[Libguestfs] [PATCH] build: Reduce -Wformat-overflow=2 to =1.

GCC 9 gives this error which I believe is bogus: qemuopts.c: In function 'qemuopts_to_config_channel': qemuopts.c:987:29: error: '%.*s' directive output between 0 and 2147483647 bytes may exceed minimum required size of 4095 [-Werror=format-overflow=] 987 | fprintf (fp, " %.*s = ", (int) k, values[j]); | ^~~~ qemuopts.c:987:26: note: assuming directive output of 1 byte 987 | fprintf (fp, " %.*s = ", (int) k, values[j]); | ^~~~~~~~~~~ --- m4/guestfs-c.m4 | 3 +++ 1 file changed, 3 insertions(+) diff --git a/m4/guestfs-c.m4 b/m4/guestfs-c.m4 index 3fd44ed6b..e20721f5f 100644 --- a/m4/guestfs-c.m4 +++ b/m4/guestfs-c.m4 @@ -105,6 +105,9 @@ gl_WARN_ADD([-Wimplicit-fallthrough=4]) dnl GCC level 2 gives incorrect warnings, so use level 1. gl_WARN_ADD([-Wformat-truncation=1]) +dnl GCC 9 at level 2 gives apparently bogus errors when %.*s is used. +gl_WARN_ADD([-Wformat-overflow=1]) + AC_SUBST([WARN_CFLAGS]) NO_SNV_CFLAGS= -- 2.20.1