When using gcc8 compiles utils.c, it complains as below:
utils.c:852:45: warning: '%s' directive output may be truncated writing
up to 4095 bytes into a region of size 4084 [-Wformat-truncation=]
snprintf(path, sizeof(path), "/dev/mapper/%s", name);
^~ ~~~~
In file included from /usr/include/stdio.h:873,
from utils.c:20:
/usr/include/bits/stdio2.h:67:10: note: '__builtin___snprintf_chk'
output between 13 and 4108 bytes into a destination of size 4096
return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
__bos (__s), __fmt, __va_arg_pack ());
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This isn't a type of warning we care about, particularly when PATH_MAX
is much less than either.
Using the GCC option -Wno-format-truncation to disable this for default
build.
Signed-off-by: Su Yanjun <suyj.f...@cn.fujitsu.com>
---
Makefile.extrawarn | 1 +
configure.ac | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/Makefile.extrawarn b/Makefile.extrawarn
index 1f4bda94a167..ed76fb5b5554 100644
--- a/Makefile.extrawarn
+++ b/Makefile.extrawarn
@@ -47,6 +47,7 @@ warning-1 += -Wold-style-definition
warning-1 += $(call cc-option, -Wmissing-include-dirs)
warning-1 += $(call cc-option, -Wunused-but-set-variable)
warning-1 += $(call cc-disable-warning, missing-field-initializers)
+warning-1 += $(call cc-option, -Wformat-truncation)
warning-2 := -Waggregate-return
warning-2 += -Wcast-align
diff --git a/configure.ac b/configure.ac
index df02f20655d9..c626beca8b77 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,7 +12,7 @@ LIBBTRFS_MAJOR=0
LIBBTRFS_MINOR=1
LIBBTRFS_PATCHLEVEL=2
-CFLAGS=${CFLAGS:-"-g -O1 -Wall -D_FORTIFY_SOURCE=2"}
+CFLAGS=${CFLAGS:-"-g -O1 -Wall -D_FORTIFY_SOURCE=2 -Wno-format-truncation"}
AC_SUBST([CFLAGS])
AC_PREREQ([2.60])
--
2.19.1
