Release updates for GNU toolchain:
* GDB 18 release schedule proposal
* https://inbox.sourceware.org/gdb-patches/[email protected]/

GNU toolchain conference reminders:
* GNU Tools Cauldron 2026, Fri-Sun, October 2-4 (Prague, Czechia)
* https://gcc.gnu.org/wiki/cauldron2026
* https://conf.gnu-tools-cauldron.org/prg26/cfp
* Toolchains Track at LPC 2026, October 7th (Prague, Czechia)
* https://lpc.events/event/20/abstracts/

General/big GNU toolchain news (including sourceware news):
* Meeting Minutes - Office Hours for the GNU Toolchain - 2026-07-16
* https://inbox.sourceware.org/gcc/[email protected]/

GCC easy issue to tackle of the week:
* None this week, Andrea is on vacation.

GCC commits:
* https://gcc.gnu.org/r17-2346 ... r17-2531 186 commits
* cse: Eliminate redundant scalar duplication at different vector widths
* https://gcc.gnu.org/r17-2354-g10f6223d833874
* C++29: P3424R2: Deallocations with Throwing Exception Specification
Are Ill-formed
* https://gcc.gnu.org/r17-2482-g57ecb9897a0964
* match: Simplify sign tests for MIN and BIT_IOR
* https://gcc.gnu.org/r17-2487-gf8eb22d8408b25
* Easy issue of the week: Week 45
* lto: Support #pragma GCC diagnostic
* https://gcc.gnu.org/r17-2493-g4c85f7cf587f0f .. r17-2488-ga7db48e71b9483
* aarch64: deprecate the TME extension
* https://gcc.gnu.org/r17-2498-g17f084306c68c4
* riscv: Add min support for some extensions
* Svrsw60t59b, Ssqosid, Ssctr, Smctr, Smcdeleg, Ssccfg
* Ziccamoc, Ziccid
* https://gcc.gnu.org/r17-2521-ga3ee6072ca6d72 ... r17-2528-g741dd3fa641a45
* Improve BB vectorization of reductions
* https://gcc.gnu.org/r17-2478-g3adb3325954177

GCC discussion:
* [RFC] Proposal for tagged_by attribute to describe union discriminators
* https://inbox.sourceware.org/gcc/alf4-IVENZDyJ70X@thesun/

GCC bugzilla stats
* 91 new issues filed
* 58 issues closed

binutils/gdb commits:
* gdb: add annotation in 'info locals' command for variables shadowing case
* https://sourceware.org/cgit/binutils-gdb/commit/?id=2465b9e4131514bdb42365076ef65ef6ad0e3f6c

gdb discussion:
* [RFC] [gdb] Move ChangeLog files to archive dir
* https://inbox.sourceware.org/gdb-patches/[email protected]/
binutils discussion:
*

glibc commits:
* math: Update tanh from CORE-MATH (revision cf237fa0)
* https://sourceware.org/cgit/glibc/commit/?id=6b29e74c731e2ac1bc8048a389fdaf029bd96072
glibc discussion:
*

I need to write a function with void function() "fingerprint" whose body is a sequence of "advanced assembly code" like this:

asm volatile ( "store reg1, %0(sp)" :: "i"(__builtin_offsetof(mytype, reg1)));

I compile it with -O3 -fomit-frame-pointer and can see that in the emitted code there is neither a C prologue not epilogue for the stack management, just like I want.

My question revolves around the possibility that the optimizer could reorder those asm volatile instructions: this is something I would like not to happen.

Is this possible at all?
If so, is there a way to avoid it?

[UPDATE]: Possibly working workaround here.

Release updates for GNU toolchain:
 * dwz 0.17 was released July 11th
  * https://inbox.sourceware.org/gcc/[email protected]/T/#u
 * binutils 2.47 release branch was created
  * https://inbox.sourceware.org/binutils/CAMe9rOrBj1z8EA3FA9VfVMNkMbNCtoYfGfWiGSCjht=8bUHoTw@mail.gmail.com/T/#m541bfed9931e78a42f7a582f1e2c9585059a6fc2

GNU toolchain conference reminders:
 * GNU Tools Cauldron 2026, Fri-Sun, October 2-4 (Prague, Czechia)
  * https://gcc.gnu.org/wiki/cauldron2026
  * https://conf.gnu-tools-cauldron.org/prg26/cfp
 * Toolchains Track at LPC 2026, October 7th (Prague, Czechia)
  * https://lpc.events/event/20/abstracts/

General/big GNU toolchain news (including sourceware news):
 * Proposed updates to the gcc forge repositories
  * https://inbox.sourceware.org/gcc/[email protected]/
 * GCC MAINTAINERS file is now generated
  * https://inbox.sourceware.org/gcc/[email protected]/

GCC easy issue to tackle of the week:
 * None this week, Andrea is on vacation.

