After gcc upgrade to 7.1, gcc7 contains a number of enhancements that help detect buffer overflow and other forms of invalid memory accesses.
When compiling lxc with gcc7, the system outputs errors: ../../../lxc-2.0.4/src/lxc/bdev/lxcloop.c:297:30: error: '%s' directive output may be truncated writing up to 255 bytes into a region of size 95 [-Werror=format-truncation=] This is because in configure.ac, the flag "-Werror" let the compiler treat the warnings as errors, in order to compile successfully, we should add the following to the configure.ac: -Wno-error=format-truncation Signed-off-by: Dengke Du <[email protected]> --- configure.ac | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/configure.ac b/configure.ac index b9646d1..c03dc2c 100644 --- a/configure.ac +++ b/configure.ac @@ -626,7 +626,7 @@ AC_PROG_SED LXC_CHECK_TLS if test "x$GCC" = "xyes"; then - CFLAGS="$CFLAGS -Wall -Werror" + CFLAGS="$CFLAGS -Wall -Werror -Wno-error=format-truncation" fi # Files requiring some variable expansion -- 2.11.0 _______________________________________________ lxc-devel mailing list [email protected] http://lists.linuxcontainers.org/listinfo/lxc-devel
