[mirror_zfs-debian.git] / config / always-no-bool-compare.m4

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="$saved_flags"
	AC_SUBST([NO_BOOL_COMPARE])
])
Commit	Line	Data
e10b0808 AX	1	dnl #
	2	dnl # Check if gcc supports -Wno-bool-compare option.
	3	dnl #
	4	dnl # We actually invoke gcc with the -Wbool-compare option
	5	dnl # and infer the 'no-' version does or doesn't exist based upon
	6	dnl # the results. This is required because when checking any of
	7	dnl # no- prefixed options gcc always returns success.
	8	dnl #
	9	AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_NO_BOOL_COMPARE], [
	10	AC_MSG_CHECKING([for -Wno-bool-compare support])
	11
	12	saved_flags="$CFLAGS"
	13	CFLAGS="$CFLAGS -Wbool-compare"
	14
	15	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])],
	16	[
	17	NO_BOOL_COMPARE=-Wno-bool-compare
	18	AC_MSG_RESULT([yes])
	19	],
	20	[
	21	NO_BOOL_COMPARE=
	22	AC_MSG_RESULT([no])
	23	])
	24
	25	CFLAGS="$saved_flags"
	26	AC_SUBST([NO_BOOL_COMPARE])
	27	])