From 933e701dac1936c6f15c765b5687fbc623464ec7 Mon Sep 17 00:00:00 2001
From: Mike Sperber <sperber@deinprogramm.de>
Date: Thu, 22 Mar 2012 18:00:31 +0100
Subject: Unbreak floating point on middle-endian machines.

On some ARMs (and maybe other platforms), doubles are stored with the
the two 32-bit words reversed with respect to more common
architectures.

The symptom is this:

> io_lib:write(1.0).
"0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005299808824"

Detect that and account for it when decoding floats.
---
 xcomp/erl-xcomp-vxworks_ppc32.conf | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'xcomp/erl-xcomp-vxworks_ppc32.conf')

diff --git a/xcomp/erl-xcomp-vxworks_ppc32.conf b/xcomp/erl-xcomp-vxworks_ppc32.conf
index ed8305ea93..bea4b3e374 100644
--- a/xcomp/erl-xcomp-vxworks_ppc32.conf
+++ b/xcomp/erl-xcomp-vxworks_ppc32.conf
@@ -187,6 +187,15 @@ AR="$WIND_BASE/gnu/3.4.4-vxworks-6.3/$WIND_HOST_TYPE/bin/arppc"
 #   value is used, `configure' will try to figure this out automatically.
 erl_xcomp_bigendian=yes
 
+# * `erl_xcomp_double_middle_endian` - `yes|no`. No default. If `yes`, the
+#   target system must have doubles in "middle-endian" format. If
+#   `no`, it has "regular" endianness. This can often be automatically
+#   detected, but not always. If not automatically detected,
+#   `configure` will fail unless this variable is set. Since no
+#   default value is used, `configure` will try to figure this out
+#   automatically.
+#erl_xcomp_double_middle_endian
+
 # * `erl_xcomp_clock_gettime_cpu_time' - `yes|no'. Defaults to `no'. If `yes',
 #   the target system must have a working `clock_gettime()' implementation
 #   that can be used for retrieving process CPU time.
-- 
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