-gettext"
       "--with-system-zlib"
diff --git a/pkgs/stdenv/linux/make-bootstrap-tools.nix b/pkgs/stdenv/linux/make-bootstrap-tools.nix
index 8d513625df2..86503b96245 100644
--- a/pkgs/stdenv/linux/make-bootstrap-tools.nix
+++ b/pkgs/stdenv/linux/make-bootstrap-tools.nix
@@ -33,6 +33,8 @@ in with pkgs; rec {
     '';
   };
 
+  bootGCC = gcc.cc.override { enableLTO = false; };
+
   build =
 
     stdenv.mkDerivation {
@@ -109,12 +111,12 @@ in with pkgs; rec {
         cp -d ${gnugrep.pcre.out}/lib/libpcre*.so* $out/lib # needed by grep
 
         # Copy what we need of GCC.
-        cp -d ${gcc.cc.out}/bin/gcc $out/bin
-        cp -d ${gcc.cc.out}/bin/cpp $out/bin
-        cp -d ${gcc.cc.out}/bin/g++ $out/bin
-        cp -d ${gcc.cc.lib}/lib/libgcc_s.so* $out/lib
-        cp -d ${gcc.cc.lib}/lib/libstdc++.so* $out/lib
-        cp -rd ${gcc.cc.out}/lib/gcc $out/lib
+        cp -d ${bootGCC.out}/bin/gcc $out/bin
+        cp -d ${bootGCC.out}/bin/cpp $out/bin
+        cp -d ${bootGCC.out}/bin/g++ $out/bin
+        cp -d ${bootGCC.lib}/lib/libgcc_s.so* $out/lib
+        cp -d ${bootGCC.lib}/lib/libstdc++.so* $out/lib
+        cp -rd ${bootGCC.out}/lib/gcc $out/lib
         chmod -R u+w $out/lib
         rm -f $out/lib/gcc/*/*/include*/linux
         rm -f $out/lib/gcc/*/*/include*/sound
@@ -122,11 +124,11 @@ in with pkgs; rec {
         rm -f $out/lib/gcc/*/*/include-fixed/asm
         rm -rf $out/lib/gcc/*/*/plugin
         #rm -f $out/lib/gcc/*/*/*.a
-        cp -rd ${gcc.cc.out}/libexec/* $out/libexec
+        cp -rd ${bootGCC.out}/libexec/* $out/libexec
         chmod -R u+w $out/libexec
         rm -rf $out/libexec/gcc/*/*/plugin
         mkdir -p $out/include
-        cp -rd ${gcc.cc.out}/include/c++ $out/include
+        cp -rd ${bootGCC.out}/include/c++ $out/include
         chmod -R u+w $out/include
         rm -rf $out/include/c++/*/ext/pb_ds
         rm -rf $out/include/c++/*/ext/parallel