question about -print-search-dirs

[Kate Minola]

On 9/12/06, Daniel Jacobowitz <drow@false.org> wrote:

> Looking at the original example, Kate, what exactly were you confused
> about?  If it was the "/../lib64" suffix, those are added _after_ the
> list of directories to search are decided.  They're added when we
> consider whether the user asked for -m32 or -m64 (see multilib in the
> documentation).

Much thanks for the explanation.  This is precisely what was confusing
me.

Is there a gcc debug option (or another way) to determine if gcc is
defaulting to -m32 or -m64 mode?  Or what I really want, the _actual_
search libraries - with "/../lib64" if in -m64 mode?

The reason I ask is that libtool (or more precisely the m4 macro
AC_LIBTOOL_SYS_DYNAMIC_LINKER in libtool.m4) uses
"gcc -print-search-dirs" to set  sys_lib_search_path_spec.  But
if gcc is in -m64 mode but -print-search-dirs is only listing -m32
libraries, then bad things happen later on.

Kate Minola
University of Maryland, College Park