aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--aclocal.m463
-rw-r--r--erts/aclocal.m463
-rw-r--r--erts/configure.in1
-rw-r--r--erts/emulator/beam/erl_bits.c10
-rw-r--r--lib/erl_interface/aclocal.m463
-rw-r--r--lib/odbc/aclocal.m463
-rw-r--r--lib/wx/aclocal.m463
-rw-r--r--xcomp/README.md8
-rw-r--r--xcomp/erl-xcomp-TileraMDE2.0-tilepro.conf9
-rw-r--r--xcomp/erl-xcomp-avr32-atmel-linux-gnu.conf9
-rw-r--r--xcomp/erl-xcomp-mips-linux.conf9
-rw-r--r--xcomp/erl-xcomp-vars.sh2
-rw-r--r--xcomp/erl-xcomp-vxworks_ppc32.conf9
-rw-r--r--xcomp/erl-xcomp-x86_64-saf-linux-gnu.conf9
-rw-r--r--xcomp/erl-xcomp.conf.template9
15 files changed, 389 insertions, 1 deletions
diff --git a/aclocal.m4 b/aclocal.m4
index 339a15a2bb..9c5bcd6dc6 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -59,6 +59,7 @@ AC_ARG_VAR(erl_xcomp_isysroot, [Absolute cross system root include path (only us
dnl Cross compilation variables
AC_ARG_VAR(erl_xcomp_bigendian, [big endian system: yes|no (only used when cross compiling)])
+AC_ARG_VAR(erl_xcomp_double_middle_endian, [double-middle-endian system: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_clock_gettime_correction, [clock_gettime() can be used for time correction: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_nptl, [have Native POSIX Thread Library: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_usable_sigusrx, [SIGUSR1 and SIGUSR2 can be used: yes|no (only used when cross compiling)])
@@ -606,6 +607,60 @@ ifelse([$5], , , [$5
fi
])
+dnl ----------------------------------------------------------------------
+dnl
+dnl AC_DOUBLE_MIDDLE_ENDIAN
+dnl
+dnl Checks whether doubles are represented in "middle-endian" format.
+dnl Sets ac_cv_double_middle_endian={no,yes,unknown} accordingly,
+dnl as well as DOUBLE_MIDDLE_ENDIAN.
+dnl
+dnl
+
+AC_DEFUN([AC_C_DOUBLE_MIDDLE_ENDIAN],
+[AC_CACHE_CHECK(whether double word ordering is middle-endian, ac_cv_c_double_middle_endian,
+[# It does not; compile a test program.
+AC_RUN_IFELSE(
+[AC_LANG_SOURCE([[int
+main(void)
+{
+ int i = 0;
+ int zero = 0;
+ union
+ {
+ double d;
+ char c[sizeof (double)];
+ } v;
+ v.d = 1.0;
+
+
+ while (i < sizeof(double) / 2)
+ {
+ if (v.c[i] != 0)
+ zero = 1;
+ ++i;
+ }
+ exit (zero);
+}
+]])],
+ [ac_cv_c_double_middle_endian=no],
+ [ac_cv_c_double_middle_endian=yes],
+ [ac_cv_c_double_middle=unknown])])
+case $ac_cv_c_double_middle_endian in
+ yes)
+ m4_default([$1],
+ [AC_DEFINE([DOUBLE_MIDDLE_ENDIAN], 1,
+ [Define to 1 if your processor stores the words in a double in
+ middle-endian format (like some ARMs).])]) ;;
+ no)
+ $2 ;;
+ *)
+ m4_default([$3],
+ [AC_MSG_ERROR([unknown double endianness
+presetting ac_cv_c_double_middle_endian=no (or yes) will help])]) ;;
+esac
+])# AC_C_DOUBLE_MIDDLE_ENDIAN
+
dnl ----------------------------------------------------------------------
dnl
@@ -1337,6 +1392,14 @@ if test "$ac_cv_c_bigendian" = "yes"; then
AC_DEFINE(ETHR_BIGENDIAN, 1, [Define if bigendian])
fi
+case X$erl_xcomp_double_middle_endian in
+ X) ;;
+ Xyes|Xno) ac_cv_c_double_middle_endian=$erl_xcomp_double_middle_endian;;
+ *) AC_MSG_ERROR([Bad erl_xcomp_double_middle_endian value: $erl_xcomp_double_middle_endian]);;
+esac
+
+AC_C_DOUBLE_MIDDLE_ENDIAN
+
AC_ARG_ENABLE(native-ethr-impls,
AS_HELP_STRING([--disable-native-ethr-impls],
[disable native ethread implementations]),
diff --git a/erts/aclocal.m4 b/erts/aclocal.m4
index 339a15a2bb..9c5bcd6dc6 100644
--- a/erts/aclocal.m4
+++ b/erts/aclocal.m4
@@ -59,6 +59,7 @@ AC_ARG_VAR(erl_xcomp_isysroot, [Absolute cross system root include path (only us
dnl Cross compilation variables
AC_ARG_VAR(erl_xcomp_bigendian, [big endian system: yes|no (only used when cross compiling)])
+AC_ARG_VAR(erl_xcomp_double_middle_endian, [double-middle-endian system: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_clock_gettime_correction, [clock_gettime() can be used for time correction: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_nptl, [have Native POSIX Thread Library: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_usable_sigusrx, [SIGUSR1 and SIGUSR2 can be used: yes|no (only used when cross compiling)])
@@ -606,6 +607,60 @@ ifelse([$5], , , [$5
fi
])
+dnl ----------------------------------------------------------------------
+dnl
+dnl AC_DOUBLE_MIDDLE_ENDIAN
+dnl
+dnl Checks whether doubles are represented in "middle-endian" format.
