Fix GHC bootstrap in pkgsMusl and include patch for binutils/16177

pkgs/development/compilers/ghc/8.6.5-binary.nix

@@ -1,6 +1,6 @@
 { stdenv
 , fetchurl, perl, gcc
-, ncurses5, gmp, glibc, libiconv
+, ncurses5, ncurses6, gmp, glibc, libiconv
 , llvmPackages
 }:
 
@@ -10,8 +10,12 @@ assert stdenv.targetPlatform == stdenv.hostPlatform;
 let
   useLLVM = !stdenv.targetPlatform.isx86;
 
+  useNcurses6 = stdenv.hostPlatform.system == "x86_64-linux";
+
+  ourNcurses = if useNcurses6 then ncurses6 else ncurses5;
+
   libPath = stdenv.lib.makeLibraryPath ([
-    ncurses5 gmp
+    ourNcurses gmp
   ] ++ stdenv.lib.optional (stdenv.hostPlatform.isDarwin) libiconv);
 
   libEnvVar = stdenv.lib.optionalString stdenv.hostPlatform.isDarwin "DY"
@@ -34,12 +38,16 @@ stdenv.mkDerivation rec {
   # https://downloads.haskell.org/~ghc/8.6.5/
   src = fetchurl ({
     i686-linux = {
+      # Don't use the Fedora27 build (as below) because there isn't one!
       url = "http://haskell.org/ghc/dist/${version}/ghc-${version}-i386-deb9-linux.tar.xz";
       sha256 = "1p2h29qghql19ajk755xa0yxkn85slbds8m9n5196ris743vkp8w";
     };
     x86_64-linux = {
-      url = "http://haskell.org/ghc/dist/${version}/ghc-${version}-x86_64-deb9-linux.tar.xz";
-      sha256 = "1pqlx6rdjs2110g0y1i9f8x18lmdizibjqd15f5xahcz39hgaxdw";
+      # This is the Fedora build because it links against ncurses6 where the
+      # deb9 one links against ncurses5, see here
+      # https://github.com/NixOS/nixpkgs/issues/85924 for a discussion
+      url = "http://haskell.org/ghc/dist/${version}/ghc-${version}-x86_64-fedora27-linux.tar.xz";
+      sha256 = "18dlqm5d028fqh6ghzn7pgjspr5smw030jjzl3kq6q1kmwzbay6g";
     };
     aarch64-linux = {
       url = "http://haskell.org/ghc/dist/${version}/ghc-${version}-aarch64-ubuntu18.04-linux.tar.xz";
@@ -88,9 +96,12 @@ stdenv.mkDerivation rec {
     '' +
     # Rename needed libraries and binaries, fix interpreter
     stdenv.lib.optionalString stdenv.isLinux ''
-      find . -type f -perm -0100 -exec patchelf \
+      find . -type f -perm -0100 \
+          -exec patchelf \
           --replace-needed libncurses${stdenv.lib.optionalString stdenv.is64bit "w"}.so.5 libncurses.so \
-          --replace-needed libtinfo.so libtinfo.so.5 \
+          ${ # This isn't required for x86_64-linux where we use ncurses6
+             stdenv.lib.optionalString (!useNcurses6) "--replace-needed libtinfo.so libtinfo.so.5"
+           } \
           --interpreter ${glibcDynLinker} {} \;
 
       sed -i "s|/usr/bin/perl|perl\x00        |" ghc-${version}/ghc/stage2/build/tmp/ghc-stage2

pkgs/development/tools/misc/binutils/R_ARM_COPY.patch

@@ -0,0 +1,29 @@
+@@ -, +, @@ 
+---
+ bfd/elf32-arm.c | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+--- a/bfd/elf32-arm.c	
++++ a/bfd/elf32-arm.c	
+@@ -15398,7 +15398,11 @@ elf32_arm_adjust_dynamic_symbol (struct bfd_link_info * info,
+      linker to copy the initial value out of the dynamic object and into
+      the runtime process image.  We need to remember the offset into the
+      .rel(a).bss section we are going to use.  */
+-  if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
++  if (info->nocopyreloc == 0
++      && (h->root.u.def.section->flags & SEC_ALLOC) != 0
++      /* PR 16177: A copy is only needed if the input section is readonly.  */
++      && (h->root.u.def.section->flags & SEC_READONLY) != 0
++      && h->size != 0)
+     {
+       s = globals->root.sdynrelro;
+       srel = globals->root.sreldynrelro;
+@@ -15410,6 +15414,8 @@ elf32_arm_adjust_dynamic_symbol (struct bfd_link_info * info,
+     }
+   if (info->nocopyreloc == 0
+       && (h->root.u.def.section->flags & SEC_ALLOC) != 0
++      /* PR 16177: A copy is only needed if the input section is readonly.  */
++      && (h->root.u.def.section->flags & SEC_READONLY) != 0
+       && h->size != 0)
+     {
+       elf32_arm_allocate_dynrelocs (info, srel, 1);
+

pkgs/development/tools/misc/binutils/default.nix

@@ -101,6 +101,14 @@ stdenv.mkDerivation {
     ./patches/2.31/0001-x86-Properly-add-X86_ISA_1_NEEDED-property.patch
   ]
   ++ lib.optional stdenv.targetPlatform.isiOS ./support-ios.patch
+  ++ # This patch was suggested by Nick Clifton to fix
+     # https://sourceware.org/bugzilla/show_bug.cgi?id=16177
+     # It can be removed when that 7-year-old bug is closed.
+     # This binutils bug causes GHC to emit broken binaries on armv7, and
+     # indeed GHC will refuse to compile with a binutils suffering from it. See
+     # this comment for more information:
+     # https://gitlab.haskell.org/ghc/ghc/issues/4210#note_78333
+     lib.optional stdenv.targetPlatform.isAarch32 ./R_ARM_COPY.patch
   ;
 
   outputs = [ "out" "info" "man" ];