GCC commits:
 * https://gcc.gnu.org/r17-2148 -  r17-2345  198 commits
 * libbacktrace: support returning discriminator field
  * https://gcc.gnu.org/r17-2177-g49a5c52438b6a8
 * aarch64: Add support for -mcpu=rigel
  * https://gcc.gnu.org/r17-2197-g2f7613d36fecb6
 * gccrs merge
  * https://gcc.gnu.org/r17-2223 - r17-2260
 * s390: Remove -m31 support
  * https://gcc.gnu.org/r17-2272-g035f177a1eab31
 * fold-mem-offsets: Convert from DF to RTL-SSA
  * https://gcc.gnu.org/r17-2301-gf7a75a1506d91f
 * match: Improved comparison of integers to FP constants.
  * https://gcc.gnu.org/r17-2324-g081959973e38fd
 * expmed: Optimize 32-bit unsigned division by constants on 64-bit targets
  * https://gcc.gnu.org/r17-2334-gc585baad310a4a

GCC discussion:
 * Draft C2Y _BitInt related proposals
  * https://inbox.sourceware.org/gcc/ak0RdTxEebAf4T6K@tucnak/

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

binutils/gdb commits:
 * aarch64: Add support for FEAT_SME_FA64
  * https://sourceware.org/cgit/binutils-gdb/commit/?id=d708c86adccb169dd8bf5c7f4d73d7cab238d965
 *

gdb discussion:
 *
 binutils discussion:
 *

 glibc commits:
 * riscv: Add RVV stpncpy and strncpy for both multiarch and
non-multiarch builds
  * https://sourceware.org/cgit/glibc/commit/?id=df0669d41d753269312374e2eb6bd107bbec9c7b
  * https://sourceware.org/cgit/glibc/commit/?id=59cb960a22fbacb8b8baaa049529bf4638dfc625
 * Revert "malloc: aarch64: Add ifuncs for malloc functions"
  * https://sourceware.org/cgit/glibc/commit/?id=d70dd7d72273ac1aa53b435156de3f50f0c5a868

glibc discussion:

*

Release updates for GNU toolchain:
 * GCC 16.2.0 first week in August
  * https://inbox.sourceware.org/gcc/[email protected]/
 *  glibc-2.44 release: Soft freeze
  * Hard freeze July 4th
  * https://inbox.sourceware.org/libc-alpha/5439103.jY9Djz4Zq0@noumea/

GNU toolchain conference reminders:
 * GNU Tools Cauldron 2026, Fri-Sun, October 2-4 (Prague, Czechia)
  * https://gcc.gnu.org/wiki/cauldron2026
  * https://conf.gnu-tools-cauldron.org/prg26/cfp
 * Toolchains Track at LPC 2026, October 7th (Prague, Czechia)
  * https://lpc.events/event/20/abstracts/

General/big GNU toolchain news (including sourceware news):
 * GCC AI Policy Working Group submitted a proposed policy to the SC (July 3rd)
  * https://gcc.gnu.org/wiki/working-group-ai-policy
 * Rustc GCC backend report
  * https://blog.antoyo.xyz/rustc_codegen_gcc-progress-report-42
 * smtgcc mid-year update
  * https://inbox.sourceware.org/gcc/[email protected]/
 * Talk by Avinal Kumar on glibc's charset/conversion subsystems:
"Lost in translation"
  * https://avinal.space/talks/devconf-2026/#/1

GCC easy issue to tackle of the week:
 * `MIN<nonnegative,a> >= 0` is not simplified into `a >= 0`
  * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126087
  * Reach out to Andrea Pinski <[[email protected]](mailto:[email protected])> for
mentoring on this issue.
 * Previous ones are listed on https://gcc.gnu.org/wiki/EasyIssuesOfTheWeek

