bootstrap: Build bootstrap bash deterministically.

* gnu/packages/patches/bash-4.4-linux-pgrp-pipe.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/make-bootstrap.scm (static-bash-for-bootstrap): New variable.
(%static-inputs): Use 'static-bash-for-bootstrap' instead of 'static-bash'.

gnu/local.mk

@@ -697,6 +697,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/avidemux-install-to-lib.patch		\
   %D%/packages/patches/awesome-reproducible-png.patch		\
   %D%/packages/patches/azr3.patch				\
+  %D%/packages/patches/bash-4.4-linux-pgrp-pipe.patch		\
   %D%/packages/patches/bash-completion-directories.patch	\
   %D%/packages/patches/bastet-change-source-of-unordered_set.patch	\
   %D%/packages/patches/bazaar-CVE-2017-14176.patch		\

gnu/packages/make-bootstrap.scm

@@ -2,7 +2,7 @@
 ;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2017 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
-;;; Copyright © 2018 Mark H Weaver <mhw@netris.org>
+;;; Copyright © 2018, 2019 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
@@ -125,6 +125,15 @@ for `sh' in $PATH, and without nscd, and with static NSS modules."
                                 (current-source-location)
                                 #:native-inputs native-inputs))
 
+(define static-bash-for-bootstrap
+  (package
+    (inherit static-bash)
+    (source (origin
+              (inherit (package-source static-bash))
+              (patches
+               (cons (search-patch "bash-4.4-linux-pgrp-pipe.patch")
+                     (origin-patches (package-source static-bash))))))))
+
 (define %static-inputs
   ;; Packages that are to be used as %BOOTSTRAP-INPUTS.
   (let ((coreutils (package (inherit coreutils)
@@ -192,7 +201,7 @@ for `sh' in $PATH, and without nscd, and with static NSS modules."
                                  (("-Wl,-export-dynamic") ""))
                                #t)))))))
                 (inputs (if (%current-target-system)
-                            `(("bash" ,static-bash))
+                            `(("bash" ,static-bash-for-bootstrap))
                             '()))))
 	(tar (package (inherit tar)
 	       (arguments
@@ -233,7 +242,7 @@ for `sh' in $PATH, and without nscd, and with static NSS modules."
                ("sed" ,sed)
                ("grep" ,grep)
                ("gawk" ,gawk)))
-      ("bash" ,static-bash))))
+      ("bash" ,static-bash-for-bootstrap))))
 
 (define %static-binaries
   (package

gnu/packages/patches/bash-4.4-linux-pgrp-pipe.patch

@@ -0,0 +1,30 @@
+Unconditionally enable PGRP_PIPE on Linux (the kernel), regardless of
+the kernel version in use on the build machine.
+
+--- configure.ac.orig	1969-12-31 19:00:00.000000000 -0500
++++ configure.ac	2019-08-11 22:28:26.038841961 -0400
+@@ -1092,9 +1092,7 @@
+ solaris2*)	LOCAL_CFLAGS=-DSOLARIS ;;
+ lynxos*)	LOCAL_CFLAGS=-DRECYCLES_PIDS ;;
+ linux*)		LOCAL_LDFLAGS=-rdynamic		 # allow dynamic loading
+-		case "`uname -r`" in
+-		2.[[456789]]*|[[34]]*)	AC_DEFINE(PGRP_PIPE) ;;
+-		esac ;;
++		AC_DEFINE(PGRP_PIPE) ;;
+ *qnx6*)		LOCAL_CFLAGS="-Dqnx -Dqnx6" LOCAL_LIBS="-lncurses" ;;
+ *qnx*)		LOCAL_CFLAGS="-Dqnx -F -3s" LOCAL_LDFLAGS="-3s" LOCAL_LIBS="-lunix -lncurses" ;;
+ powerux*)	LOCAL_LIBS="-lgen" ;;
+--- configure.orig	1969-12-31 19:00:00.000000000 -0500
++++ configure	2019-08-11 22:28:10.166763255 -0400
+@@ -16064,10 +16064,7 @@
+ solaris2*)	LOCAL_CFLAGS=-DSOLARIS ;;
+ lynxos*)	LOCAL_CFLAGS=-DRECYCLES_PIDS ;;
+ linux*)		LOCAL_LDFLAGS=-rdynamic		 # allow dynamic loading
+-		case "`uname -r`" in
+-		2.[456789]*|[34]*)	$as_echo "#define PGRP_PIPE 1" >>confdefs.h
+- ;;
+-		esac ;;
++		$as_echo "#define PGRP_PIPE 1" >>confdefs.h ;;
+ *qnx6*)		LOCAL_CFLAGS="-Dqnx -Dqnx6" LOCAL_LIBS="-lncurses" ;;
+ *qnx*)		LOCAL_CFLAGS="-Dqnx -F -3s" LOCAL_LDFLAGS="-3s" LOCAL_LIBS="-lunix -lncurses" ;;
+ powerux*)	LOCAL_LIBS="-lgen" ;;