diff options
| author | Brian Behlendorf <[email protected]> | 2013-01-10 16:09:31 -0800 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2013-01-10 16:09:39 -0800 |
| commit | e191b54ecfbd2af619d5cb4b3a0f298305c2145a (patch) | |
| tree | bf9df5d5985e44a3cb722f9af77632c36ebce15a /config/kernel-blk-queue-io-opt.m4 | |
| parent | 9566fb1a7b360c44e66475f933ebde106d9a0f0d (diff) | |
Only use gcc -Wunused-but-set-variable when available
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 <[email protected]>
Closes #1004
Diffstat (limited to 'config/kernel-blk-queue-io-opt.m4')
| -rw-r--r-- | config/kernel-blk-queue-io-opt.m4 | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/config/kernel-blk-queue-io-opt.m4 b/config/kernel-blk-queue-io-opt.m4 index 4ea94e1cd..fb9b6841b 100644 --- a/config/kernel-blk-queue-io-opt.m4 +++ b/config/kernel-blk-queue-io-opt.m4 @@ -6,7 +6,7 @@ dnl # AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_IO_OPT], [ AC_MSG_CHECKING([whether blk_queue_io_opt() is available]) tmp_flags="$EXTRA_KCFLAGS" - EXTRA_KCFLAGS="-Wno-unused-but-set-variable" + EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}" ZFS_LINUX_TRY_COMPILE([ #include <linux/blkdev.h> ],[ |