ICL creates huge libraries, especially with all the flags I use (-O3 -no-prec-div -Qparallel -arch:SSE3 -QaxCORE-AVX2,CORE-AVX-I,AVX,SSE4.2,SSE4.1,SSSE3). XUL generated like this is about 150MB (and for comparison offical Firefox XUL DLL is about 37MB)!