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Checks whether right shift extends the sign bit.
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)
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configure.in
13
configure.in
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@ -1136,6 +1136,19 @@ AC_MSG_RESULT($usable_wchar_t)
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# check for endianness
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AC_C_BIGENDIAN
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# Check whether right shifting a negative integer extends the sign bit
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# or fills with zeros (like the Cray J90, according to Tim Peters).
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AC_MSG_CHECKING(whether right shift extends the sign bit)
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AC_TRY_RUN([
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int main()
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{
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return ((-1)>>3 == -1) ? 1 : 0;
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}
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],
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[AC_DEFINE(SIGNED_RIGHT_SHIFT_ZERO_FILLS)
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AC_MSG_RESULT(yes)],
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[AC_MSG_RESULT(no)])
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# THIS MUST BE LAST, IT CAN BREAK OTHER TESTS!
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# Add sys/socket.h to confdefs.h
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cat >> confdefs.h <<\EOF
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