The build is broken when using gcc 6

[deadalnix via Digitalmars-d]

$ make -f posix.mak
make -C src -f posix.mak
make[1]: Entering directory '/home/deadalnix/d/dmd/src'
no cpu specified, assuming X86
   (CC)  BACK_OBJS  backend/cg87.c
c++ -c -Wno-deprecated -Wstrict-aliasing -fno-exceptions 
-fno-rtti -D__pascal= -DMARS=1 -DTARGET_LINUX=1 
-DDM_TARGET_CPU_X86=1 -m64 -Iroot -Itk -Ibackend -I. -DDMDV2=1 
-MMD -MF cg87.deps backend/cg87.c
backend/cg87.c: In function ‘unsigned char loadconst(elem*, int)’:
backend/cg87.c:716:46: error: narrowing conversion of ‘238’ from 
‘int’ to ‘char’ inside { } [-Wnarrowing]
          {0xEE,0xE8,0xEB,0xE9,0xEA,0xEC,0xED,0};
                                               ^
backend/cg87.c:716:46: error: narrowing conversion of ‘232’ from 
‘int’ to ‘char’ inside { } [-Wnarrowing]
backend/cg87.c:716:46: error: narrowing conversion of ‘235’ from 
‘int’ to ‘char’ inside { } [-Wnarrowing]
backend/cg87.c:716:46: error: narrowing conversion of ‘233’ from 
‘int’ to ‘char’ inside { } [-Wnarrowing]
backend/cg87.c:716:46: error: narrowing conversion of ‘234’ from 
‘int’ to ‘char’ inside { } [-Wnarrowing]
backend/cg87.c:716:46: error: narrowing conversion of ‘236’ from 
‘int’ to ‘char’ inside { } [-Wnarrowing]
backend/cg87.c:716:46: error: narrowing conversion of ‘237’ from 
‘int’ to ‘char’ inside { } [-Wnarrowing]
posix.mak:445: recipe for target 'cg87.o' failed
make[1]: *** [cg87.o] Error 1
make[1]: Leaving directory '/home/deadalnix/d/dmd/src'
posix.mak:8: recipe for target 'all' failed
make: *** [all] Error 2

$ c++ -v
Using built-in specs.
COLLECT_GCC=c++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/6/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 
6.2.0-6' --with-bugurl=file:///usr/share/doc/gcc-6/README.Bugs 
--enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ 
--prefix=/usr --program-suffix=-6 
--program-prefix=x86_64-linux-gnu- --enable-shared 
--enable-linker-build-id --libexecdir=/usr/lib 
--without-included-gettext --enable-threads=posix 
--libdir=/usr/lib --enable-nls --with-sysroot=/ 
--enable-clocale=gnu --enable-libstdcxx-debug 
--enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new 
--enable-gnu-unique-object --disable-vtable-verify 
--enable-libmpx --enable-plugin --with-system-zlib 
--disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo 
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-6-amd64/jre 
--enable-java-home 
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-6-amd64 
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-6-amd64 
--with-arch-directory=amd64 
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc 
--enable-multiarch --with-arch-32=i686 --with-abi=m64 
--with-multilib-list=m32,m64,mx32 --enable-multilib 
--with-tune=generic --enable-checking=release 
--build=x86_64-linux-gnu --host=x86_64-linux-gnu 
--target=x86_64-linux-gnu
Thread model: posix
gcc version 6.2.0 20161010 (Debian 6.2.0-6)

You'll ask me, why isn't this going in a bug report ? Well => 
https://forum.dlang.org/post/zttkvpmlvkujsjdrakkl@forum.dlang.org