+dnl Sets ac_cv_double_middle_endian={no,yes,unknown} accordingly,
+dnl as well as DOUBLE_MIDDLE_ENDIAN.
+dnl
+dnl
+
+AC_DEFUN([AC_C_DOUBLE_MIDDLE_ENDIAN],
+[AC_CACHE_CHECK(whether double word ordering is middle-endian, ac_cv_c_double_middle_endian,
+[# It does not; compile a test program.
+AC_RUN_IFELSE(
+[AC_LANG_SOURCE([[int
+main(void)
+{
+ int i = 0;
+ int zero = 0;
+ union
+ {
+ double d;
+ char c[sizeof (double)];
+ } v;
+ v.d = 1.0;
+
+
+ while (i < sizeof(double) / 2)
+ {
+ if (v.c[i] != 0)
+ zero = 1;
+ ++i;
+ }
+ exit (zero);
+}
+]])],
+ [ac_cv_c_double_middle_endian=no],
+ [ac_cv_c_double_middle_endian=yes],
+ [ac_cv_c_double_middle=unknown])])
+case $ac_cv_c_double_middle_endian in
+ yes)
+ m4_default([$1],
+ [AC_DEFINE([DOUBLE_MIDDLE_ENDIAN], 1,
+ [Define to 1 if your processor stores the words in a double in
+ middle-endian format (like some ARMs).])]) ;;
+ no)
+ $2 ;;
+ *)
+ m4_default([$3],
+ [AC_MSG_ERROR([unknown double endianness
+presetting ac_cv_c_double_middle_endian=no (or yes) will help])]) ;;
+esac
+])# AC_C_DOUBLE_MIDDLE_ENDIAN
+
dnl ----------------------------------------------------------------------
dnl
@@ -1337,6 +1392,14 @@ if test "$ac_cv_c_bigendian" = "yes"; then
AC_DEFINE(ETHR_BIGENDIAN, 1, [Define if bigendian])
fi
+case X$erl_xcomp_double_middle_endian in
+ X) ;;
+ Xyes|Xno) ac_cv_c_double_middle_endian=$erl_xcomp_double_middle_endian;;
+ *) AC_MSG_ERROR([Bad erl_xcomp_double_middle_endian value: $erl_xcomp_double_middle_endian]);;
+esac
+
+AC_C_DOUBLE_MIDDLE_ENDIAN
+
AC_ARG_ENABLE(native-ethr-impls,
AS_HELP_STRING([--disable-native-ethr-impls],
[disable native ethread implementations]),
diff --git a/erts/configure.in b/erts/configure.in
index b801994e14..6583db8116 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -1681,6 +1681,7 @@ case X$erl_xcomp_bigendian in
esac
AC_C_BIGENDIAN
+AC_C_DOUBLE_MIDDLE_ENDIAN
dnl fdatasync syscall (Unix only)
AC_CHECK_FUNCS([fdatasync])
diff --git a/erts/emulator/beam/erl_bits.c b/erts/emulator/beam/erl_bits.c
index 6f7309f493..b7c82935ff 100644
--- a/erts/emulator/beam/erl_bits.c
+++ b/erts/emulator/beam/erl_bits.c
@@ -1005,8 +1005,13 @@ erts_new_bs_put_float(Process *c_p, Eterm arg, Uint num_bits, int flags)
if (is_float(arg)) {
FloatDef *fdp = (FloatDef*)(float_val(arg) + 1);
+#ifdef DOUBLE_MIDDLE_ENDIAN
+ a = fdp->fw[1];
+ b = fdp->fw[0];
+#else
a = fdp->fw[0];
b = fdp->fw[1];
+#endif
} else if (is_small(arg)) {
u.f64 = (double) signed_val(arg);
a = u.i32[0];
@@ -1015,8 +1020,13 @@ erts_new_bs_put_float(Process *c_p, Eterm arg, Uint num_bits, int flags)
if (big_to_double(arg, &u.f64) < 0) {
return 0;
}
+#ifdef DOUBLE_MIDDLE_ENDIAN
+ a = u.i32[1];
+ b = u.i32[0];
+#else
a = u.i32[0];
b = u.i32[1];
+#endif
} else {
return 0;
}
diff --git a/lib/erl_interface/aclocal.m4 b/lib/erl_interface/aclocal.m4
index 339a15a2bb..9c5bcd6dc6 100644
--- a/lib/erl_interface/aclocal.m4
+++ b/lib/erl_interface/aclocal.m4
@@ -59,6 +59,7 @@ AC_ARG_VAR(erl_xcomp_isysroot, [Absolute cross system root include path (only us
dnl Cross compilation variables
AC_ARG_VAR(erl_xcomp_bigendian, [big endian system: yes|no (only used when cross compiling)])
