[PATCH 6/6] enforce use of G_GNUC_PRINTF attributes

[Daniel P. Berrangé <berrange@xxxxxxxxxx>]

We've been very gradually adding G_GNUC_PRINTF annotations
to functions over years. This has been useful in detecting
certain malformed printf strings, or cases where we pass
user data as the printf format which is a potential security
flaw.

Given the inherant memory corruption danger in use of format
strings vs mis-matched variadic arguments, it is worth applying
G_GNUC_PRINTF to all functions using printf, even if we know
they are safe.

The compilers can reasonably reliably identify such places
with the -Wsuggest-attribute=format / -Wmissing-format-attribute
flags.

Signed-off-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>
---
 configure | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/configure b/configure
index 26c7bc5154..b9abe19e16 100755
--- a/configure
+++ b/configure
@@ -1208,6 +1208,8 @@ add_to warn_flags -Wnested-externs
 add_to warn_flags -Wendif-labels
 add_to warn_flags -Wexpansion-to-defined
 add_to warn_flags -Wimplicit-fallthrough=2
+add_to warn_flags -Wsuggest-attribute=format
+add_to warn_flags -Wmissing-format-attribute
 
 nowarn_flags=
 add_to nowarn_flags -Wno-initializer-overrides
-- 
2.38.1