GCC - GNU Toolchain

GCC, Binutils, GDB, GLIBC. The system compiler for the FOSS and Linux software ecosystem. Continually Improving.

[GCC - GNU Toolchain @gnutools]

LLVM Weekly - #668, October 19th 2026. Static memory planner for MLIR, LLVM Memory Safety Workshop, fpconvert, LoopFusion cost model, Flang inline runtime check operations, LLVM libc on Hexagon, and more https://t.co/PixaPIIYou

[GCC - GNU Toolchain @gnutools]

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

Release updates for GNU toolchain:
 * None

General/big GNU toolchain news:
 * Office Hours for the GNU Toolchain happened last Thursday
  * notes can be found at https://t.co/TA1LeMDamm

GCC easy issue to tackle of the week:
 *  `~a < -a` can be optimized to `a != 0` for unsigned types
  * https://t.co/9kJ8H6xgS9
  *  Reach out to Andrea Pinski <[email protected]> for
mentoring on this issue.
 * Previous ones are listed on https://t.co/BMSaHXdg7r

GCC commits:
 * https://t.co/YoMrb5CSpH ...  r17-5314 - 240 commits
 * gccrs update
  * https://t.co/1LJGTJ4k2I ... 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://t.co/0tX92JbtLH
 * RISC-V: Add more czero patterns/splitters
  * https://t.co/La5j9v3kzY
 * aarch64: Treat all SVE as basic NEON instructions in DFA
  * https://t.co/7g4BoL7gmw
 * Use rtx_insn (and others) [static typing] more
  * https://t.co/VAyXjVZuVV ... https://t.co/69LjgObPsq
 * match: Use wide_int for shift-and-mask folding
  * https://t.co/UrdYqKV9n7
  * Easy issue for week 32
 * match: Simplify (a & -a) < 0 to a == INT_MIN
  * https://t.co/ZwauKMFVOo
  * 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://t.co/xo3TnV4qxs
 * configure cleanups
  * https://t.co/glJoisD4in https://t.co/sHRwbLNJum
  * https://t.co/lZFgohyeyp ... https://t.co/ImNTArGfeu
  * https://t.co/u7Sa5VbRRf https://t.co/KzyS9Vz4Ka
 * ccmp: Reject chains without an explicit comparison
  * https://t.co/ij6fAHxE7Q
 * Remove experimental AOP rtx code
  * https://t.co/ij48UTWkwT

GCC discussion:
 * RFC: -ffp-contract=local: contraction decided before IPA
  * https://t.co/YhK0sKd4O0

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

binutils/gdb commits:
 * bpf: add the load-acquire and store-release instructions
  * https://t.co/BIViSAscPQ
 *
gdb discussion:
 * [RFC] PR symtab/34741: expression lookup and overridden weak functions
  * https://t.co/JKrG4qPPPo
binutils discussion:
 *
glibc commits:
 * posix: expose pipe2 under _POSIX_C_SOUCE >= 202405
  * https://t.co/DM9ImgC0KD
glibc discussion:
 *

[GCC - GNU Toolchain @gnutools]

GNU Toolchain Office Hours Thursday, October 15 at 8:00 AM PT / 11:00 AM ET / 16:00 CET https://t.co/gaNwVuqbxI

[GCC - GNU Toolchain @gnutools]

LLVM Weekly - #667, October 12th 2026. Improving lit, last chance to register for LLVM Dev Meeting 2026, Women in Compilers and Tools meetup, ClangIR support built by default RFC accepted, LLDB debugserver in Swift, testing LLDB WebAssembly support, and more https://t.co/grBwUkgviD

[GCC - GNU Toolchain @gnutools]

@esrtweet The language of a new generation.

