From e430629a1e9e4300bee7584c6b53c5f0412d5bb6 Mon Sep 17 00:00:00 2001
From: Jaroslaw Stelter <Jaroslaw.Stelter@intel.com>
Date: Tue, 22 Nov 2022 10:14:12 +0100
Subject: [PATCH] xt-clang: Do not use -std=gnu99 for C++

Option -std=gnu99 applied to C++ files trigerrs warning for xcc
compiler however throws error for xt-clang.
This patch limits usage of this flag to C, ASM code only.

Signed-off-by: Jaroslaw Stelter <Jaroslaw.Stelter@intel.com>
---
 zephyr/CMakeLists.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/zephyr/CMakeLists.txt b/zephyr/CMakeLists.txt
index 6c3dec88b..3b77faba3 100644
--- a/zephyr/CMakeLists.txt
+++ b/zephyr/CMakeLists.txt
@@ -895,7 +895,8 @@ find_package(Python3 COMPONENTS Interpreter)
 set(PYTHON3 "${Python3_EXECUTABLE}")
 
 # SOF uses GNU C99 extensions. TODO other flags required ?
-target_compile_options(SOF INTERFACE -std=gnu99 -fno-inline-functions)
+target_compile_options(SOF INTERFACE -fno-inline-functions)
+target_compile_options(SOF INTERFACE $<$<COMPILE_LANGUAGE:C,ASM>: -std=gnu99>)
 
 # Toolchain info
 add_definitions(-DXCC_TOOLS_VERSION="${ZEPHYR_TOOLCHAIN_VARIANT}" -DCC_OPTIMIZE_FLAGS="${OPTIMIZATION_FLAG}")