Ubuntu
glibc package

  1. Bug #2007599
  2. Comment #18

Comment 18 for bug 2007599

Revision history for this message
bugproxy (bugproxy) wrote : Comment bridged from LTC Bugzilla

------- Comment From <email address hidden> 2023-08-09 05:33 EDT-------
Hi Frank,

Sorry, I have not recognized that I should also check 2.35-0ubuntu3.3 package after my verification of 2.35-0ubuntu3.2 (see some comments above).
Nevertheless, I've installed the update and checked again:

$ /lib/ld64.so.1 --version
ld.so (Ubuntu GLIBC 2.35-0ubuntu3.3) stable release version 2.35.
...

$ /lib/ld64.so.1 --list-tunables | grep hwcaps
glibc.cpu.hwcaps:
=> Now this GLIBC_TUNABLES is also available on s390x.
When setting the tunables, you also see the value:
$ GLIBC_TUNABLES="glibc.cpu.hwcaps=z13" /lib/ld64.so.1 --list-tunables | grep hwcaps
glibc.cpu.hwcaps: z13

Furthermore I've run a small test program which calls the IFUNC'ed functions memmove, memmem, strstr and UTF8_UTF16_Z9.so via iconv-conversion from UTF16BE to UTF8.
Running gdb with setting the GLIBC_TUNABLES in different flavors like this ...
gdb$ set environment GLIBC_TUNABLES glibc.cpu.hwcaps=z13
... leads to breaking in the different ifunc-variants of the mentioned functions.

Thanks again for integration.