From 6fa93623516dc57f930c5208ed5f1a83434810b8 Mon Sep 17 00:00:00 2001
From: Arda Aytekin <aytekin@protonmail.com>
Date: Wed, 21 Mar 2018 18:21:39 +0100
Subject: [PATCH] Fix gcc build problem

Fixed gcc-related build problem resulting from `-errwarn=%all` switch.

Fixes #3012.
---
 CMakeLists.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0c905bca..bfee02a7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -298,7 +298,9 @@ endif ()
 
 if (LIBZMQ_WERROR)
   zmq_check_cxx_flag_prepend ("-Werror")
-  zmq_check_cxx_flag_prepend ("-errwarn=%all")
+  if (NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
+    zmq_check_cxx_flag_prepend ("-errwarn=%all")
+  endif()
 endif ()
 
 if (CMAKE_SYSTEM_PROCESSOR MATCHES "^sparc")