Since "dmd.conf" has specific flags depending on word size generated by dmd, is there any way to know this state i.e. like an environment variable?

"pkg-config" command is an easy way to give the compiler the right flags for an specific library. Now these flags are for both, 32 and 64 bit. If "pkg-config" was able to know this information, then will first search on the right library path by setting PKG_CONFIG_PATH environment variable, avoiding the use of "--no-warn-search-mismatch" flag and becoming in a faster linking.

Another solution should be include the "pkg-config" functionality into the compiler itself.

Regards,
-- 
Jordi Sayol