+AC_ARG_VAR(erl_xcomp_double_middle_endian, [double-middle-endian system: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_clock_gettime_correction, [clock_gettime() can be used for time correction: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_nptl, [have Native POSIX Thread Library: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_usable_sigusrx, [SIGUSR1 and SIGUSR2 can be used: yes|no (only used when cross compiling)])
@@ -606,6 +607,60 @@ ifelse([$5], , , [$5
fi
])
+dnl ----------------------------------------------------------------------
+dnl
+dnl AC_DOUBLE_MIDDLE_ENDIAN
+dnl
+dnl Checks whether doubles are represented in "middle-endian" format.
+dnl Sets ac_cv_double_middle_endian={no,yes,unknown} accordingly,
+dnl as well as DOUBLE_MIDDLE_ENDIAN.
+dnl
+dnl
+
+AC_DEFUN([AC_C_DOUBLE_MIDDLE_ENDIAN],
+[AC_CACHE_CHECK(whether double word ordering is middle-endian, ac_cv_c_double_middle_endian,
+[# It does not; compile a test program.
+AC_RUN_IFELSE(
+[AC_LANG_SOURCE([[int
+main(void)
+{
+ int i = 0;
+ int zero = 0;
+ union
+ {
+ double d;
+ char c[sizeof (double)];
+ } v;
+ v.d = 1.0;
+
+
+ while (i < sizeof(double) / 2)
+ {
+ if (v.c[i] != 0)
+ zero = 1;
+ ++i;
+ }
+ exit (zero);
+}
+]])],
+ [ac_cv_c_double_middle_endian=no],
+ [ac_cv_c_double_middle_endian=yes],
+ [ac_cv_c_double_middle=unknown])])
+case $ac_cv_c_double_middle_endian in
+ yes)
+ m4_default([$1],
+ [AC_DEFINE([DOUBLE_MIDDLE_ENDIAN], 1,
+ [Define to 1 if your processor stores the words in a double in
+ middle-endian format (like some ARMs).])]) ;;
+ no)
+ $2 ;;
+ *)
+ m4_default([$3],
+ [AC_MSG_ERROR([unknown double endianness
+presetting ac_cv_c_double_middle_endian=no (or yes) will help])]) ;;
+esac
+])# AC_C_DOUBLE_MIDDLE_ENDIAN
+
dnl ----------------------------------------------------------------------
dnl
@@ -1337,6 +1392,14 @@ if test "$ac_cv_c_bigendian" = "yes"; then
AC_DEFINE(ETHR_BIGENDIAN, 1, [Define if bigendian])
fi
+case X$erl_xcomp_double_middle_endian in
+ X) ;;
+ Xyes|Xno) ac_cv_c_double_middle_endian=$erl_xcomp_double_middle_endian;;
+ *) AC_MSG_ERROR([Bad erl_xcomp_double_middle_endian value: $erl_xcomp_double_middle_endian]);;
+esac
+
+AC_C_DOUBLE_MIDDLE_ENDIAN
+
AC_ARG_ENABLE(native-ethr-impls,
AS_HELP_STRING([--disable-native-ethr-impls],
[disable native ethread implementations]),
diff --git a/lib/odbc/aclocal.m4 b/lib/odbc/aclocal.m4
index 339a15a2bb..9c5bcd6dc6 100644
--- a/lib/odbc/aclocal.m4
+++ b/lib/odbc/aclocal.m4
@@ -59,6 +59,7 @@ AC_ARG_VAR(erl_xcomp_isysroot, [Absolute cross system root include path (only us
dnl Cross compilation variables
AC_ARG_VAR(erl_xcomp_bigendian, [big endian system: yes|no (only used when cross compiling)])
+AC_ARG_VAR(erl_xcomp_double_middle_endian, [double-middle-endian system: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_clock_gettime_correction, [clock_gettime() can be used for time correction: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_nptl, [have Native POSIX Thread Library: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_usable_sigusrx, [SIGUSR1 and SIGUSR2 can be used: yes|no (only used when cross compiling)])
@@ -606,6 +607,60 @@ ifelse([$5], , , [$5
fi
])
+dnl ----------------------------------------------------------------------
+dnl
+dnl AC_DOUBLE_MIDDLE_ENDIAN
+dnl
+dnl Checks whether doubles are represented in "middle-endian" format.
