Re: Build raise with -fasynchronous-unwind-tables

[Florian Weimer <fweimer at redhat dot com>]

* Siddhesh Poyarekar:

> On 24/01/20 6:03 am, Joseph Myers wrote:
>> In testing glibc for Arm and MIPS, I see:
>> 
>> FAIL: misc/tst-sigcontext-get_pc
>> 
>> If this test - backtracing through a call to raise - is valid, then
>> raise needs to be built with -fasynchronous-unwind-tables (as the test
>> itself is) to have the required unwind information for that
>> backtracing to work.  Adding that option, which this patch does,
>> causes the test for pass for Arm.  For MIPS, the test still does not
>> pass (the backtrace has an address that is 2 bytes after the "address
>> in signal handler", for unknown reasons), although the patch allows a
>> longer backtrace to be produced.
>> 
>
> The fix seems fine, but I wonder how the test passes on other
> architectures.

Many architectures default to -fasynchronous-unwind-tables in GCC.

The patch seems reasonable to me.

Thanks,
Florian