From 23c1c0bdb270181c9e176cc67d64d0d03cced356 Mon Sep 17 00:00:00 2001
From: Ahmad Fatoum <ahmad@a3f.at>
Date: Sat, 4 May 2019 23:10:17 +0200
Subject: [PATCH] CMake: make unsequenced modifications an error

They not only result in discrepancies between different compiler,
but trigger undefined behavior. Avoid them by having them break
the CMake build and CI.
---
 CMakeLists.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index be74c4da..9bfb44bb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,6 +19,7 @@ endif()
 include(AddIfFlagCompiles)
 add_if_flag_compiles(-Werror=pointer-arith CMAKE_C_FLAGS)
 add_if_flag_compiles(-Werror=implicit-function-declaration CMAKE_C_FLAGS)
+add_if_flag_compiles(-Werror=unsequenced CMAKE_C_FLAGS)
 # src/external/jar_xm.h does shady stuff
 add_if_flag_compiles(-fno-strict-aliasing CMAKE_C_FLAGS)