+dnl Sets ac_cv_double_middle_endian={no,yes,unknown} accordingly,
+dnl as well as DOUBLE_MIDDLE_ENDIAN.
+dnl
+dnl
+
+AC_DEFUN([AC_C_DOUBLE_MIDDLE_ENDIAN],
+[AC_CACHE_CHECK(whether double word ordering is middle-endian, ac_cv_c_double_middle_endian,
+[# It does not; compile a test program.
+AC_RUN_IFELSE(
+[AC_LANG_SOURCE([[int
+main(void)
+{
+ int i = 0;
+ int zero = 0;
+ union
+ {
+ double d;
+ char c[sizeof (double)];
+ } v;
+ v.d = 1.0;
+
+
+ while (i < sizeof(double) / 2)
+ {
+ if (v.c[i] != 0)
+ zero = 1;
+ ++i;
+ }
+ exit (zero);
+}
+]])],
+ [ac_cv_c_double_middle_endian=no],
+ [ac_cv_c_double_middle_endian=yes],
+ [ac_cv_c_double_middle=unknown])])
+case $ac_cv_c_double_middle_endian in
+ yes)
+ m4_default([$1],
+ [AC_DEFINE([DOUBLE_MIDDLE_ENDIAN], 1,
+ [Define to 1 if your processor stores the words in a double in
+ middle-endian format (like some ARMs).])]) ;;
+ no)
+ $2 ;;
+ *)
+ m4_default([$3],
+ [AC_MSG_ERROR([unknown double endianness
+presetting ac_cv_c_double_middle_endian=no (or yes) will help])]) ;;
+esac
+])# AC_C_DOUBLE_MIDDLE_ENDIAN
+
dnl ----------------------------------------------------------------------
dnl
@@ -1337,6 +1392,14 @@ if test "$ac_cv_c_bigendian" = "yes"; then
AC_DEFINE(ETHR_BIGENDIAN, 1, [Define if bigendian])
fi
+case X$erl_xcomp_double_middle_endian in
+ X) ;;
+ Xyes|Xno) ac_cv_c_double_middle_endian=$erl_xcomp_double_middle_endian;;
+ *) AC_MSG_ERROR([Bad erl_xcomp_double_middle_endian value: $erl_xcomp_double_middle_endian]);;
+esac
+
+AC_C_DOUBLE_MIDDLE_ENDIAN
+
AC_ARG_ENABLE(native-ethr-impls,
AS_HELP_STRING([--disable-native-ethr-impls],
[disable native ethread implementations]),
diff --git a/lib/wx/aclocal.m4 b/lib/wx/aclocal.m4
index 339a15a2bb..9c5bcd6dc6 100644
--- a/lib/wx/aclocal.m4
+++ b/lib/wx/aclocal.m4
@@ -59,6 +59,7 @@ AC_ARG_VAR(erl_xcomp_isysroot, [Absolute cross system root include path (only us
dnl Cross compilation variables
AC_ARG_VAR(erl_xcomp_bigendian, [big endian system: yes|no (only used when cross compiling)])
+AC_ARG_VAR(erl_xcomp_double_middle_endian, [double-middle-endian system: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_clock_gettime_correction, [clock_gettime() can be used for time correction: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_nptl, [have Native POSIX Thread Library: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_usable_sigusrx, [SIGUSR1 and SIGUSR2 can be used: yes|no (only used when cross compiling)])
@@ -606,6 +607,60 @@ ifelse([$5], , , [$5
fi
])
+dnl ----------------------------------------------------------------------
+dnl
+dnl AC_DOUBLE_MIDDLE_ENDIAN
+dnl
+dnl Checks whether doubles are represented in "middle-endian" format.
