Fix another GCC warning

```
[ 10%] Building CXX object src/CMakeFiles/minetest.dir/client/render/interlaced.cpp.o
cc1plus: warning: -Wabi won't warn about anything [-Wabi]
cc1plus: note: -Wabi warns about differences from the most up-to-date ABI, which is also used by default
cc1plus: note: use e.g. -Wabi=11 to warn about changes from GCC 7
```

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 8218d586c85a27556279f4540d8fbc2d28301786..c73b155336567532c777577807d2f77ca75a1313 100644 (file)
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -6,7 +6,7 @@ INCLUDE(CheckIncludeFiles)
 INCLUDE(CheckLibraryExists)
 
 # Add custom SemiDebug build mode
-set(CMAKE_CXX_FLAGS_SEMIDEBUG "-O1 -g -Wall -Wabi" CACHE STRING
+set(CMAKE_CXX_FLAGS_SEMIDEBUG "-O1 -g -Wall -Wabi=11" CACHE STRING
        "Flags used by the C++ compiler during semidebug builds."
        FORCE
 )
@@ -724,8 +724,8 @@ else()
        else()
                set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3 -ffast-math -fomit-frame-pointer")
        endif(CMAKE_SYSTEM_NAME MATCHES "(Darwin|FreeBSD)")
-       set(CMAKE_CXX_FLAGS_SEMIDEBUG "-g -O1 -Wall -Wabi ${WARNING_FLAGS} ${OTHER_FLAGS}")
-       set(CMAKE_CXX_FLAGS_DEBUG "-g -O0 -Wall -Wabi ${WARNING_FLAGS} ${OTHER_FLAGS}")
+       set(CMAKE_CXX_FLAGS_SEMIDEBUG "-g -O1 -Wall -Wabi=11 ${WARNING_FLAGS} ${OTHER_FLAGS}")
+       set(CMAKE_CXX_FLAGS_DEBUG "-g -O0 -Wall -Wabi=11 ${WARNING_FLAGS} ${OTHER_FLAGS}")
 
        if(USE_GPROF)
                set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -pg")