[millstone]

Right. I had always thought that LLVM bitcode was unsuitable as a portable representation because it inevitably encoded architecture-specific details.

Consider code like this:

    int lsize(void) { return sizeof(void *); }

how would this be compiled portably, so that it returns 4 or 8 as appropriate? What would the LLVM bitcode look like?

[jensnockert]

This is true for LLVM bitcode in general, but PNaCl specifies an abstract machine that defines pointers as 4 bytes long. It also specifies Little Endian &c.

See http://www.chromium.org/nativeclient/pnacl/bitcode-abi#TOC-D...