From fd475589a51fadab8919acd9d30d6e02ad07e824 Mon Sep 17 00:00:00 2001
From: Magne Sjaastad <magne.sjaastad@ceetronsolutions.com>
Date: Thu, 14 May 2020 09:27:27 +0200
Subject: [PATCH] Build : Adjust compiler flags for debug builds

buildcache requires compiler flag /Z7 to be set for MSVC. Adjust these flags to be able to use caching for debug builds.
---
 CMakeLists.txt | 43 ++++++++++++++++++++++++++++++-------------
 1 file changed, 30 insertions(+), 13 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3fb2c69ce7..921afef16e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,18 +1,5 @@
 cmake_minimum_required (VERSION 2.8.12)
 
-################################################################################
-# buildcache
-# 
-# buildcache will be used if found in path
-################################################################################
-find_program(buildcache_program buildcache)
-if(buildcache_program)
-    set(CMAKE_CXX_COMPILER_LAUNCHER "${buildcache_program}")
-    message( STATUS "Found buildcache from : ${buildcache_program}" )
-else()
-    message( STATUS "No buildcache found" )
-endif()
-
 include (CheckCSourceCompiles)
 project (ResInsight)
 
@@ -200,6 +187,36 @@ if(GIT_FOUND AND EXISTS "${PROJECT_SOURCE_DIR}/.git")
     endif()
 endif()
 
+
+################################################################################
+# buildcache
+# 
+# buildcache will be used if found in path
+# It is required to use compiler flag /Zi to be able to use buildcache
+# See https://docs.microsoft.com/en-us/cpp/build/reference/z7-zi-zi-debug-information-format?view=vs-2019
+# The adjustments of build flags must also be placed after libecl, as the adjustments
+# cause compiler issues for libecl
+################################################################################
+find_program(buildcache_program buildcache)
+if(buildcache_program)
+  set(CMAKE_CXX_COMPILER_LAUNCHER "${buildcache_program}")
+  message( STATUS "Found buildcache from : ${buildcache_program}" )
+
+  if (MSVC)
+    string(REGEX REPLACE "/Zi" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+
+    if(CMAKE_CXX_FLAGS_DEBUG MATCHES "/Zi")
+      message(STATUS "Clearing pdb setting")
+      string(REGEX REPLACE "/Zi" "" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
+    endif()
+
+    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /Z7")
+    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Z7")
+  endif()
+else()
+    message( STATUS "No buildcache found" )
+endif()
+
 ################################################################################
 # HDF5
 ################################################################################