+dnl Sets ac_cv_double_middle_endian={no,yes,unknown} accordingly,
+dnl as well as DOUBLE_MIDDLE_ENDIAN.
+dnl
+dnl
+
+AC_DEFUN([AC_C_DOUBLE_MIDDLE_ENDIAN],
+[AC_CACHE_CHECK(whether double word ordering is middle-endian, ac_cv_c_double_middle_endian,
+[# It does not; compile a test program.
+AC_RUN_IFELSE(
+[AC_LANG_SOURCE([[int
+main(void)
+{
+ int i = 0;
+ int zero = 0;
+ union
+ {
+ double d;
+ char c[sizeof (double)];
+ } v;
+ v.d = 1.0;
+
+
+ while (i < sizeof(double) / 2)
+ {
+ if (v.c[i] != 0)
+ zero = 1;
+ ++i;
+ }
+ exit (zero);
+}
+]])],
+ [ac_cv_c_double_middle_endian=no],
+ [ac_cv_c_double_middle_endian=yes],
+ [ac_cv_c_double_middle=unknown])])
+case $ac_cv_c_double_middle_endian in
+ yes)
+ m4_default([$1],
+ [AC_DEFINE([DOUBLE_MIDDLE_ENDIAN], 1,
+ [Define to 1 if your processor stores the words in a double in
+ middle-endian format (like some ARMs).])]) ;;
+ no)
+ $2 ;;
+ *)
+ m4_default([$3],
+ [AC_MSG_ERROR([unknown double endianness
+presetting ac_cv_c_double_middle_endian=no (or yes) will help])]) ;;
+esac
+])# AC_C_DOUBLE_MIDDLE_ENDIAN
+
dnl ----------------------------------------------------------------------
dnl
@@ -1337,6 +1392,14 @@ if test "$ac_cv_c_bigendian" = "yes"; then
AC_DEFINE(ETHR_BIGENDIAN, 1, [Define if bigendian])
fi
+case X$erl_xcomp_double_middle_endian in
+ X) ;;
+ Xyes|Xno) ac_cv_c_double_middle_endian=$erl_xcomp_double_middle_endian;;
+ *) AC_MSG_ERROR([Bad erl_xcomp_double_middle_endian value: $erl_xcomp_double_middle_endian]);;
+esac
+
+AC_C_DOUBLE_MIDDLE_ENDIAN
+
AC_ARG_ENABLE(native-ethr-impls,
AS_HELP_STRING([--disable-native-ethr-impls],
[disable native ethread implementations]),
diff --git a/xcomp/README.md b/xcomp/README.md
index 2d79107283..98e71d5962 100644
--- a/xcomp/README.md
+++ b/xcomp/README.md
@@ -430,6 +430,14 @@ When a variable has been set, no warning will be issued.
`configure` will fail unless this variable is set. Since no default
value is used, `configure` will try to figure this out automatically.
+* `erl_xcomp_double_middle` - `yes|no`. No default. If `yes`, the
+ target system must have doubles in "middle-endian" format. If
+ `no`, it has "regular" endianness. This can often be automatically
+ detected, but not always. If not automatically detected,
+ `configure` will fail unless this variable is set. Since no
+ default value is used, `configure` will try to figure this out
+ automatically.
+
* `erl_xcomp_clock_gettime_cpu_time` - `yes|no`. Defaults to `no`. If `yes`,
the target system must have a working `clock_gettime()` implementation
that can be used for retrieving process CPU time.
diff --git a/xcomp/erl-xcomp-TileraMDE2.0-tilepro.conf b/xcomp/erl-xcomp-TileraMDE2.0-tilepro.conf
index f9fff0fa8e..287cb787d9 100644
--- a/xcomp/erl-xcomp-TileraMDE2.0-tilepro.conf
+++ b/xcomp/erl-xcomp-TileraMDE2.0-tilepro.conf
@@ -187,6 +187,15 @@ erl_xcomp_sysroot="$TILERA_ROOT/tile"
# value is used, `configure' will try to figure this out automatically.
#erl_xcomp_bigendian=
+# * `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.
