File linux-5.6-compat-clang.patch of Package zfs

--- a/config/kernel.m4	2020-05-01 14:10:09.402557947 +0200
+++ b/config/kernel.m4	2020-05-01 14:12:17.288047375 +0200
@@ -606,7 +606,7 @@
 AC_DEFUN([ZFS_LINUX_COMPILE], [
 	AC_TRY_COMMAND([
 	    KBUILD_MODPOST_NOFINAL="$5" KBUILD_MODPOST_WARN="$6"
-	    make modules -k -j$TEST_JOBS -C $LINUX_OBJ $ARCH_UM
+	    make CC=$CC modules -k -j$TEST_JOBS -C $LINUX_OBJ $ARCH_UM
 	    M=$PWD/$1 &>$1/build.log])
 	AS_IF([AC_TRY_COMMAND([$2])], [$3], [$4])
 ])
--- a/config/always-compiler-options.m4	2020-01-13 23:16:58.000000000 +0100
+++ b/config/always-compiler-options.m4	2020-05-01 14:25:37.700450195 +0200
@@ -22,7 +22,7 @@
 	AS_IF([ test "$enable_asan" = "yes" ], [
 		AC_MSG_CHECKING([whether $CC supports -fsanitize=address])
 		saved_cflags="$CFLAGS"
-		CFLAGS="$CFLAGS -fsanitize=address"
+		CFLAGS="$CFLAGS -Werror -fsanitize=address"
 		AC_LINK_IFELSE([
 			AC_LANG_SOURCE([[ int main() { return 0; } ]])
 		], [
@@ -52,7 +52,7 @@
 	AC_MSG_CHECKING([whether $CC supports -Wframe-larger-than=<size>])
 
 	saved_flags="$CFLAGS"
-	CFLAGS="$CFLAGS -Wframe-larger-than=4096"
+	CFLAGS="$CFLAGS -Werror -Wframe-larger-than=4096"
 
 	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
 		FRAME_LARGER_THAN="-Wframe-larger-than=4096"
@@ -73,7 +73,7 @@
 	AC_MSG_CHECKING([whether $CC supports -Wno-format-truncation])
 
 	saved_flags="$CFLAGS"
-	CFLAGS="$CFLAGS -Wno-format-truncation"
+	CFLAGS="$CFLAGS -Werror -Wno-format-truncation"
 
 	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
 		NO_FORMAT_TRUNCATION=-Wno-format-truncation
@@ -100,7 +100,7 @@
 	AC_MSG_CHECKING([whether $CC supports -Wno-bool-compare])
 
 	saved_flags="$CFLAGS"
-	CFLAGS="$CFLAGS -Wbool-compare"
+	CFLAGS="$CFLAGS -Werror -Wbool-compare"
 
 	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
 		NO_BOOL_COMPARE=-Wno-bool-compare
@@ -126,7 +126,7 @@
 	AC_MSG_CHECKING([whether $CC supports -Wno-unused-but-set-variable])
 
 	saved_flags="$CFLAGS"
-	CFLAGS="$CFLAGS -Wunused-but-set-variable"
+	CFLAGS="$CFLAGS -Werror -Wunused-but-set-variable"
 
 	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
 		NO_UNUSED_BUT_SET_VARIABLE=-Wno-unused-but-set-variable
@@ -147,7 +147,7 @@
 	AC_MSG_CHECKING([whether $CC supports -fno-omit-frame-pointer])
 
 	saved_flags="$CFLAGS"
-	CFLAGS="$CFLAGS -fno-omit-frame-pointer"
+	CFLAGS="$CFLAGS -Werror -fno-omit-frame-pointer"
 
 	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
 		NO_OMIT_FRAME_POINTER=-fno-omit-frame-pointer
--- a/module/zfs/dbuf.c	2020-01-22 23:01:28.892049223 +0100
+++ b/module/zfs/dbuf.c	2020-05-01 14:30:43.557540778 +0200
@@ -2397,11 +2397,11 @@
 	bcopy(mac, dr->dt.dl.dr_mac, ZIO_DATA_MAC_LEN);
 }
 
-#pragma weak dmu_buf_fill_done = dbuf_fill_done
 /* ARGSUSED */
 void
-dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx)
+dmu_buf_fill_done(dmu_buf_t *dbuf, dmu_tx_t *tx)
 {
+	dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf;
 	mutex_enter(&db->db_mtx);
 	DBUF_VERIFY(db);
 
--- a/config/kernel-inode-times.m4	2020-05-01 21:43:05.803789098 +0200
+++ b/config/kernel-inode-times.m4	2020-05-01 21:44:24.189714461 +0200
@@ -10,6 +10,7 @@
 		struct timespec64 ts;
 		struct inode ip;
 
+		memset(&ts, 0, sizeof(ts));
 		ts = timestamp_truncate(ts, &ip);
 	])