Revision d1722a27 configure

b/configure
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fdatasync=no
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cat > $TMPC << EOF
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#include <unistd.h>
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int main(void) { return fdatasync(0); }
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int main(void) {
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#if defined(_POSIX_SYNCHRONIZED_IO) && _POSIX_SYNCHRONIZED_IO > 0
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return fdatasync(0);
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#else
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#abort Not supported
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#endif
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}
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EOF
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if compile_prog "" "" ; then
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    fdatasync=yes

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