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glibc

The GNU C library.

Other Activity This Week

x86: Optimize memset-vec-unaligned-erms.S
Noah Goldstein: No bug. Optimization are 1.

x86: Optimize memcmp-evex-movbe.S for frontend behavior and size
Noah Goldstein: No bug. The frontend optimizations are to: 1.

elf: Remove Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT)
Fangrui Song: Intel MPX failed to gain wide adoption and has been deprecated for a while.

Recent Activity

x86: Optimize memset-vec-unaligned-erms.S
Noah Goldstein: No bug. Optimization are 1.

x86: Optimize memcmp-evex-movbe.S for frontend behavior and size
Noah Goldstein: No bug. The frontend optimizations are to: 1.

elf: Remove Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT)
Fangrui Song: Intel MPX failed to gain wide adoption and has been deprecated for a while.

Initial support for GNU_PROPERTY_1_NEEDED
H.J. Lu

S390: Add PCI_MIO and SIE HWCAPs
Stefan Liebler: Both new HWCAPs were introduced in these kernel commits:- 7e8403ecaf884f307b627f3c371475913dd29292 "s390: add HWCAP_S390_PCI_MIO to ELF hwcaps"- 7e82523f2583e9813e4109df3656707162541297 "s390/hwcaps: make sie capability regular hwcap" Also note that the kernel commit 511ad531afd4090625def4d9aba1f5227bd44b8e "s390/hwcaps: shorten HWCAP defines" has shortened the prefix of the macros from "HWCAP_S390_" to "HWCAP_".

Fixed inaccuracy of j0f (BZ #28185)
Paul Zimmermann: The largest errors over the full binary32 range are after this patch (on x86_64):

nptl: Add CLOCK_MONOTONIC support for PI mutexes
Adhemerval Zanella: Linux added FUTEX_LOCK_PI2 to support clock selection (commit bf22a6976897977b0a3f1aeba6823c959fc4fdae).

Add exp10 macro to (bug 26108)
Joseph Myers: glibc has had exp10 functions since long before they were standardized; now they are standardized in TS 18661-4 and C2X, they are also specified there to have a corresponding type-generic macro.

powerpc: Fix unrecognized instruction errors with recent binutils
Paul A. Clarke: Recent versions of binutils (with commit b25f942e18d6ecd7ec3e2d2e9930eb4f996c258a) stopped preserving "sticky" options across a base `.machine` directive, nullifying the use of passing "-many" through GCC to the assembler.

build-many-glibcs.py: add powerpc64le glibc variant without multiarch
Paul E. Murphy: This configuration tests the float128 to ldouble128 redirect support on powerpc64le without the extra wrappers needed to support ifunc on this target.

glibc Release Tags

Open master branch for glibc 2.35 development
Carlos O'Donell

Open master branch for glibc 2.34 development
Adhemerval Zanella

Prepare for glibc 2.33 release
Adhemerval Zanella: Update version.h, features.h, and ChangeLog.old/ChangeLog.22.

Open master branch for glibc 2.33 development
Carlos O'Donell: Happy hacking!

Generate ChangeLog.old/ChangeLog.20 for 2.31
Siddhesh Poyarekar: We're ready to tag!

Open master for 2.32 development
Siddhesh Poyarekar: happy hacking!

[MIPS] Raise highest supported EI_ABIVERSION value [BZ #24916]
Mihailo Stojanovic: This bumps the highest valid EI_ABIVERSION value to ABSOLUTE ABI. New testcase loads the symbol from the GOT with the "lb" instruction so that the EI_ABIVERSION header field of the shared object is set to ABSOLUTE (it doesn't actually check the value of the symbol), and makes sure that the main executable is executed without "ABI version invalid" error. Tested for all three ABIs (o32, n32, n64) using both static linker which handles undefined weak symbols correctly [1] (and sets the EI_ABIVERSION of the test module) and the one that doesn't (EI_ABIVERSION left as 0). [1]

Open master for 2.31 development
Carlos O'Donell

Tag 2.30 release
Carlos O'Donell

Update install and NEWS for 2.30 release
Carlos O'Donell

Most Popular In The Past Month

Fix f64xdivf128, f64xmulf128 spurious underflows (bug 28358)
Joseph Myers: As described in bug 28358, the round-to-odd computations used in the libm functions that round their results to a narrower format can yield spurious underflow exceptions in the following circumstances: the narrowing only narrows the precision of the type and not the exponent range (i.e., it's narrowing _Float128 to _Float64x on x86_64, x86 or ia64), the architecture does after-rounding tininess detection (which applies to all those architectures), the result is inexact, tiny before rounding but not tiny after rounding (with the chosen rounding mode) for _Float64x (which is possible for narrowing mul, div and fma, not for narrowing add, sub or sqrt), so the underflow exception resulting from the toward-zero computation in _Float128 is spurious for _Float64x.

build-many-glibcs.py: add powerpc64le glibc variant without multiarch
Paul E. Murphy: This configuration tests the float128 to ldouble128 redirect support on powerpc64le without the extra wrappers needed to support ifunc on this target.

nptl: Add CLOCK_MONOTONIC support for PI mutexes
Adhemerval Zanella: Linux added FUTEX_LOCK_PI2 to support clock selection (commit bf22a6976897977b0a3f1aeba6823c959fc4fdae).

powerpc: Fix unrecognized instruction errors with recent binutils
Paul A. Clarke: Recent versions of binutils (with commit b25f942e18d6ecd7ec3e2d2e9930eb4f996c258a) stopped preserving "sticky" options across a base `.machine` directive, nullifying the use of passing "-many" through GCC to the assembler.

S390: Add PCI_MIO and SIE HWCAPs
Stefan Liebler: Both new HWCAPs were introduced in these kernel commits:- 7e8403ecaf884f307b627f3c371475913dd29292 "s390: add HWCAP_S390_PCI_MIO to ELF hwcaps"- 7e82523f2583e9813e4109df3656707162541297 "s390/hwcaps: make sie capability regular hwcap" Also note that the kernel commit 511ad531afd4090625def4d9aba1f5227bd44b8e "s390/hwcaps: shorten HWCAP defines" has shortened the prefix of the macros from "HWCAP_S390_" to "HWCAP_".

Initial support for GNU_PROPERTY_1_NEEDED
H.J. Lu

elf: Remove Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT)
Fangrui Song: Intel MPX failed to gain wide adoption and has been deprecated for a while.

x86: Optimize memset-vec-unaligned-erms.S
Noah Goldstein: No bug. Optimization are 1.

x86: Optimize memcmp-evex-movbe.S for frontend behavior and size
Noah Goldstein: No bug. The frontend optimizations are to: 1.

Fixed inaccuracy of j0f (BZ #28185)
Paul Zimmermann: The largest errors over the full binary32 range are after this patch (on x86_64):

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