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authorH.J. Lu <hjl@lucon.org>2002-12-16 19:58:06 +0000
committerH.J. Lu <hjl@lucon.org>2002-12-16 19:58:06 +0000
commit46fa84a9000a4766af815867b1aecb9d48316f64 (patch)
tree2bac613b8a61a7e6fb734253da3f8038f510329a /config/accross.m4
parent66c3405c0ada3c6ce79ee073dfbc11b848615960 (diff)
downloadgdb-46fa84a9000a4766af815867b1aecb9d48316f64.tar.gz
2002-11-23 H.J. Lu <hjl@gnu.org>
* accross.m4: New.
Diffstat (limited to 'config/accross.m4')
-rw-r--r--config/accross.m498
1 files changed, 98 insertions, 0 deletions
diff --git a/config/accross.m4 b/config/accross.m4
new file mode 100644
index 00000000000..a4cebf692e1
--- /dev/null
+++ b/config/accross.m4
@@ -0,0 +1,98 @@
+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])
+ AC_DEFINE(HOST_WORDS_BIG_ENDIAN, 1,
+ [Define if the host machine stores words of multi-word integers in
+ big-endian order.])
+ 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
+])