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Add -Wno-declaration-after-statement to KERNELCPPFLAGS

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Disable the warnings regarding ISO C90 forbidding mixed
declarations and code.  While this functionality was
introduced as part of C99 gcc does allow this in C90
mode as an extension.

https://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed-Declarations

Allowing this usage helps minimize the changes required
when porting patches from OpenZFS.  The downside here is
that this functionality is specific to gcc.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #5686
This commit is contained in:
Brian Behlendorf 2017-01-28 12:12:25 -08:00 committed by GitHub
parent 721ed0ee86
commit 3130b84e94
1 changed files with 1 additions and 0 deletions
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config/kernel.m4
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@ -123,6 +123,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
dnl # compiler options are added by the kernel build system.
KERNELCPPFLAGS="$KERNELCPPFLAGS -Wno-declaration-after-statement"
KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_BOOL_COMPARE"
KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"