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