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config: add and use KERNEL_CC check for -Wno-format-zero-length

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Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ivan Shapovalov <intelfx@intelfx.name>
Closes #16997
This commit is contained in:
Ivan Shapovalov 2024-10-21 09:00:39 +03:00 committed by Brian Behlendorf
parent 92579489e0
commit c00c3e33bb
3 changed files with 30 additions and 1 deletions
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28
config/always-compiler-options.m4
View File

@ -155,6 +155,34 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_FORMAT_ZERO_LENGTH], [
AC_SUBST([NO_FORMAT_ZERO_LENGTH])
])
dnl #
dnl # Check if kernel cc supports -Wno-format-zero-length option.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_KERNEL_CC_NO_FORMAT_ZERO_LENGTH], [
saved_cc="$CC"
AS_IF(
[ test -n "$KERNEL_CC" ], [ CC="$KERNEL_CC" ],
[ test -n "$KERNEL_LLVM" ], [ CC="clang" ],
[ CC="gcc" ]
)
AC_MSG_CHECKING([whether $CC supports -Wno-format-zero-length])
saved_flags="$CFLAGS"
CFLAGS="$CFLAGS -Werror -Wno-format-zero-length"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
KERNEL_NO_FORMAT_ZERO_LENGTH=-Wno-format-zero-length
AC_MSG_RESULT([yes])
], [
KERNEL_NO_FORMAT_ZERO_LENGTH=
AC_MSG_RESULT([no])
])
CC="$saved_cc"
CFLAGS="$saved_flags"
AC_SUBST([KERNEL_NO_FORMAT_ZERO_LENGTH])
])
dnl #
dnl # Check if cc supports -Wno-clobbered option.
dnl #

1
config/zfs-build.m4
View File

@ -256,6 +256,7 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS], [
ZFS_AC_CONFIG_ALWAYS_CC_FRAME_LARGER_THAN
ZFS_AC_CONFIG_ALWAYS_CC_NO_FORMAT_TRUNCATION
ZFS_AC_CONFIG_ALWAYS_CC_NO_FORMAT_ZERO_LENGTH
ZFS_AC_CONFIG_ALWAYS_KERNEL_CC_NO_FORMAT_ZERO_LENGTH
ZFS_AC_CONFIG_ALWAYS_CC_FORMAT_OVERFLOW
ZFS_AC_CONFIG_ALWAYS_CC_NO_OMIT_FRAME_POINTER
ZFS_AC_CONFIG_ALWAYS_CC_NO_IPA_SRA

2
module/Kbuild.in
View File

@ -4,7 +4,7 @@
ZFS_MODULE_CFLAGS += -std=gnu99 -Wno-declaration-after-statement
ZFS_MODULE_CFLAGS += -Wmissing-prototypes
ZFS_MODULE_CFLAGS += @KERNEL_DEBUG_CFLAGS@ @NO_FORMAT_ZERO_LENGTH@
ZFS_MODULE_CFLAGS += @KERNEL_DEBUG_CFLAGS@ @KERNEL_NO_FORMAT_ZERO_LENGTH@
ifneq ($(KBUILD_EXTMOD),)
zfs_include = @abs_top_srcdir@/include