[GCC - GNU Toolchain @gnutools]

GNU Tools Weekly News Week 59 (October 11, 2026)

Release updates for GNU toolchain:
 * None

General/big GNU toolchain news:
 * The GNU tools cauldron was last weekend and it was huge success
  * Videos will be coming soon
 * Toon retired from the GCC steering committee
  * https://t.co/Tsamw80ETF
 * Re-enabling account signup on Bugzilla
  * https://t.co/aq1gUhQ1eT

GCC easy issue to tackle of the week:
 *  Missed optimization: fold `(a^b) <= 3` to `b < 4` for bool a
  * https://t.co/Qn1XNatjLr
  *  Reach out to Andrea Pinski <[email protected]> for
mentoring on this issue.
 * Previous ones are listed on https://t.co/BMSaHXdg7r

GCC commits (2 weeks):
 * https://t.co/S6zeGKP6xo ... r17-5074 -  369 commits
 * phiopt: Factor out ~/- with one constant
  * https://t.co/SzootWb0Wh
 * Merge common attribute handling code between libgccjit/Rust and c-family.
  * https://t.co/BQrA4aEZ96
  *https://t.co/i5kownaEDi r17-4974-gf9db2688e21d37
 * range-op: implement lhs_op[12]_relation for AND, OR, MIN, and MAX
  * https://t.co/qcY33rv24n
 * VRP: fold a LE or GE test between two names to an equality
  * https://t.co/LNQ0G3TtU9
 * i386: Ensure the x86 backend is any-or-plus (AOP) safe.
  * https://t.co/lL6VyaT4vx
 * aarch64: Port some NEON intrinsics to pragma-based framework
  * https://t.co/aLYFOoqnc9 https://t.co/xchKM6MGhB
  * https://t.co/D6Ydpzxr1l https://t.co/qTKK2qJvJL
  * https://t.co/x3KBxMQDZ5 https://t.co/S0amfhelln
 * some ftrapping-math fixes
  * https://t.co/TSMoPQ0Mzv https://t.co/nPhNAFvRfa
 * AArch64: Fix PCH PIE builds by using anchor
  * https://t.co/l3JQE9BSRN
 * missed FRE in loop
  * https://t.co/70Ka6DDdnP https://t.co/R1H3BoHpBk
  * https://t.co/NsYEprAJH9
 * c++/modules: P1811: relaxing redefinition restrictions
  * https://t.co/zxbaX8m3uZ
 * bpf: Some indirect call fixes
  * https://t.co/KV7JP4wpDa https://t.co/tyt9IhdT3G
https://t.co/fkk1bL7lCh
 * configure cleanups
  * https://t.co/VMYZfusd4H ... https://t.co/x93pag72P1
  * https://t.co/ktBkZlHs76 ... https://t.co/zB1YnABT9k
  * https://t.co/b2f9KA0Qfh

GCC discussion:
 * default C++ operator new's alignment
  * https://t.co/DQu5ZmrtF4
 *

GCC bugzilla stats (2 weeks)
  *  202 new issues filed
  *  119 issues closed

 binutils/gdb commits:
 * gdb: Add source-tracking breakpoints feature
  * https://t.co/PwB4yT852b
 * aarch64: mingw: Auto-import implementation (ld)
  * https://t.co/YHT3D4EkV9
 * BTF support: dumping and basic BFD support
  * https://t.co/GPOJJyBYPC
  * https://t.co/PUHef8WRx7
 * RISC-V: Introduce TLSDESC relaxation.
  * https://t.co/7LQgjHKjm7
 *

gdb discussion:
 *
binutils discussion:
 *
glibc commits:
 * math: Use cbrt from CORE-MATH
  * https://t.co/gP4vRdM2mt
 * AArch64: Add SVE2 strlen
  * https://t.co/dts9TIwzQG
 *
glibc discussion:
 * Requiring and enforcing known-key gpg commit signatures
  * https://t.co/uXq8R0drKR

[GCC - GNU Toolchain @gnutools]

@R1CH_TL @claudeai Thanka for finding this.
Have you reported the bug through the bug reporting process?
https://t.co/T912sslcpA

[GCC - GNU Toolchain @gnutools]

LLVM Weekly - #666, October 5th 2026. Sharing floating point routine implementations between libc and compiler-rt, EDG C++ frontend open sourced, September ClangIR progress report, forbidding AI generated communication, GitHub issues making merging difficult, and more. https://t.co/6r3hvYmTRO

[Phoronix @phoronix]

An @Intel Compiler Engineer Shares Latest Project Gains For APX

Plus @AMD update on ACE from the @gnutools GNU Tools Cauldron 2026.

https://t.co/xrvoH1Xx8P

[Rui Ueyama @rui314]

