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Revision d1722a27

IDd1722a27f552a22561104210e0afad4577878e53

Added by Alexandre Raymond almost 10 years ago

configure: Fix check for fdatasync()

Under Darwin, a symbol exists for the fdatasync() function, so that our
link test succeeds. However _POSIX_SYNCHRONIZED_IO is set to '-1'.

According to POSIX:2008, a value of -1 means the feature is not supported.
A value of 0 means supported at compilation time, and a value greater 0
means supported at both compilation and run time.

Enable fdatasync() only if _POSIX_SYNCHRONIZED_IO is '>0'.

Signed-off-by: Alexandre Raymond <>
Signed-off-by: Andreas Färber <>

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