[libstdc++] dg-require-atomic-builtins on ARM

[Sebastian Huber]

Hello,

I would like to run as many tests as possible on the arm-rtems target. 
Unfortunately about 100 tests use this:

// { dg-require-atomic-builtins "" }

Which uses a function check_v3_target_atomic_builtins in libstdc++.exp, 
which uses this program to determine if the atomic builtins are available:

     puts $f "#if __GCC_ATOMIC_BOOL_LOCK_FREE < 2"
     puts $f "#  error No atomic bool"
     puts $f "#endif"
     puts $f "#if __GCC_ATOMIC_INT_LOCK_FREE < 2"
     puts $f "#  error No atomic int"
     puts $f "#endif"

The default architecture version on arm-rtems is v4, so 
__GCC_ATOMIC_BOOL_LOCK_FREE == 1 and __GCC_ATOMIC_INT_LOCK_FREE == 1.

How do the other ARM testers tackle this issue? Would it be possible to 
add for example a "-march=armv7-a" option if the target selector 
contains "arm"?

-- 
Sebastian Huber, embedded brains GmbH

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