[arm] Use strings for -march, -mcpu and -mtune options

Programming / Compilers / GCC - rearnsha [138bc75d-0d04-0410-961f-82ee72b054a4] - 16 June 2017 17:01 EDT

In order to support more complex specifications for cpus and architectures we need to move away from using enumerations to represent the set of permitted options. This basic change just moves the option parsing infrastructure over to that, but changes nothing more beyond generating a hint when the specified option does not match a known target (previously the help option was able to print out all the permitted values, but we can no-longer do that.

- config/arm/arm.opt (x_arm_arch_string): New TargetSave option. (x_arm_cpu_string, x_arm_tune_string): Likewise. (march, mcpu, mtune): Convert to string-based options.
- config/arm/arm.c (arm_print_hint_for_core_or_arch): New function. (arm_parse_arch_cpu_name): New function. (arm_configure_build_target): Use arm_parse_arch_cpu_name to identify selected architecture or CPU. (arm_option_save): New function. (TARGET_OPTION_SAVE): Redefine. (arm_option_restore): Restore string options. (arm_option_print): Print string options.

a99ae29 [arm] Use strings for -march, -mcpu and -mtune options
gcc/ChangeLog | 14 ++++++++
gcc/config/arm/arm.c | 92 ++++++++++++++++++++++++++++++++++++++++++++------
gcc/config/arm/arm.opt | 15 ++++++--
3 files changed, 108 insertions(+), 13 deletions(-)

Upstream: gcc.gnu.org

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