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Checks whether right shift extends the sign bit.

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Patch by Thomas Wouters <thomas@xs4all.net> with small changes of mine
(in main(), use return instead of exit).

Closes patch #100832
(but I can't assign it to myself, nor close it -- sorry)
This commit is contained in:
Vladimir Marangozov 2000-07-12 03:02:16 +00:00
parent bd9848d02f
commit 9a5a5d1cb0
1 changed files with 13 additions and 0 deletions
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13
configure.in
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@ -1136,6 +1136,19 @@ AC_MSG_RESULT($usable_wchar_t)
# check for endianness
AC_C_BIGENDIAN
# Check whether right shifting a negative integer extends the sign bit
# or fills with zeros (like the Cray J90, according to Tim Peters).
AC_MSG_CHECKING(whether right shift extends the sign bit)
AC_TRY_RUN([
int main()
{
return ((-1)>>3 == -1) ? 1 : 0;
}
],
[AC_DEFINE(SIGNED_RIGHT_SHIFT_ZERO_FILLS)
AC_MSG_RESULT(yes)],
[AC_MSG_RESULT(no)])
# THIS MUST BE LAST, IT CAN BREAK OTHER TESTS!
# Add sys/socket.h to confdefs.h
cat >> confdefs.h <<\EOF