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NEWS: Add entry for glibc-hwcaps and deprecate legacy hwcaps
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NEWS
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NEWS
@ -16,6 +16,19 @@ Major new features:
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* The dynamic linker accepts the --argv0 argument and provides opportunity
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to change argv[0] string.
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* The dynamic linker loads optimized implementations of shared objects
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from subdirectories under the glibc-hwcaps directory on the library
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search path if the system's capabilities meet the requirements for
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that subdirectory. Initially supported subdirectories include
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"power9" and "power10" for the powerpc64le-linux-gnu architecture,
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"z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
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"x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
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subdirectory names correspond to the vendor-independent x86-64
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microarchitecture levels defined in the x86-64 psABI supplement.
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* The new --help option of the dynamic linker provides usage and
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information and library search path diagnostics.
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* The mallinfo2 function is added to report statistics as per mallinfo,
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but with larger field widths to accurately report values that are
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larger than fit in an integer.
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@ -63,6 +76,14 @@ Deprecated and removed features, and other changes affecting compatibility:
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libraries that use this type in their interfaces. The new definition
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improves consistency with compiler behavior in many scenarios.
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* A future version of glibc will stop loading shared objects from the
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"tls" subdirectories on the library search path, the subdirectory that
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corresponds to the AT_PLATFORM system name, and also stop employing
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the legacy AT_HWCAP search mechanism. Applications should switch to
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the new glibc-hwcaps mechanism instead; if they do not do that, only
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the baseline version (directly from the search path directory) will be
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loaded.
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Changes to build and runtime requirements:
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* On Linux, the system administrator needs to configure /dev/pts with
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