GNU Tools Weekly News Week 60 (October 18, 2026)

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GNU Tools Weekly News Week 60 (October 18, 2026)

Release updates for GNU toolchain:
 * None

General/big GNU toolchain news (including sourceware news):
 * Sourceware infrastructure updates for Q3 2026
  * https://inbox.sourceware.org/gcc/20261016233400.GX4060@gnu.wildebeest.org/
 * Office Hours for the GNU Toolchain happened last Thursday
  * notes can be found at https://gcc.gnu.org/wiki/OfficeHours


GCC easy issue to tackle of the week:
 *  `~a < -a` can be optimized to `a != 0` for unsigned types
  * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112628
  *  Reach out to Andrea Pinski <andrew.pinski@oss.qualcomm.com> for
mentoring on this issue.
 * Previous ones are listed on https://gcc.gnu.org/wiki/EasyIssuesOfTheWeek

GCC commits:
 * https://gcc.gnu.org/r17-5075 ...  r17-5314 - 240 commits
 * gccrs update
  * https://gcc.gnu.org/r17-5131 ... r17-5170
  * support for rustc_legacy_const_generics
  * support for recursive types
  * support type bound predicates
  * initial support for derive_coerce_pointee
  * Drop -frust-c-style-string-literals, add -frust-compat-version
  * fix lifetime handling in trait items
  * more cleanup after nr1 retirement
  * internal refactoring around the differents mappings the compiler maintains
  * test core until typecheck
  * infra work to make libraries upgrade easier
 * range-ops: Allow for non singleton for deriving from comparisons
  * https://gcc.gnu.org/r17-5097-g08cc07aedf61cf
 * RISC-V: Add more czero patterns/splitters
  * https://gcc.gnu.org/r17-5103-gcebcce44cccc68
 * aarch64: Treat all SVE as basic NEON instructions in DFA
  * https://gcc.gnu.org/r17-5105-gfd7c5910162acd
 * Use rtx_insn (and others) [static typing] more
  * https://gcc.gnu.org/r17-5232 ... https://gcc.gnu.org/r17-5242
 * match: Use wide_int for shift-and-mask folding
  * https://gcc.gnu.org/r17-5256-g3383c738122861
  * Easy issue for week 32
 * match: Simplify (a & -a) < 0 to a == INT_MIN
  * https://gcc.gnu.org/r17-5264-gff133b4cd2202f
  * Easy issue for week 56
 * c-family: Add __UNSAFE_MATH_OPTIMIZATIONS__ predefined macro
  * r17-5263-g459d3cb9b8b965
 * RISC-V: Support vector initialization from two halves
  * https://gcc.gnu.org/r17-5255-g5dbc6f027e972f
 * configure cleanups
  * https://gcc.gnu.org/r17-5267 https://gcc.gnu.org/r17-5270
  * https://gcc.gnu.org/r17-5283 ... https://gcc.gnu.org/r17-5297
  * https://gcc.gnu.org/r17-5228 https://gcc.gnu.org/r17-5227
 * ccmp: Reject chains without an explicit comparison
  * https://gcc.gnu.org/r17-5213-gafe5ed138a7bbf
 * Remove experimental AOP rtx code
  * https://gcc.gnu.org/r17-5313-g46d2ce70e45865

GCC discussion:
 * RFC: -ffp-contract=local: contraction decided before IPA
  * https://inbox.sourceware.org/gcc/CAKa7H4qDEb5R1-fYPNmKf5uawZMZja7j6Wp-M_N6MUeh-o+GbA@mail.gmail.com/T/

GCC bugzilla stats
 *  149 new issues filed
 *  62 issues closed

binutils/gdb commits:
 * bpf: add the load-acquire and store-release instructions
  * https://sourceware.org/cgit/binutils-gdb/commit/?id=28c0e4fd63d326947addc801322b160da5451f08
 *
gdb discussion:
 * [RFC] PR symtab/34741: expression lookup and overridden weak functions
  * https://inbox.sourceware.org/gdb/CAKL4jwWT+2suZyXxPL0r7m+D3B5OvEoqB4CVY+3x+v4fvHGTHg@mail.gmail.com/T/#u
binutils discussion:
 *
glibc commits:
 * posix: expose pipe2 under _POSIX_C_SOUCE >= 202405
  * https://sourceware.org/cgit/glibc/commit/?id=2e27b7e9f57c74cc17e6854fdfa5afb708d9b4c8
glibc discussion:
 *