I just released mold 3.0.0! This is the first Rust version of mold, rewritten from C++ with performance on par with 2.42.1. The goal of mold 3.x is to close the remaining GNU ld compatibility gaps and make mold the default linker in Linux distros. https://t.co/cFs7Tn0m9Z

[GCC Rust @gcc_rust]

We'll also be at LPC on Monday with an update on gccrs and to discuss the compiler's progress which directly concerns the kernel and are looking forward to meet everyone there :)

[GCC Rust @gcc_rust]

Our talk at RustConf 2026 is now available: https://t.co/eGQXL0GdpE

as well as more details on our recent progress in our August monthly report: https://t.co/pdAG3BogJG

[GCC - GNU Toolchain @gnutools]

GNU Tools Cauldron 2026 starts tomorrow in Prague.
Come to the welcome reception at Andělský Pivovar starting at 19.00.

[GCC - GNU Toolchain @gnutools]

LLVM Weekly - #665, September 28th 2026. Remembering Johannes Doerfert.

Also: Wasm externref support, LLVM Foundation board minutes, bitinsert/bitextract, Flang -finit-local, and more. https://t.co/zv987Sk8wr

[GCC - GNU Toolchain @gnutools]

GNU Tools Weekly News Week 57 (September 27, 2026)

Release updates for GNU toolchain:
 * GDB 18.1.0 was released
  * https://t.co/6YCuWQMHT6

GNU toolchain conference reminders:
 *  GNU Tools Cauldron 2026
  * This Fri-Sun, October 2-4 (Prague, Czechia)
  * https://t.co/8PFrOm5VO7
  * https://t.co/37emyYEgLa
 * Toolchains Track at LPC 2026, October 7th (Prague, Czechia)
  * https://t.co/uLsWjwMOPh

General/big GNU toolchain news:
 *

GCC easy issue to tackle of the week:
 *  Missed optimization in math expression: optimize float / in some cases
  * https://t.co/FejAYGdQDO
  * Hint, this is like previous one: https://t.co/ZSmf8snFvZ;
though slightly more involved due to float rules
  *  Reach out to Andrea Pinski <[email protected]> for
mentoring on this issue.
 * Previous ones are listed on https://t.co/BMSaHXdg7r

GCC commits:
 * https://t.co/j9BkLeUnqt ... r17-4705 -  203 commits
 * match: Fold redundant integer-float-integer conversions
  * https://t.co/CRDvt3thVE
 * match: fold extract-bitfield-and-shift expressions
  * https://t.co/D8ShoaVXN6
 * aarch64: Improve isnan, isfinite, isinf and isnormal and fpclassify
  * https://t.co/Khepn1qmWT
  * https://t.co/bLqyQ40XTT
  * https://t.co/YTi9IkrA2j
 * match: fold abs(x) comparisons with x
  * https://t.co/9HCPmNsXnX
 * Improve libstdc++ rege
  * https://t.co/wc3H1ejwzL https://t.co/ICJYJxKmCq
  * https://t.co/FzTfeiT0Yr https://t.co/22EQx3LZka
 * AArch64: Turn off outline atomics with -mcmodel=large
  * https://t.co/PV31F9EAWj
 * simplify-rtx: [SU]MUL_HIGHPART RTL simplifications
  * https://t.co/s5PzgX523W
 * C++26 P3769R1: Clarification of placement new deallocation as a DR
  * https://t.co/8i9RaVfAgw
 * range-ops: derive operand equality from a zero MINUS_EXPR
  * https://t.co/OxF1LVHZml
 * match.pd: Fold (a != 0) | (popcount(a) == n) and related patterns
  * https://t.co/IxJPNPmzDK
 * vect: Look through promotions for SAT_TRUNC
  * https://t.co/04Oi6cJwbT
 * middle-end: fold VEC_UNPACK_LO/_HI over poly constants
  * https://t.co/xK873VwxPo

