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Disable gcc bool-compare warning 

As of gcc version 5.1.1 a new boolean comparison warning has been
introduced.  This warning is harmless but is triggered several places
in the ZFS code base.  Because warnings are promoted to errors when
building with debugging enabled it is necessary to disable the warning
when using versions of gcc which automatically enabling this check.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf 2015-07-13 12:30:02 -07:00
parent 5970eb3d60
commit c2d17fd891
4 changed files with 30 additions and 0 deletions
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1
config/Rules.am
View File

@ -3,6 +3,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h
AM_LIBTOOLFLAGS = --silent
AM_CFLAGS = ${DEBUG_CFLAGS} -Wall -Wstrict-prototypes
AM_CFLAGS += ${NO_UNUSED_BUT_SET_VARIABLE}
AM_CFLAGS += ${NO_BOOL_COMPARE}
AM_CFLAGS += -fno-strict-aliasing
AM_CPPFLAGS = -D_GNU_SOURCE -D__EXTENSIONS__ -D_REENTRANT
AM_CPPFLAGS += -D_POSIX_PTHREAD_SEMANTICS -D_FILE_OFFSET_BITS=64

27
config/always-no-bool-compare.m4 Normal file
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@ -0,0 +1,27 @@
dnl #
dnl # Check if gcc supports -Wno-bool-compare option.
dnl #
dnl # We actually invoke gcc with the -Wbool-compare option
dnl # and infer the 'no-' version does or doesn't exist based upon
dnl # the results. This is required because when checking any of
dnl # no- prefixed options gcc always returns success.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_NO_BOOL_COMPARE], [
AC_MSG_CHECKING([for -Wno-bool-compare support])
saved_flags="$CFLAGS"
CFLAGS="$CFLAGS -Wbool-compare"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])],
[
NO_BOOL_COMPARE=-Wno-bool-compare
AC_MSG_RESULT([yes])
],
[
NO_BOOL_COMPARE=
AC_MSG_RESULT([no])
])
CFLAGS="$saved_flags"
AC_SUBST([NO_BOOL_COMPARE])
])

1
config/kernel.m4
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@ -108,6 +108,7 @@ 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 $NO_UNUSED_BUT_SET_VARIABLE"
KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_BOOL_COMPARE"
KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""

1
config/zfs-build.m4
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@ -62,6 +62,7 @@ AC_DEFUN([ZFS_AC_DEBUG_DMU_TX], [
AC_DEFUN([ZFS_AC_CONFIG_ALWAYS], [
ZFS_AC_CONFIG_ALWAYS_NO_UNUSED_BUT_SET_VARIABLE
ZFS_AC_CONFIG_ALWAYS_NO_BOOL_COMPARE
])
AC_DEFUN([ZFS_AC_CONFIG], [