From 751c3c104eeb89613f07b74002585d70c012af97 Mon Sep 17 00:00:00 2001
From: albert-github <albert.tests@gmail.com>
Date: Mon, 11 May 2020 12:53:45 +0200
Subject: GNU compilation warnings

Older GNU compilers, i.e. before version 7, don't know the option `-Wno-implicit-fallthrough`, so it is made compiler version dependent.
(would have liked to use `VERSION_GREATER_EQUAL` but this is introduced in cmake 3.7)
---
 cmake/CompilerWarnings.cmake | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/cmake/CompilerWarnings.cmake b/cmake/CompilerWarnings.cmake
index 41ee545..e6c1539 100644
--- a/cmake/CompilerWarnings.cmake
+++ b/cmake/CompilerWarnings.cmake
@@ -93,7 +93,6 @@ function(set_project_warnings project_name)
       -Wno-unused-parameter
       -Wno-sign-conversion
       -Wno-format-nonliteral
-      -Wno-implicit-fallthrough
 
       # enable to turn warnings into errors
       #-Werror
@@ -104,7 +103,15 @@ function(set_project_warnings project_name)
   elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
     set(PROJECT_WARNINGS ${CLANG_WARNINGS})
   else()
-    set(PROJECT_WARNINGS ${GCC_WARNINGS})
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER "7.0.0")
+      set(GCC_EXTRA_WARNINGS
+        -Wno-implicit-fallthrough
+      )
+    else()
+      set(GCC_EXTRA_WARNINGS
+      )
+    endif()
+    set(PROJECT_WARNINGS ${GCC_WARNINGS} ${GCC_EXTRA_WARNINGS})
   endif()
 
   target_compile_options(${project_name} PRIVATE ${PROJECT_WARNINGS})
-- 
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