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Add explanatory comment for r327622: clang 6.0.0 and higher warn about

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the ACPI_ROOT_OBJECT and ACPI_TO_POINTER macros from acpica's actypes.h
header, that they use arithmetic on a null pointer treated as a cast
from integer to pointer, which is a GNU extension.  We turn off the
warning, because this is in contributed code.

Requested by:	rakuco
This commit is contained in:
Dimitry Andric 2018-01-08 18:42:40 +00:00
parent 687571a78b
commit de82c38b72
1 changed files with 6 additions and 0 deletions
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6
usr.sbin/acpi/acpidb/Makefile
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@ -81,6 +81,12 @@ LIBADD= pthread
.include <bsd.prog.mk>
# clang 6.0.0 and higher warn about the ACPI_ROOT_OBJECT and
# ACPI_TO_POINTER macros from sys/contrib/dev/acpica/include/actypes.h,
# that they use arithmetic on a null pointer treated as a cast from
# integer to pointer, which is a GNU extension.
#
# Turn off the warning, because this is in contributed code.
.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 60000
CWARNFLAGS+= -Wno-null-pointer-arithmetic
.endif