From 05763b3669a19e5de5d6dc22609941fb9d811d72 Mon Sep 17 00:00:00 2001
From: Gregory Hainaut <gregory.hainaut@gmail.com>
Date: Thu, 11 May 2017 23:14:06 +0200
Subject: [PATCH] cmake: better gcc + gsdx integration

Only set fabi-version on older GCC (5.0 and below)
Disable broken optimization for GCC7+ (until we find a better solution)
---
 cmake/Pcsx2Utils.cmake      |  2 ++
 plugins/GSdx/CMakeLists.txt | 20 +++++++++++++++-----
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/cmake/Pcsx2Utils.cmake b/cmake/Pcsx2Utils.cmake
index 36a9794154..9b71029b2b 100644
--- a/cmake/Pcsx2Utils.cmake
+++ b/cmake/Pcsx2Utils.cmake
@@ -69,6 +69,8 @@ function(check_compiler_version version_warn version_err)
                 message(WARNING "PCSX2 will stop supporting GCC ${GCC_VERSION} in the near future. Please upgrade to at least GCC ${version_warn}.")
             endif()
         endif()
+
+        set(GCC_VERSION "${GCC_VERSION}" PARENT_SCOPE)
     endif()
 endfunction()
 
diff --git a/plugins/GSdx/CMakeLists.txt b/plugins/GSdx/CMakeLists.txt
index 0d6acbbf37..718a81573a 100644
--- a/plugins/GSdx/CMakeLists.txt
+++ b/plugins/GSdx/CMakeLists.txt
@@ -20,8 +20,23 @@ if(USE_ICC)
 	set(CommonFlags "${CommonFlags} -restrict")
 endif()
 
+if(CMAKE_COMPILER_IS_GNUCXX)
+	# Newer version default to a correct ABI
+	if (${GCC_VERSION} VERSION_LESS "5.1")
+		set(GSdxFinalFlags ${GSdxFinalFlags} -fabi-version=6)
+	endif()
+	# github issue 1937
+	if (${GCC_VERSION} VERSION_GREATER "7.0")
+		set(GSdxFinalFlags ${GSdxFinalFlags} -fno-gcse-lm -fno-tree-pre)
+	endif()
+endif()
+
 set(GSdxFinalFlags ${CommonFlags})
 
+if(CMAKE_COMPILER_IS_GNUCXX AND (${GCC_VERSION} VERSION_LESS "5.0"))
+    set(GSdxFinalFlags ${GSdxFinalFlags} -fabi-version=6)
+endif()
+
 if(XDG_STD)
     set(GSdxFinalFlags ${GSdxFinalFlags} -DXDG_STD)
 endif()
@@ -34,11 +49,6 @@ if(LIBLZMA_FOUND)
 	set(GSdxFinalFlags ${GSdxFinalFlags} -DLZMA_SUPPORTED)
 endif()
 
-#Clang doesn't support a few common flags that GCC does.
-if(NOT USE_CLANG)
-    set(GSdxFinalFlags ${GSdxFinalFlags} -fabi-version=6)
-endif()
-
 if(OPENCL_API)
     set(GSdxFinalFlags ${GSdxFinalFlags} -DENABLE_OPENCL)
 endif()