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NEWS: editorial changes (language, line breaks) 

Signed-off-by: Andreas K. Hüttel <dilfridge@gentoo.org>
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Andreas K. Hüttel 2025-01-26 20:09:26 +01:00
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@ -9,22 +9,23 @@ Version 2.41
Major new features: Major new features:
* Support testing glibc build with a different set of C and C++ compilers * Support for testing a glibc build with a different set of C and C++
from the C and C++ compilers used to build glibc with compilers from the C and C++ compilers used to build glibc has been
added:
$ ../configure TEST_CC="gcc-6.4.1" TEST_CXX="g++-6.4.1" $ ../configure TEST_CC="gcc-6.4.1" TEST_CXX="g++-6.4.1"
And support testing glibc build with Clang This includes support for testing the glibc build with Clang, e.g.,
$ ../configure TEST_CC="clang" TEST_CXX="clang++" $ ../configure TEST_CC="clang" TEST_CXX="clang++"
Some run-time failures with Clang are expected. Some run-time failures with Clang are expected.
* In /etc/resolv.conf and the RES_OPTIONS, option flags can now be * In /etc/resolv.conf and the RES_OPTIONS environment variable, option
prefixed with “-” to clear previously set flags. For example, if flags can now be prefixed with “-” to clear previously set flags.
/etc/resolv.conf contains “options no-aaaa”, a process running with For example, if /etc/resolv.conf contains “options no-aaaa”, a
the RES_OPTIONS=-no-aaaa environment variable performs AAAA DNS process running with the RES_OPTIONS=-no-aaaa environment variable
queries when the glibc DNS stub resolver is used. performs AAAA DNS queries when the glibc DNS stub resolver is used.
* The DNS stub resolver now supports the strict-error option. If * The DNS stub resolver now supports the strict-error option. If
activated, getaddrinfo for the AF_UNSPEC address family (with dual activated, getaddrinfo for the AF_UNSPEC address family (with dual
@ -36,8 +37,9 @@ Major new features:
which is why this mode is not enabled by default. A future version which is why this mode is not enabled by default. A future version
of the library may turn it on by default, however. of the library may turn it on by default, however.
* On Linux, the sched_setattr and sched_getattr have been added, for * On Linux, the sched_setattr and sched_getattr functions have been
supporting parameterized scheduling policies such as SCHED_DEADLINE. added, for supporting parameterized scheduling policies such as
SCHED_DEADLINE.
* The iconv program now supports converting files in place. The program * The iconv program now supports converting files in place. The program
automatically uses a temporary file if required. automatically uses a temporary file if required.
@ -51,64 +53,70 @@ Major new features:
sinpi, tanpi. sinpi, tanpi.
* The GNU C Library now supports a feature test macro _ISOC2Y_SOURCE to * The GNU C Library now supports a feature test macro _ISOC2Y_SOURCE to
enable features from the draft ISO C2Y standard. Only some features from enable features from the draft ISO C2Y standard. Only some features
this draft standard are supported by the GNU C Library, and as the draft from this draft standard are supported by the GNU C Library, and as
is under active development, the set of features enabled by this macro is the draft is under active development, the set of features enabled by
liable to change. Features from C2Y are also enabled by _GNU_SOURCE, or this macro is liable to change. Features from C2Y are also enabled
by compiling with "gcc -std=gnu2y". by _GNU_SOURCE, or by compiling with "gcc -std=gnu2y".
* Optimized and correctly rounded exp10m1f, exp2m1f, expm1f, log10f, log2p1f, * Optimized and correctly rounded exp10m1f, exp2m1f, expm1f, log10f,
log1pf, log10p1f, cbrtf, erff, erfcf, lgammaf, tgammaf, tanf, acosf, acoshf, log2p1f, log1pf, log10p1f, cbrtf, erff, erfcf, lgammaf, tgammaf,
asinf, asinhf, atanf, atan2f, atanhf, coshf, sinhf, and tanhf from CORE-MATH tanf, acosf, acoshf, asinf, asinhf, atanf, atan2f, atanhf, coshf,
sinhf, and tanhf functions have been added from the CORE-MATH
project <https://core-math.gitlabpages.inria.fr/>. project <https://core-math.gitlabpages.inria.fr/>.
