[llvm-dev] Inconsistency in -march option between llc and clang

[Suprateeka R Hegde via llvm-dev]

Hi

On AArch64 (ARM 64-Bit Platform), I see there is an inconsistency in the 
values accepted by -march option between clang and llc.

---
$ llc -march=aarch64 -mattr=help 2>&1 | grep error
$ #No Error

$ llc -march=armv8a -mattr=help 2>&1 | grep error
llc: error: invalid target 'armv8a'.

$ clang -march=armv8a -E - < /dev/null  2>&1 | grep error
$ #No Error

$ clang -march=aarch64 -E - < /dev/null  2>&1 | grep error
clang-4.0: error: the clang compiler does not support '-march=aarch64'
---

llc accepts aarch64 (rejects armv8a) while clang accepts armv8a (rejects 
aarch64).

Shall I file this as bug (and assign it to myself)? Or am I missing 
something obvious?

Thanks a lot
--
Supra