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* [glibc] NEWS: Add entry for glibc-hwcaps and deprecate legacy hwcaps
@ 2021-01-29 16:43 Florian Weimer
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From: Florian Weimer @ 2021-01-29 16:43 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=570bb42376b0885e34454b22baa005090e0e1ea2
commit 570bb42376b0885e34454b22baa005090e0e1ea2
Author: Florian Weimer <fweimer@redhat.com>
Date: Fri Jan 29 17:26:18 2021 +0100
NEWS: Add entry for glibc-hwcaps and deprecate legacy hwcaps
Diff:
---
NEWS | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/NEWS b/NEWS
index d121f7df87..920fc779d0 100644
--- a/NEWS
+++ b/NEWS
@@ -16,6 +16,19 @@ Major new features:
* The dynamic linker accepts the --argv0 argument and provides opportunity
to change argv[0] string.
+* The dynamic linker loads optimized implementations of shared objects
+ from subdirectories under the glibc-hwcaps directory on the library
+ search path if the system's capabilities meet the requirements for
+ that subdirectory. Initially supported subdirectories include
+ "power9" and "power10" for the powerpc64le-linux-gnu architecture,
+ "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
+ "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
+ subdirectory names correspond to the vendor-independent x86-64
+ microarchitecture levels defined in the x86-64 psABI supplement.
+
+* The new --help option of the dynamic linker provides usage and
+ information and library search path diagnostics.
+
* The mallinfo2 function is added to report statistics as per mallinfo,
but with larger field widths to accurately report values that are
larger than fit in an integer.
@@ -63,6 +76,14 @@ Deprecated and removed features, and other changes affecting compatibility:
libraries that use this type in their interfaces. The new definition
improves consistency with compiler behavior in many scenarios.
+* A future version of glibc will stop loading shared objects from the
+ "tls" subdirectories on the library search path, the subdirectory that
+ corresponds to the AT_PLATFORM system name, and also stop employing
+ the legacy AT_HWCAP search mechanism. Applications should switch to
+ the new glibc-hwcaps mechanism instead; if they do not do that, only
+ the baseline version (directly from the search path directory) will be
+ loaded.
+
Changes to build and runtime requirements:
* On Linux, the system administrator needs to configure /dev/pts with
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