GCC discussion:
 *
GCC bugzilla stats
 *  123 new issues filed
 *  63 issues closed

binutils/gdb commits:
 * LoongArch: Enable shared library and PIE support for loongarch*-elf
  * https://t.co/ugM7U2e3ho
 * RISC-V: Enable shared library and PIE support for riscv*-elf
  * https://t.co/rTnOHj7yRS
 * RISC-V: Add optional register argument to tail pseudo
  * https://t.co/K1fpYjBDRE

gdb discussion:
 *
binutils discussion:
  *
glibc commits:
 * math: Sync lgamma, acosf, exp10m1f, and tgamma with CORE-MATH
  * https://t.co/tWNBnbpzwg
 * AArch64: Add SVE2 memchr
  * https://t.co/Luoakr0WlM
 *
glibc discussion:
 * segfault after reallocation (Was: malloc: Change mmap chunk layout)
  * https://t.co/QW3uhCKe8Z

[GCC - GNU Toolchain @gnutools]

GNU Tools Weekly News Week 56 (September 20, 2026)

Release updates for GNU toolchain:
 * GDB 18.1.0 update
  * https://t.co/ttNrY7DBCl
  * Release is this Friday!

GNU toolchain conference reminders:
 *  GNU Tools Cauldron 2026, Fri-Sun, October 2-4 (Prague, Czechia)
  * https://t.co/8PFrOm5VO7
  * https://t.co/37emyYEgLa
 * Toolchains Track at LPC 2026, October 7th (Prague, Czechia)
   * https://t.co/uLsWjwMOPh

General/big GNU toolchain news:
 * Syncing Rust GCC ["JIT"] backend or how to test Murphy's law
  * https://t.co/twRJyBjmNu
 * Meeting minutes - Office Hours for the GNU Toolchain - 2026-09-17
  * https://t.co/XrZAsvjDaK
  * https://t.co/TA1LeMDamm
 *

GCC easy issue to tackle of the week:
 *  `(a&-a) < 0` -> `a == INT_MIN`
  * https://t.co/6jSLOXNpl4
  *  Reach out to Andrea Pinski <[email protected]> for
mentoring on this issue.
 * Previous ones are listed on https://t.co/BMSaHXdg7r

GCC commits:
 * https://t.co/yWYqXytY02 ... r17-4502 -  291 commits
  * Improve saturated unsigned add detection
  * https://t.co/rGLDp0ZlOf https://t.co/Fla2sBDNB1
 * gccrs sync
  * https://t.co/woKPpCupCL ... https://t.co/tWVx1OW0gr
 * Improve some code in std::vector::push_back
  * https://t.co/37dpZhd58M
https://t.co/9x5tjd3dB3
 * contrib, libcpp, libstdc++: Update to Unicode 18.0.0
  * https://t.co/xjOVGMTtqp
 * aarch64: Add support for FEAT_CMH atomic {store,load} intrinsics
  * https://t.co/H1nujNTaV7
https://t.co/OF1AXAhYxV
 * phiopt: Better pre-vect heurstics for factoring out loads
  * https://t.co/5StkSwj3wp
 * cselim: cond_if_else_store_replacement_limited support skipping on
store one either side
 * https://t.co/McLDQfpqFg

GCC discussion:
 *

GCC bugzilla stats
 *  140 new issues filed
 *  55 issues closed

binutils/gdb commits:
 * RISC-V: Add Zama16b extension support
  * https://t.co/2Z7jDhQwYB
 * RISC-V: Add support for ziccamoc extension.
  * https://t.co/2KqkZpn3Ah

gdb discussion:
 *
binutils discussion:
 *
glibc commits:
 * aarch64: Add MTE mode tunable
  * https://t.co/nowmniKHEH
 * math: Update tanh from CORE-MATH
  * https://t.co/KymXSvVDCr
 * malloc: Improve calloc
  * https://t.co/yW63G9M5vE
 *
glibc discussion:
 * glibc buildbot status
  * https://t.co/8cQbVFYpMz

[Phoronix @phoronix]

The @gnutools GDB 18.1 Debugger Brings Better Windows Support

https://t.co/l04wdOoUYC

[Phoronix @phoronix]

This Week @AMD Posts @gnutools GCC Compiler Patches For AVX10V1AUX ISA Support

https://t.co/C86dzo7viO

[GCC - GNU Toolchain @gnutools]

LLVM Weekly - #664, September 21st 2026. Improving HLSL support in clangd, linker I/O tricks and their downsides, SuperH backend, BRay - tracing with BOLT, AMDGPU UndefinedBehaviorSanitizer, copy profiler, and more https://t.co/HWhGFStpfD