* A new tunable, glibc.rtld.execstack, can be used to control whether a * A new tunable, glibc.rtld.execstack, can be used to control whether an
executable stacks is allowed from the main program, either implicitly due executable stack is allowed from the main program, either implicitly
to a mising GNU_STACK ELF header or explicit explicitly because of the due to a mising GNU_STACK ELF header or explicit explicitly because
executable bit in GNU_STACK. The default is to allow executable stacks. of the executable bit in GNU_STACK. The default is to allow
executable stacks.
* Support for the extensible rseq ABI introduced in the Linux kernel version * Support for the extensible rseq ABI introduced in the Linux kernel
6.3 has been added. The size and alignment of the rseq area is now version 6.3 has been added. The size and alignment of the rseq area
determined by auxiliary vector entries when provided by the running kernel. is now determined by auxiliary vector entries when provided by the
This results in __rseq_size now exposing features past the original ABI running kernel. This results in __rseq_size now exposing features
which currently include 'node_id' and 'mm_cid' and will also allow exposing past the original ABI which currently include 'node_id' and 'mm_cid'
new features as they get added to future Linux kernels. and will also allow exposing new features as they get added to future
Linux kernels.
* The GNU C Library now supports Guarded Control Stack extension that allows * The GNU C Library now supports the Guarded Control Stack extension
to use shadow stacks on AArch64 systems that support this extension. that allows to use shadow stacks on AArch64 systems that support this
Building the library with standard branch protection enabled while using extension. Building the library with standard branch protection
a toolchain that supports GCS (binutils 2.44 and GCC 15 or later), will enabled while using a toolchain that supports GCS (binutils 2.44 and
enable GCS support in glibc. There is no special configuration flag. GCC 15 or later) will enable GCS support in glibc. There is no
GCS-enabled glibc is compatible with all existing executables and shared special configuration flag. GCS-enabled glibc is compatible with all
libraries and will run with and without GCS support in the system. GCS is existing executables and shared libraries and will run with and
opt-in and can be controlled at runtime via the glibc.cpu.aarch64_gcs without GCS support in the system. GCS is opt-in and can be
tunable, By default GCS is disabled. Linux kernel supports this since 6.13. controlled at runtime via the glibc.cpu.aarch64_gcs tunable. By
default GCS is disabled. Linux kernel supports this since 6.13.
Deprecated and removed features, and other changes affecting compatibility: Deprecated and removed features, and other changes affecting
compatibility:
* The big-endian ARC port (arceb-linux-gnu) has been removed. * The big-endian ARC port (arceb-linux-gnu) has been removed.
* The abort is now async-signal-safe and its implementation makes longjmp * abort is now async-signal-safe and its implementation makes longjmp
from the SIGABRT handler always abort if set up with setjmp. Use sigsetjmp from the SIGABRT handler always abort if set up with setjmp. Use
to keep the old behavior, where the handler does not stop the process sigsetjmp to keep the old behavior, where the handler does not stop
execution. the process execution.
* The nios2*-*-linux-gnu configurations are no longer supported. * The nios2*-*-linux-gnu configurations are no longer supported.
* dlopen and dlmopen no longer make the stack executable if a shared * dlopen and dlmopen no longer make the stack executable if a shared
library requires it, either implicitly because of a missing GNU_STACK ELF library requires it, either implicitly because of a missing GNU_STACK
header (and default ABI permission having the executable bit set) or ELF header (and default ABI permission having the executable bit set)
explicitly because of the executable bit in GNU_STACK, and the stack is or explicitly because of the executable bit in GNU_STACK, and the
not already executable. Instead, loading such objects will fail. stack is not already executable. Instead, loading such objects will
fail.
Changes to build and runtime requirements: Changes to build and runtime requirements:
* On recent Linux kernels with vDSO getrandom support, getrandom does not * On recent Linux kernels with vDSO getrandom support, getrandom does
act as a "shall occur" cancellation point, in which case it might not act as a "shall occur" cancellation point, in which case it might
not issue a syscall or trigger a deferred cancellation event. not issue a syscall or trigger a deferred cancellation event.
* Testing the GNU C Library requires GNU awk to be compiled with support for * Testing the GNU C Library requires GNU awk to be compiled with support
high precision arithmetic via the MPFR library. for high precision arithmetic via the MPFR library.
Security related changes: Security related changes: