Re: Thinking toward mingw64 and mingw-get

On 2/27/2013 5:51 AM, Earnie Boyd wrote:
> So were does 64bit gcc look for 32bit headers and libraries when using -m32?

GCC's rules for this are, unfortunately, complicated. All but one of the 
header paths are architecture-agnostic; the single exception has "/32" 
appended in the case of "-m32". For library search, a copy of every 
library path is made with "32" or "/32" appended, and these copies are 
prepended to the search list. Rather than try to explain it in further 
detail, I'll just paste some prettified output.

Header paths (from g++ -m32 -v):
<sysroot>/lib/gcc/<arch>/<version>/include/c++
<sysroot>/lib/gcc/<arch>/<version>/include/c++/<arch>/32
<sysroot>/lib/gcc/<arch>/<version>/include/c++/backward
<sysroot>/lib/gcc/<arch>/<version>/include
<sysroot>/include
<sysroot>/lib/gcc/<arch>/<version>/include-fixed
<sysroot>/<arch>/include
/mingw/include

Library paths (from g++ -m32 -print-search-dirs):
<sysroot>/lib/gcc/<arch>/<version>/32
<sysroot>/lib/gcc/32
<sysroot>/<arch>/lib/<arch>/<version>/32
<sysroot>/<arch>/lib32
/mingw/lib/<arch>/<version>/32
/mingw/lib32
<sysroot>/lib/gcc/<arch>/<version>
<sysroot>/lib/gcc
<sysroot>/<arch>/lib/<arch>/<version>
<sysroot>/<arch>/lib
/mingw/lib/<arch>/<version>
/mingw/lib

-John E. / TDM

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