Configure changes to enable cross compiling.

From-SVN: r49378

libffi/ChangeLog

+2002-01-31  Anthony Green  <green@redhat.com>
+
+	* configure: Rebuilt.
+	* configure.in: Replace CHECK_SIZEOF and endian tests with
+	cross-compiler friendly macros.
+	* aclocal.m4 (AC_COMPILE_CHECK_SIZEOF, AC_C_BIGENDIAN_CROSS): New
+	macros.
+
 2002-01-18  David Edelsohn  <edelsohn@gnu.org>
 
 	* src/powerpc/darwin.S (_ffi_call_AIX): New.

libffi/aclocal.m4

@@ -19,6 +19,102 @@ AC_DEFUN([AC_PROG_LIBTOOL],)
 AC_SUBST(LIBTOOL)
 ])
 
+AC_DEFUN([AC_COMPILE_CHECK_SIZEOF],
+[changequote(<<, >>)dnl
+dnl The name to #define.
+define(<<AC_TYPE_NAME>>, translit(sizeof_$1, [a-z *], [A-Z_P]))dnl
+dnl The cache variable name.
+define(<<AC_CV_NAME>>, translit(ac_cv_sizeof_$1, [ *], [_p]))dnl
+changequote([, ])dnl
+AC_MSG_CHECKING(size of $1)
+AC_CACHE_VAL(AC_CV_NAME,
+[for ac_size in 4 8 1 2 16 12 $2 ; do # List sizes in rough order of prevalence.
+  AC_TRY_COMPILE([#include "confdefs.h"
+#include <sys/types.h>
+$2
+], [switch (0) case 0: case (sizeof ($1) == $ac_size):;], AC_CV_NAME=$ac_size)
+  if test x$AC_CV_NAME != x ; then break; fi
+done
+])
+if test x$AC_CV_NAME = x ; then
+  AC_MSG_ERROR([cannot determine a size for $1])
+fi
+AC_MSG_RESULT($AC_CV_NAME)
+AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [The number of bytes in type $1])
+undefine([AC_TYPE_NAME])dnl
+undefine([AC_CV_NAME])dnl
+])
+
+AC_DEFUN([AC_C_BIGENDIAN_CROSS],
+[AC_CACHE_CHECK(whether byte ordering is bigendian, ac_cv_c_bigendian,
+[ac_cv_c_bigendian=unknown
+# See if sys/param.h defines the BYTE_ORDER macro.
+AC_TRY_COMPILE([#include <sys/types.h>
+#include <sys/param.h>], [
+#if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
+ bogus endian macros
+#endif], [# It does; now see whether it defined to BIG_ENDIAN or not.
+AC_TRY_COMPILE([#include <sys/types.h>
+#include <sys/param.h>], [
+#if BYTE_ORDER != BIG_ENDIAN
+ not big endian
+#endif], ac_cv_c_bigendian=yes, ac_cv_c_bigendian=no)])
+if test $ac_cv_c_bigendian = unknown; then
+AC_TRY_RUN([main () {
+  /* Are we little or big endian?  From Harbison&Steele.  */
+  union
+  {
+    long l;
+    char c[sizeof (long)];
+  } u;
+  u.l = 1;
+  exit (u.c[sizeof (long) - 1] == 1);
+}], ac_cv_c_bigendian=no, ac_cv_c_bigendian=yes,
+[ echo $ac_n "cross-compiling... " 2>&AC_FD_MSG ])
+fi])
+if test $ac_cv_c_bigendian = unknown; then
+AC_MSG_CHECKING(to probe for byte ordering)
+[
+cat >conftest.c <<EOF
+short ascii_mm[] = { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };
+short ascii_ii[] = { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 };
+void _ascii() { char* s = (char*) ascii_mm; s = (char*) ascii_ii; }
+short ebcdic_ii[] = { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 };
+short ebcdic_mm[] = { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 };
+void _ebcdic() { char* s = (char*) ebcdic_mm; s = (char*) ebcdic_ii; }
+int main() { _ascii (); _ebcdic (); return 0; }
+EOF
+] if test -f conftest.c ; then
+     if ${CC-cc} ${CFLAGS} conftest.c -o conftest.o && test -f conftest.o ; then
+        if test `grep -l BIGenDianSyS conftest.o` ; then
+           echo $ac_n ' big endian probe OK, ' 1>&AC_FD_MSG
+           ac_cv_c_bigendian=yes
+        fi
+        if test `grep -l LiTTleEnDian conftest.o` ; then
+           echo $ac_n ' little endian probe OK, ' 1>&AC_FD_MSG
+           if test $ac_cv_c_bigendian = yes ; then
+            ac_cv_c_bigendian=unknown;
+           else
+            ac_cv_c_bigendian=no
+           fi
+        fi
+        echo $ac_n 'guessing bigendian ...  ' >&AC_FD_MSG
+     fi
+  fi
+AC_MSG_RESULT($ac_cv_c_bigendian)
+fi
+if test $ac_cv_c_bigendian = yes; then
+  AC_DEFINE(WORDS_BIGENDIAN, 1, [whether byteorder is bigendian])
+  BYTEORDER=4321
+else
+  BYTEORDER=1234
+fi
+AC_DEFINE_UNQUOTED(BYTEORDER, $BYTEORDER, [1234 = LIL_ENDIAN, 4321 = BIGENDIAN])
+if test $ac_cv_c_bigendian = unknown; then
+  AC_MSG_ERROR(unknown endianess - sorry, please pre-set ac_cv_c_bigendian)
+fi
+])
+
 # Like AC_CONFIG_HEADER, but automatically create stamp file.
 
 AC_DEFUN(AM_CONFIG_HEADER,

libffi/configure.in

@@ -84,16 +84,16 @@ AC_CHECK_FUNCS(memcpy)
 AC_FUNC_ALLOCA
 
 dnl AC_CHECK_SIZEOF(char)
-AC_CHECK_SIZEOF(short)
-AC_CHECK_SIZEOF(int)
-AC_CHECK_SIZEOF(long)
-AC_CHECK_SIZEOF(long long)
-AC_CHECK_SIZEOF(float)
-AC_CHECK_SIZEOF(double)
-AC_CHECK_SIZEOF(long double)
-
-AC_CHECK_SIZEOF(void *)
-AC_C_BIGENDIAN
+AC_COMPILE_CHECK_SIZEOF(short)
+AC_COMPILE_CHECK_SIZEOF(int)
+AC_COMPILE_CHECK_SIZEOF(long)
+AC_COMPILE_CHECK_SIZEOF(long long)
+AC_COMPILE_CHECK_SIZEOF(float)
+AC_COMPILE_CHECK_SIZEOF(double)
+AC_COMPILE_CHECK_SIZEOF(long double)
+
+AC_COMPILE_CHECK_SIZEOF(void *)
+AC_C_BIGENDIAN_CROSS
 
 AC_SUBST(TARGET)
 AC_SUBST(TARGETDIR)