diff --git a/xcomp/erl-xcomp-avr32-atmel-linux-gnu.conf b/xcomp/erl-xcomp-avr32-atmel-linux-gnu.conf
index 31f5306c1a..9e553e6217 100644
--- a/xcomp/erl-xcomp-avr32-atmel-linux-gnu.conf
+++ b/xcomp/erl-xcomp-avr32-atmel-linux-gnu.conf
@@ -190,6 +190,15 @@ erl_xcomp_sysroot="$ATMEL_SYSROOT_AVR32"
# value is used, `configure' will try to figure this out automatically.
#erl_xcomp_bigendian=
+# * `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.
diff --git a/xcomp/erl-xcomp-mips-linux.conf b/xcomp/erl-xcomp-mips-linux.conf
index 3ac057bb4c..2195b7d6e9 100644
--- a/xcomp/erl-xcomp-mips-linux.conf
+++ b/xcomp/erl-xcomp-mips-linux.conf
@@ -187,6 +187,15 @@ CFLAGS=-Os
# value is used, `configure' will try to figure this out automatically.
#erl_xcomp_bigendian=
+# * `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.
diff --git a/xcomp/erl-xcomp-vars.sh b/xcomp/erl-xcomp-vars.sh
index d9972eb3db..168b25262a 100644
--- a/xcomp/erl-xcomp-vars.sh
+++ b/xcomp/erl-xcomp-vars.sh
@@ -26,4 +26,4 @@
# and precious variables in $ERL_TOP/erts/aclocal.m4.
#
-erl_xcomp_vars="erl_xcomp_sysroot erl_xcomp_isysroot erl_xcomp_bigendian erl_xcomp_linux_clock_gettime_correction erl_xcomp_linux_nptl erl_xcomp_linux_usable_sigusrx erl_xcomp_linux_usable_sigaltstack erl_xcomp_poll erl_xcomp_kqueue erl_xcomp_putenv_copy erl_xcomp_reliable_fpe erl_xcomp_getaddrinfo erl_xcomp_gethrvtime_procfs_ioctl erl_xcomp_clock_gettime_cpu_time erl_xcomp_after_morecore_hook erl_xcomp_dlsym_brk_wrappers"
+erl_xcomp_vars="erl_xcomp_sysroot erl_xcomp_isysroot erl_xcomp_bigendian erl_xcomp_double_middle_endian erl_xcomp_linux_clock_gettime_correction erl_xcomp_linux_nptl erl_xcomp_linux_usable_sigusrx erl_xcomp_linux_usable_sigaltstack erl_xcomp_poll erl_xcomp_kqueue erl_xcomp_putenv_copy erl_xcomp_reliable_fpe erl_xcomp_getaddrinfo erl_xcomp_gethrvtime_procfs_ioctl erl_xcomp_clock_gettime_cpu_time erl_xcomp_after_morecore_hook erl_xcomp_dlsym_brk_wrappers"
diff --git a/xcomp/erl-xcomp-vxworks_ppc32.conf b/xcomp/erl-xcomp-vxworks_ppc32.conf
index ed8305ea93..bea4b3e374 100644
--- a/xcomp/erl-xcomp-vxworks_ppc32.conf
+++ b/xcomp/erl-xcomp-vxworks_ppc32.conf
@@ -187,6 +187,15 @@ AR="$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.
diff --git a/xcomp/erl-xcomp-x86_64-saf-linux-gnu.conf b/xcomp/erl-xcomp-x86_64-saf-linux-gnu.conf
index f645ddbd96..de9118ae30 100644
--- a/xcomp/erl-xcomp-x86_64-saf-linux-gnu.conf
+++ b/xcomp/erl-xcomp-x86_64-saf-linux-gnu.conf
@@ -187,6 +187,15 @@ erl_xcomp_after_morecore_hook=yes
# value is used, `configure' will try to figure this out automatically.
#erl_xcomp_bigendian=
+# * `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.
diff --git a/xcomp/erl-xcomp.conf.template b/xcomp/erl-xcomp.conf.template
index eb331ffe92..c215f0fb13 100644
--- a/xcomp/erl-xcomp.conf.template
+++ b/xcomp/erl-xcomp.conf.template
@@ -187,6 +187,15 @@
# value is used, `configure' will try to figure this out automatically.
#erl_xcomp_bigendian=
+# * `erl_xcomp_double_middle` - `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.