From c50c3a47b328c10780f4453b925a3e36d182c2bd Mon Sep 17 00:00:00 2001
From: Andy Wingo <wingo@pobox.com>
Date: Tue, 14 Mar 2017 09:43:50 +0100
Subject: [PATCH] configure detects which set of prebuilt binaries to use

* configure.ac: Use detected endianness and word size to automatically
  select which set of prebuilt binaries to use.
* meta/build-env.in (top_builddir):
* meta/uninstalled-env.in (top_builddir): Update to use
  SCM_PREBUILT_BINARIES for prebuilt entry in GUILE_LOAD_COMPILED_PATH.
* prebuilt/32-bit-big-endian:
* prebuilt/32-bit-little-endian:
* prebuilt/64-bit-little-endian: New links.
* prebuilt/x86_64-pc-linux-gnu: Remove this link now that it's unneeded.
---
 configure.ac                  | 12 ++++++++++++
 meta/build-env.in             |  4 ++--
 meta/uninstalled-env.in       |  4 ++--
 prebuilt/32-bit-big-endian    |  1 +
 prebuilt/32-bit-little-endian |  1 +
 prebuilt/64-bit-little-endian |  1 +
 prebuilt/x86_64-pc-linux-gnu  |  1 -
 7 files changed, 19 insertions(+), 5 deletions(-)
 create mode 120000 prebuilt/32-bit-big-endian
 create mode 120000 prebuilt/32-bit-little-endian
 create mode 120000 prebuilt/64-bit-little-endian
 delete mode 120000 prebuilt/x86_64-pc-linux-gnu

diff --git a/configure.ac b/configure.ac
index 24ee878d5..217364bbf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -631,6 +631,18 @@ AC_SUBST([SCM_I_GSC_T_UINTPTR])
 AC_SUBST([SCM_I_GSC_NEEDS_STDINT_H])
 AC_SUBST([SCM_I_GSC_NEEDS_INTTYPES_H])
 
+AC_MSG_CHECKING([for which prebuilt binary set to use during bootstrap])
+SCM_PREBUILT_BINARIES=
+case "$ac_cv_c_bigendian-$ac_cv_sizeof_void_p" in
+  yes-8) SCM_PREBUILT_BINARIES=64-bit-big-endian;;
+  yes-4) SCM_PREBUILT_BINARIES=32-bit-big-endian;;
+  no-8) SCM_PREBUILT_BINARIES=64-bit-little-endian;;
+  no-4) SCM_PREBUILT_BINARIES=32-bit-little-endian;;
+  *) AC_MSG_ERROR([Unexpected endianness+pointer size combination.])
+esac
+AC_MSG_RESULT($SCM_PREBUILT_BINARIES)
+AC_SUBST([SCM_PREBUILT_BINARIES])
+
 AC_HEADER_STDC
 AC_HEADER_TIME
 AC_HEADER_SYS_WAIT
diff --git a/meta/build-env.in b/meta/build-env.in
index b271d0bc8..27e604366 100644
--- a/meta/build-env.in
+++ b/meta/build-env.in
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-#	Copyright (C) 2003, 2006, 2008-2012, 2016 Free Software Foundation
+#	Copyright (C) 2003, 2006, 2008-2012, 2016, 2017 Free Software Foundation
 #
 #   This file is part of GNU Guile.
 #
@@ -54,7 +54,7 @@ then
         GUILE_LOAD_PATH="$GUILE_LOAD_PATH:${top_builddir}/module:${top_builddir}/guile-readline"
     fi
     export GUILE_LOAD_PATH
-    GUILE_LOAD_COMPILED_PATH="${top_builddir}/module:${top_builddir}/bootstrap:${top_srcdir}/prebuilt/@host@:${top_builddir}/guile-readline"
+    GUILE_LOAD_COMPILED_PATH="${top_builddir}/module:${top_builddir}/bootstrap:${top_srcdir}/prebuilt/@SCM_PREBUILT_BINARIES@:${top_builddir}/guile-readline"
     export GUILE_LOAD_COMPILED_PATH
 
     # Don't look in installed dirs for guile modules
diff --git a/meta/uninstalled-env.in b/meta/uninstalled-env.in
index ff32902d0..ed932d0cb 100644
--- a/meta/uninstalled-env.in
+++ b/meta/uninstalled-env.in
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-#	Copyright (C) 2003, 2006, 2008, 2009, 2010, 2011, 2012, 2015 Free Software Foundation
+#	Copyright (C) 2003, 2006, 2008, 2009, 2010, 2011, 2012, 2015, 2017 Free Software Foundation
 #
 #   This file is part of GUILE.
 #
@@ -80,7 +80,7 @@ then
     fi
     export GUILE_LOAD_PATH
 
-    for d in "/prebuilt/@host@" "/bootstrap" "/module" "/guile-readline"
+    for d in "/prebuilt/@SCM_PREBUILT_BINARIES@" "/bootstrap" "/module" "/guile-readline"
     do
         # This hair prevents double inclusion.
         # The ":" prevents prefix aliasing.
diff --git a/prebuilt/32-bit-big-endian b/prebuilt/32-bit-big-endian
new file mode 120000
index 000000000..3b619a6a1
--- /dev/null
+++ b/prebuilt/32-bit-big-endian
@@ -0,0 +1 @@
+mips-unknown-linux-gnu
\ No newline at end of file
diff --git a/prebuilt/32-bit-little-endian b/prebuilt/32-bit-little-endian
new file mode 120000
index 000000000..63f12a0b3
--- /dev/null
+++ b/prebuilt/32-bit-little-endian
@@ -0,0 +1 @@
+i686-pc-linux-gnu
\ No newline at end of file
diff --git a/prebuilt/64-bit-little-endian b/prebuilt/64-bit-little-endian
new file mode 120000
index 000000000..8dd176f8b
--- /dev/null
+++ b/prebuilt/64-bit-little-endian
@@ -0,0 +1 @@
+x86_64-unknown-linux-gnu
\ No newline at end of file
diff --git a/prebuilt/x86_64-pc-linux-gnu b/prebuilt/x86_64-pc-linux-gnu
deleted file mode 120000
index 7ef2cbd31..000000000
--- a/prebuilt/x86_64-pc-linux-gnu
+++ /dev/null
@@ -1 +0,0 @@
-./x86_64-unknown-linux-gnu
\ No newline at end of file