[PATCH] aarch64: Do not link conform tests with -Wl,-z,force-bti (bug 33601)

[Florian Weimer]

* Yury Khrustalev:

> Hi Florian,
>
> On Thu, Nov 06, 2025 at 12:15:25PM +0100, Florian Weimer wrote:
>> If the toolchain does not default to generate BTI markers in GCC,
>> the main program for conform runtime tests will not have the
>> BTI marker that -Wl,-z,force-bti requires.  Without -Wl,-z,force-bti,
>> the link editor will not tell the dynamic linker to enable BTI,
>> and the missing BTI marker is harmless.
>> 
>> ---
>>  sysdeps/aarch64/Makefile | 6 +++++-
>>  1 file changed, 5 insertions(+), 1 deletion(-)
>> 
>> diff --git a/sysdeps/aarch64/Makefile b/sysdeps/aarch64/Makefile
>> index 9479fb9679..8a98e1d978 100644
>> --- a/sysdeps/aarch64/Makefile
>> +++ b/sysdeps/aarch64/Makefile
>> @@ -2,11 +2,15 @@ long-double-fcts = yes
>>  
>>  ifeq (yes,$(aarch64-bti))
>>  # Mark linker output BTI compatible, it warns on non-BTI inputs.
>> +# Do not do this for conform tests because they may not be compiled
>> +# with the appropriate compiler flags.
>> +ifneq ($(subdir),confirm)
>>  sysdep-LDFLAGS += -Wl,-z,force-bti
>>  # Make warnings fatal outside the test system.
>>  LDFLAGS-lib.so += -Wl,--fatal-warnings
>>  LDFLAGS-rtld += -Wl,-z,force-bti,--fatal-warnings
>> -endif
>> +endif # $(subdir) != conform
>> +endif # $(aarch64-bit)
>>  
>>  ifeq ($(subdir),elf)
>>  sysdep-dl-routines += \
>> 
>> base-commit: a61332f0869885b3f2fd3266ec0f28a2ed13ff75
>> 
>
> I'll need to look at this more carefully on Monday but does this patch
> try to change the place that is removed in [1]?
>
> [1]: https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=259adb087dd99a199b125e7b955f1d35044664b4

Yes, at this point we need it for 2.41 and earlier only
(wuth with the s/confirm/conform/ change applied).

Thanks,
Florian