[OpenWrt-Devel] [PATCH libubox 03/20] cmake: add more hardening compiler flags

[Petr Štetiar]

In order to spot possible issues with direct impact on security during
QA on CI (GCC version 6 and higher).

Ref: https://developers.redhat.com/blog/2018/03/21/compiler-and-linker-flags-gcc/
Signed-off-by: Petr Štetiar <ynezz at true.cz>
---
 CMakeLists.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index da7d03c7fc21..0b0c9e316bfb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,8 @@ PROJECT(ubox C)
 
 ADD_DEFINITIONS(-Wall -Werror)
 IF(CMAKE_C_COMPILER_VERSION VERSION_GREATER 6)
-	ADD_DEFINITIONS(-Wextra)
+	ADD_DEFINITIONS(-Wextra -Werror=implicit-function-declaration)
+	ADD_DEFINITIONS(-Wformat -Werror=format-security -Werror=format-nonliteral)
 ENDIF()
 ADD_DEFINITIONS(-Os -std=gnu99 -g3 -Wmissing-declarations -Wno-unused-parameter)
 

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