Clang is pretty big -- as a comparison, my Z80 IDE which uses SDCC (Simple Device C Compiler, i.e. no C++) loads about 2 MB of WASM + 2 MB of data and executes

Clang is pretty big -- as a comparison, my Z80 IDE which uses SDCC (Simple Device C Compiler, i.e. no C++) loads about 2 MB of WASM + 2 MB of data and executes a compile/assemble/link cycle in about 0.5 sec for a small program: http://8bitworkshop.com/v2.1.0/?platform=mw8080bw&file=gfxtest.c http://8bitworkshop.com/v2.1.0/?platform=mw8080bw&file=gfxte... Most of the execution time is spent in SDCC's register allocator, which was recently rewritten to generate better code but unfortunately is a lot slower than the old allocator.