Building application with LDC and -flto=thin fails in link stage

[Nordlöw]

On Monday, 26 March 2018 at 22:13:02 UTC, Johan Engelen wrote:
> On Monday, 26 March 2018 at 22:07:49 UTC, Nordlöw wrote:
>> When I try build my application using LDC and -flto=thin it 
>> fails in the final linking
>
> You must also pass `-flto=thin` during linking (a special 
> plugin is needed for LTO, and LDC will only pass the plugin to 
> the linker when `-flto=` is specified).
> I couldn't see `-flto=thin` in your link command, so I suspect 
> that will fix it.
>
> - Johan

I added `lflags` to my dub configuration as

buildType "release-nobounds-lto" {
          buildOptions "releaseMode" "optimize" "inline" 
"noBoundsCheck" # TODO -march=native -ffast-math
          dflags "-mcpu=native" "-O3" "-flto=thin" 
platform="posix-ldc"
          lflags "-flto=thin" platform="posix-ldc"
}

forwarded as `-L-flto=thin` but still errors as

Linking...
ldmd2 
-of.dub/build/application-release-nobounds-lto-linux.posix-x86_64-ldc_2078-F2904BE3C4DA237C077E5C2B0B23442E/knetquery .dub/build/application-release-nobounds-lto-linux.posix-x86_64-ldc_2078-F2904BE3C4DA237C077E5C2B0B23442E/knetquery.o ../../.dub/packages/gmp-d-master/gmp-d/.dub/build/library-release-nobounds-lto-linux.posix-x86_64-ldc_2078-B287F67CE5FF6145BC229790CFB09607/libgmp-d.a phobos-next/.dub/build/library-release-nobounds-lto-linux.posix-x86_64-ldc_2078-F0F2FDB01B8401C04D657BCC145D46A5/libknet_phobos-next.a -L--no-as-needed -L-flto=thin -L-lzstd -L-lgmp -L-lc -L-lreadline -L-lz -L-lbz2
/usr/bin/ld: error: 
.dub/build/application-release-nobounds-lto-linux.posix-x86_64-ldc_2078-F2904BE3C4DA237C077E5C2B0B23442E/knetquery.o:1:3: invalid character
/usr/bin/ld: error: 
.dub/build/application-release-nobounds-lto-linux.posix-x86_64-ldc_2078-F2904BE3C4DA237C077E5C2B0B23442E/knetquery.o:1:3: syntax error, unexpected $end
/usr/bin/ld: error: 
.dub/build/application-release-nobounds-lto-linux.posix-x86_64-ldc_2078-F2904BE3C4DA237C077E5C2B0B23442E/knetquery.o: not an object or archive
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.o:function _start: error: undefined reference to 'main'
collect2: error: ld returned 1 exit status
Error: /usr/bin/gcc failed with status: 1
FAIL 
.dub/build/application-release-nobounds-lto-linux.posix-x86_64-ldc_2078-F2904BE3C4DA237C077E5C2B0B23442E/ knetquery executable
ldmd2 failed with exit code 1.