X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=sim%2Fucsim%2Fconfigure.in;fp=sim%2Fucsim%2Fconfigure.in;h=c2278950625eb66080fefc05c1640c8d8137560b;hb=a446a63f24e77a9806413bada4604eb098f06122;hp=339cdc0acafa61b5314b5aa11109cd3336c4d0d0;hpb=85cb1c7d9f34e31311e7a2d7fa1d47aeb3a11c4e;p=fw%2Fsdcc

diff --git a/sim/ucsim/configure.in b/sim/ucsim/configure.in
index 339cdc0a..c2278950 100644
--- a/sim/ucsim/configure.in
+++ b/sim/ucsim/configure.in
@@ -429,18 +429,77 @@ if test "$CC" = "i586-mingw32msvc-gcc"; then
   ac_cv_sizeof_long_long=4
 fi
 
-if test "$cross_compiling" = "no"
-then
-    AC_C_BIGENDIAN
-else
-#echo "CROSS ENDIAN"
-    if $CXX -v 2>&1|grep "mingw" >/dev/null 2>&1; then
-        ac_cv_c_bigendian=no
-    else
-        : # FIXME
-    fi
-#echo "CROSS ENDIAN DONE"
+# SDCC_BUILD_BIGENDIAN ([ACTION-IF-TRUE], [ACTION-IF-FALSE], [ACTION-IF-UNKNOWN])
+# -------------------------------------------------------------------------
+AC_DEFUN([SDCC_BUILD_BIGENDIAN],
+[AC_CACHE_CHECK(whether host machine byte ordering is bigendian, sdcc_cv_build_bigendian,
+[# See if sys/param.h defines the BYTE_ORDER macro.
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
+#include <sys/param.h>
+],
+[#if  ! (defined BYTE_ORDER && defined BIG_ENDIAN && defined LITTLE_ENDIAN \
+	&& BYTE_ORDER && BIG_ENDIAN && LITTLE_ENDIAN)
+ bogus endian macros
+#endif
+])],
+[# It does; now see whether it defined to BIG_ENDIAN or not.
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
+#include <sys/param.h>
+], [#if BYTE_ORDER != BIG_ENDIAN
+ not big endian
+#endif
+])], [sdcc_cv_build_bigendian=yes], [sdcc_cv_build_bigendian=no])],
+[# It does not; compile a test program.
+AC_RUN_IFELSE(
+[AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT], [[
+  /* Are we little or big endian?  From Harbison&Steele.  */
+  union
+  {
+    long int l;
+    char c[sizeof (long int)];
+  } u;
+  u.l = 1;
+  return u.c[sizeof (long int) - 1] == 1;
+]])],
+	      [sdcc_cv_build_bigendian=no],
+	      [sdcc_cv_build_bigendian=yes],
+[# try to guess the endianness by grepping values into an object file
+  sdcc_cv_build_bigendian=unknown
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[[short int ascii_mm[] = { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };
+short int ascii_ii[] = { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 };
+void _ascii () { char *s = (char *) ascii_mm; s = (char *) ascii_ii; }
+short int ebcdic_ii[] = { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 };
+short int ebcdic_mm[] = { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 };
+void _ebcdic () { char *s = (char *) ebcdic_mm; s = (char *) ebcdic_ii; }]],
+[[ _ascii (); _ebcdic (); ]])],
+[if grep BIGenDianSyS conftest.$ac_objext >/dev/null ; then
+  sdcc_cv_build_bigendian=yes
 fi
+if grep LiTTleEnDian conftest.$ac_objext >/dev/null ; then
+  if test "$sdcc_cv_build_bigendian" = unknown; then
+    sdcc_cv_build_bigendian=no
+  else
+    # finding both strings is unlikely to happen, but who knows?
+    sdcc_cv_build_bigendian=unknown
+  fi
+fi])])])])
+case $sdcc_cv_build_bigendian in
+  yes)
+    m4_default([$1],
+      [AC_DEFINE([BUILD_WORDS_BIGENDIAN], 1,
+	[Define to 1 if your processor stores words with the most significant
+	 byte first (like Motorola and SPARC, unlike Intel and VAX).])]) ;;
+  no)
+    $2 ;;
+  *)
+    m4_default([$3],
+      [AC_MSG_ERROR([unknown endianness
+presetting sdcc_cv_build_bigendian=no (or yes) will help])]) ;;
+esac
+])# SDCC_BUILD_BIGENDIAN
+
+SDCC_BUILD_BIGENDIAN
 
 AC_CACHE_CHECK(whether preprocessor accepts -MM or -M,ucsim_cv_MM,
 echo "#include <stdio.h>" >_test_.c