e191b54ecf
Certain versions of gcc generate an 'unrecognized command line option' error message when -Wunused-but-set-variable is used unconditionally. This in turn can cause several of the autoconf tests to misdetect an interface. Now, the use of -Wunused-but-set-variable in the autoconf tests was introduced by commit b9c59ec8 to address a gcc 4.6 compatibility problem. So we really only need to pass this option for version of gcc which are known to support it. Therefore, the tests have been updated to use the result of the existing ZFS_AC_CONFIG_ALWAYS_NO_UNUSED_BUT_SET_VARIABLE which determines if gcc supports this option. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1004
25 lines
641 B
Plaintext
25 lines
641 B
Plaintext
dnl #
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dnl # 2.6.30 API change
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dnl # The blk_queue_io_opt() function was added to indicate the optimal
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dnl # I/O size for the device.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_IO_OPT], [
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AC_MSG_CHECKING([whether blk_queue_io_opt() is available])
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tmp_flags="$EXTRA_KCFLAGS"
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EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/blkdev.h>
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],[
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struct request_queue *q = NULL;
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unsigned int opt = 1;
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(void) blk_queue_io_opt(q, opt);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_BLK_QUEUE_IO_OPT, 1,
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[blk_queue_io_opt() is available])
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],[
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AC_MSG_RESULT(no)
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])
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EXTRA_KCFLAGS="$tmp_flags"
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])
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