[patch] MULTILIB_DEFAULTS needs an update for ARM multilib builds

[Matthias Klose <doko at ubuntu dot com>]

I did see gcc-4.7 fail to build for an ARM soft-float/hard-float multilib
configuration. The reason is that gcc -print-multi-directory doesn't print
anything for the non-default, and gcc -print-multi-lib only prints `.' (and then
not building the runtime libs for the non-default).  The reason is that
set_multilib_dir in gcc.c only consults MULTILIB_DEFAULTS (only defined in
linux-elf.h), but not configure_default_options in configargs.h.  This proposed
patch updates MULTILIB_DEFAULTS depending on the configure options. An
alternative approach would be to update set_multilib_dir and print_multilib_info
to lookup configure_default_options in configargs.h as well.

Note that this didn't fail to build in gcc-4.6, but I can't see yet what change
did cause the build failure.

I didn't check if other targets need an update as well.

Ok for the trunk?

  Matthias

Attachment: arm-multilib-defaults.diff
Description: Text document