[Bug driver/83206] -mfpu=auto does not work on ARM (armv7l-unknown-linux-gnueabihf)

["rearnsha at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83206

--- Comment #17 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Author: rearnsha
Date: Fri Dec  8 11:19:20 2017
New Revision: 255504

URL: https://gcc.gnu.org/viewcvs?rev=255504&root=gcc&view=rev
Log:
[arm] PR target/83206: Make native driver select fp-capable armv6 cores

A quirk in the historical naming of some ARMv6 products means that the
main CPU name implies the presence or otherwise of the floating point unit.
This causes problems when using -mfpu=auto with -mcpu=native: the driver is
picking a CPU that does not support a floating-point unit, even though
one may well exist.

This patch addresses this by selecting the FP-capable names so that FP
instructions will be generated if the other options suggest this is
permitted.

Note that a more complete fix is really needed here to look up the
FP/simd capabilities and append the appropriate capability extensions.
This will be the subject of some follow-up patches.

        * config/arm/driver-arm.c (arm_cpu_table): Use fp-capable product names
        for armv6 ARM CPU IDs.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/arm/driver-arm.c