GNU Tools Weekly News Week 34 (April 19, 2026)

GNU Tools Weekly News Week 34 (April 19, 2026)
Release updates for GNU toolchain:
 * gcc 16.0 regression status (note this is not official numbers, it
might be off by a few)
  * great push from developers last week
  * P1:                       2         -8
  * P1+P2+P3 total: 754      -12
 * (non-GNU but still toolchain related) valgrind 3.27.0
  * RC1+RC2 was done last week
  * The final 3.27.0 release is scheduled for Mon Apr 20.

GNU toolchain conference news:
 * FOSSY 2026 toolchain track North America, Aug 6-9
  * https://inbox.sourceware.org/gcc/[email protected]/T/
  * Call for Proposals: https://2026.fossy.ca/call-for-proposals/
* GNU Tools Cauldron 2026 Call for Proposals is open (still soft launch)
  * Fri-Sun, October 2-4, 2026 at Charles University in Prague, Czechia
  * https://gcc.gnu.org/wiki/cauldron2026
  * https://conf.gnu-tools-cauldron.org/prg26/cfp

General/big GNU toolchain news (including sourceware news):
 * The GNU libc atanh is correctly rounded
  * https://inbox.sourceware.org/libc-alpha/p9u0bjfl36v1.fsf@thym/T/#u
  * https://inria.hal.science/hal-05591661
 * gccrs March 2026 Monthly report
  * https://rust-gcc.github.io/2026/04/13/2026-03-monthly-report.html
 * Office Hours for the GNU Toolchain were held last Friday
  * Meeting notes can be found at https://gcc.gnu.org/wiki/OfficeHours
 * forge.sourceware.org has been upgraded to forgejo v15.0.0
 * elfutils 0.195 released
  * https://inbox.sourceware.org/elfutils-devel/CAJDtP-Qok4ViNzvrr28WgkCCqrFH0iAZStiD8C7nbpDhrPzLWA@mail.gmail.com/
 * Peter0x44 posted a blog entry about C++ Ia64 ABI vtables
  * https://peter0x44.github.io/posts/vtables-itanium-abi/

GCC easy issue to tackle of the week:
 * some force_gimple_operand_gsi in tree-strlen.cc should be replaced
by gimple_build/gimple_convert
  * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122989
  * Note this is different from previous weeks; this is cleanup of GCC
sources rather than missed optimization
  * Reach out to Andrea Pinski <[email protected]> for
mentoring on this issue.

GCC commits:
 * note most of the commits from now until the release are bug fixes
which have not been listed here normally
 * GCC rust  sync of 43 patch set
 * aarch64: Add RTL pass to narrow 64-bit GP reg writes to 32-bit
  * https://gcc.gnu.org/cgit/gcc/commit/?id=f9f744360e6d7f5e86d39cd1f7df8b3dcf71863c
 * AArch64: Add -mcpu=armagicpu definition
  * https://gcc.gnu.org/cgit/gcc/commit/?id=0f5f728854d2ea93e6806a8632c04383502b0386
 * middle-end: disable CRC pass when -Os and the target does not have
CRC optabs [PR124900]
  * https://gcc.gnu.org/cgit/gcc/commit/?id=26e88fe809de0f1a1812c99e2e0106afb03257b3
 * nvptx: Support '-march=sm_50' and '-mptx=4.0'
  * https://gcc.gnu.org/cgit/gcc/commit/?id=7584007b797620c22da6da9783b04eda873e5e7f
  * https://gcc.gnu.org/cgit/gcc/commit/?id=1b5948d7141b2651a48f73709d11dd253e1fa689
 * libstdc++: Implement structured binding support for integer_sequence
  * https://gcc.gnu.org/cgit/gcc/commit/?id=6159bfcf8b5852417519cf4181bf0ff8907ac0ca
 * libstdc++: Runtime fallback for constant_wrapper subscript and call
operators.
  * https://gcc.gnu.org/cgit/gcc/commit/?id=9c0a9b700e5b8c1fbd09cfab7f8d268195aeebfe
 * c++: Implement CWG3149 - Rvalues in destructuring expansion statements
  * https://gcc.gnu.org/cgit/gcc/commit/?id=96f4731b0737638441df699bf18587ed9cc6c364
 * c++, libstdc++: Implement LWG4483 - Multidimensional arrays are not
supported by meta::reflect_constant_array and related functions
  * https://gcc.gnu.org/cgit/gcc/commit/?id=2cdd7831e31601c640bec01a1240cbcb6a72b5c4
 * c++: Implement CWG3149 - Rvalues in destructuring expansion statements
  * https://gcc.gnu.org/cgit/gcc/commit/?id=96f4731b0737638441df699bf18587ed9cc6c364

GCC discussion:
 * GSoC 2026 project discussions from participates
 * Policy on use of LLM tools and bug fixes
  * https://inbox.sourceware.org/gcc/CAH6eHdRc2zWF96TMVFg8SPN_g6E8L-VVAn0KOpw9TttZDo9t-g@mail.gmail.com/T/#m4365c662ccc0af15fe987fdd87556fb842e62d2a
  * Working Group on policy: https://gcc.gnu.org/wiki/working-group-ai-policy
 * [RFC] redesigning callbacks for make_forwarder_block
  * https://inbox.sourceware.org/gcc/CALvbMcCxyfm5njHgCt-pxTDbLt_ZubYWBtU03gRWBZgeCZgJwg@mail.gmail.com/T/#m96cbfb9f9e483fa1aca51cbc200767714b05a801
  * Outcome approved patch:
https://inbox.sourceware.org/gcc-patches/CAFiYyc2NF_kbPARS30w3zdjvqUFeDc2k8wDGtfQGb=m_aH-BYQ@mail.gmail.com/T/
 * RFC: Another pass_late_combine after pass_reorder_blocks?
  * https://inbox.sourceware.org/gcc/CAFULd4aDCK=rc8j7o87E7MZNOoDS9HX3=w2h0HvBfxEbki1D=A@mail.gmail.com/T/
 * Glob to match bare-metal SuperH target triple in config.gcc seems
wrong (sh*-superh-elf)?
  * https://inbox.sourceware.org/gcc/[email protected]/T/#m52db2fb40c67cdc49584a924bcf3381ed7fecaaa


GCC bugzilla stats
 * 72 new issues filed
 * 99 issues closed

glibc commits:
 * elf: Align large load segments to PMD huge page size for THP and tunable
  * https://sourceware.org/cgit/glibc/commit/?id=2f9fc3fba6562c888204159c09d654cb3499e38b
  * https://sourceware.org/cgit/glibc/commit/?id=f9933bf832d4ea4bb1b21db435e61324c05b7b10
  * https://sourceware.org/cgit/glibc/commit/?id=88c3f481de92808499464fa7e2ac1e9fce9d649c
  * Enable by default for 64bit loongarch
   * https://sourceware.org/cgit/glibc/commit/?id=ef044cc6d79c5646b521569417da890154ea1813

glibc discussion:
 * glibc AI policy (continued)
 *

binutils/gdb commits:
 * Add a "-O 0" option to the linker for a faster, but less effective link.
  * https://sourceware.org/cgit/binutils-gdb/commit/?id=4fe7dd9a10d15928834d8a20ec91f2b1436c8108
 *
gdb discussion:
 *
binutils discussion:
 *