Now that the default FPU is 'auto' we can finally rewrite (and
simplify) the rules for mapping compiler options to multilibs. We
no-longer need to know the specific CPU, since the driver will
construct a suitable -march flag for us; this greatly simplifies the
overall logic. This patch rewrites the library list for A-profile
cores. We use various Make extention rules to simplify the logic even
further.
A couple of minor tweaks to the configure script and to the main
driver ensures that we always know the setting of -mfloat-abi and
-marm/-mthumb. Again, this helps simplify the logic further. The
change to arm_target_thumb_only relies on the fact that this routine
is only called if neither -marm nor -mthumb has been previously
selected or specified by the user.
A new testsuite module is added to check the libraries generated. The
new tests are only run if the compiler is configured with the relevant
multilibs enabled.
gcc:
* config.gcc: (arm*-*-*): When building a-profile libraries, force
the driver to pass through the default setting of -mfloat-abi.
* common/config/arm/arm-common.c (arm_target_thumb_only): Return -marm
rather than NULL.
* config/arm/t-multilib (MULTILIB_REUSE): Initialize to empty.
(all_feat_combs): New rule.
(MULTILIB_OPTIONS): Use explicit ARM and Thumb directories. Rework
default libraries.
* config/arm/t-aprofile: Rewrite.
gcc/testsuite:
* gcc.target/arm/multilibs.exp: New file.
From-SVN: r249296
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