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-rw-r--r--aclocal.m4108
1 files changed, 107 insertions, 1 deletions
diff --git a/aclocal.m4 b/aclocal.m4
index 339a15a2bb..b1cf1fe404 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1,7 +1,7 @@
dnl
dnl %CopyrightBegin%
dnl
-dnl Copyright Ericsson AB 1998-2011. All Rights Reserved.
+dnl Copyright Ericsson AB 1998-2012. All Rights Reserved.
dnl
dnl The contents of this file are subject to the Erlang Public License,
dnl Version 1.1, (the "License"); you may not use this file except in
@@ -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 +607,103 @@ 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([[#include <stdlib.h>
+
+int
+main(void)
+{
+ int i = 0;
+ int zero = 0;
+ int bigendian;
+ int zero_index = 0;
+
+ union
+ {
+ long int l;
+ char c[sizeof (long int)];
+ } u;
+
+ /* we'll use the one with 32-bit words */
+ union
+ {
+ double d;
+ unsigned int c[2];
+ } vint;
+
+ union
+ {
+ double d;
+ unsigned long c[2];
+ } vlong;
+
+ union
+ {
+ double d;
+ unsigned short c[2];
+ } vshort;
+
+
+ /* Are we little or big endian? From Harbison&Steele. */
+ u.l = 1;
+ bigendian = (u.c[sizeof (long int) - 1] == 1);
+
+ zero_index = bigendian ? 1 : 0;
+
+ vint.d = 1.0;
+ vlong.d = 1.0;
+ vshort.d = 1.0;
+
+ if (sizeof(unsigned int) == 4)
+ {
+ if (vint.c[zero_index] != 0)
+ zero = 1;
+ }
+ else if (sizeof(unsigned long) == 4)
+ {
+ if (vlong.c[zero_index] != 0)
+ zero = 1;
+ }
+ else if (sizeof(unsigned short) == 4)
+ {
+ if (vshort.c[zero_index] != 0)
+ zero = 1;
+ }
+
+ 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([$3],
+ [AC_MSG_WARN([unknown double endianness
+presetting ac_cv_c_double_middle_endian=no (or yes) will help])]) ;;
+esac
+])# AC_C_DOUBLE_MIDDLE_ENDIAN
+
dnl ----------------------------------------------------------------------
dnl
@@ -1337,6 +1435,14 @@ if test "$ac_cv_c_bigendian" = "yes"; then
AC_DEFINE(ETHR_BIGENDIAN, 1, [Define if bigendian])
fi
+case X$erl_xcomp_double_middle_endian in
+ X) ;;
+ Xyes|Xno|Xunknown) ac_cv_c_double_middle_endian=$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]),