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NEWS: Add entry for glibc-hwcaps and deprecate legacy hwcaps

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This commit is contained in:
Florian Weimer 2021-01-29 17:26:18 +01:00
parent 04dff6fc0d
commit 570bb42376
1 changed files with 21 additions and 0 deletions
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NEWS
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@ -16,6 +16,19 @@ Major new features:
* The dynamic linker accepts the --argv0 argument and provides opportunity * The dynamic linker accepts the --argv0 argument and provides opportunity
to change argv[0] string. 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, * The mallinfo2 function is added to report statistics as per mallinfo,
but with larger field widths to accurately report values that are but with larger field widths to accurately report values that are
larger than fit in an integer. 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 libraries that use this type in their interfaces. The new definition
improves consistency with compiler behavior in many scenarios. 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: Changes to build and runtime requirements:
* On Linux, the system administrator needs to configure /dev/pts with * On Linux, the system administrator needs to configure /dev/pts with