GCC commits:
 * https://gcc.gnu.org/r17-1944 .. r17-2147  204 commits
 * Ada update (Thanks again Marc):
  * https://gcc.gnu.org/r17-1956-gd54ca4e4da5db3 ... r17-1971-gb2029c82ff9174
  * Bug fixes.
  * Android support enhancement.
  * Flare OOP "Attribute Subprogram" first implementation.
  * Diagnostic messages improvements.
 * Match: Support unsigned scalar SAT_MUL form 14
  * https://gcc.gnu.org/r17-1946-g95540e74f33dad
 * aarch64: Fix tls debuginfo missing location info
  * https://gcc.gnu.org/r17-2093-g97d9016b230cca
 * libstdc++: implement LWG3662 basic_string::append/assign(NTBS, pos,
n) suboptimal
  * https://gcc.gnu.org/r17-2095-g7084db3f6e1cc6
 * SH: Switch to LRA permanently
  * https://gcc.gnu.org/r17-2104-g75a75f22f3a33e
 * cdcde: fold memset with length in [0, 1] to conditional store
  * https://gcc.gnu.org/r17-2113-ga8072f31bc9000
 * c++: Implement C++29 P2953R5 - Adding restrictions to defaulted
assignment operator functions
  * https://gcc.gnu.org/r17-2127-gc1a7d0a2140563
 * recognize CLZ via isolated MSB DeBruijn lookup
  * https://gcc.gnu.org/r17-2131-ga20f4528f3ab84
 * aarch64: Port NEON intrinsics to pragma-based framework
  * https://gcc.gnu.org/r17-2018-gefbc7fbb70d875 ... r17-2023-gde97b51852881d
 * c++: Implement C++29 P3540R3 - #embed offset parameter
  * https://gcc.gnu.org/r17-1995-g1ec0c5428cf84e
 * RISC-V: Add basic spacemit-x100 and Spacemit-A100 core support
  * https://gcc.gnu.org/r17-1983-g8596c662854b86
  * https://gcc.gnu.org/r17-2012-ge71bc0f8d7f93c

GCC discussion:
 * [RFC] Turning off trapping-math for C and C++ front-ends by default
  * https://inbox.sourceware.org/gcc/CALvbMcA6P_q7WNm1KOopzxhzRJHFi9T9_STaCtZrm1ZA-0nNtQ@mail.gmail.com/

GCC bugzilla stats
 *  97 new issues filed
 *  65 issues closed

binutils/gdb commits:
 * RISC-V: Add Zvdota extension classes
  * https://sourceware.org/cgit/binutils-gdb/commit/?id=89d59bf712045252b527bdfb69c07b0a29db7007
 * RISC-V: Add Zvbdota extension support
  * https://sourceware.org/cgit/binutils-gdb/commit/?id=794f538c3e57e3f55a6224a7206fdb0ea7815a82

gdb discussion:
 *
binutils discussion:
 *

glibc commits:
 * Add system-wide tunables
  * https://www.phoronix.com/news/Glibc-System-Tunables
  * https://sourceware.org/cgit/glibc/log/?id=e24269f74b8cd37ce33652e752f8012c3bfcdadc&qt=range&q=e24269f74b8cd37ce33652e752f8012c3bfcdadc...fae194043a099d45c044c883467c934153ecc51f
  * https://inbox.sourceware.org/libc-alpha/[email protected]/

glibc discussion:
 * x86-64 TCB layout dependency in Chrome, Firefox still not fixed
  * https://inbox.sourceware.org/libc-alpha/[email protected]/
 * The libc-locales mailing list is going to be closed, please use libc-alpha
  * https://inbox.sourceware.org/libc-alpha/[email protected]/

Release updates for GNU toolchain:
 * GCC 14.4.0 was released
  * https://inbox.sourceware.org/gcc/aj5L4BbnW8XMF7GQ@tucnak/

GNU toolchain conference reminders:
 * GNU Tools Cauldron 2026, Fri-Sun, October 2-4 (Prague, Czechia)
  * https://gcc.gnu.org/wiki/cauldron2026
  * https://conf.gnu-tools-cauldron.org/prg26/cfp
 * Toolchains Track at LPC 2026, October 7th (Prague, Czechia)
  * https://lpc.events/event/20/abstracts/

GCC easy issue to tackle of the week (2 this week):
 * ICE with return type of typedef of void and `#pragma omp declare simd`
  * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111856
  * Reach out to Andrea Pinski <[[email protected]](mailto:[email protected])> for
mentoring on this issue.
 * For RISC-V, prefer li+slli rather than lui+add for some constants
  * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126022
  * Reach out to Jeff Law <[[email protected]](mailto:[email protected])> for mentoring
on this issue.
 * Previous ones are listed on https://gcc.gnu.org/wiki/EasyIssuesOfTheWeek

GCC commits:
 * https://gcc.gnu.org/r17-1733 ...  r17-1943  211 commits
 * RTL: add dependent filter handling
  * https://gcc.gnu.org/r17-1779-g9d82914d073e2e ...
https://gcc.gnu.org/r17-1783-gc23f20c10d89af
  * https://inbox.sourceware.org/gcc-patches/[email protected]/
 * AArch64/SVE: Optimize vec_init for partial SVE vector modes
  * https://gcc.gnu.org/r17-1799-gb3acc5dd98f44d
 * rs6000: Add Future Vector Integer Arithmetic Instructions
  * https://gcc.gnu.org/r17-1800-ga3b8e252101ada
 * OMP improvements
  * De-duplicate libgomp entry points for OMPT
  * https://inbox.sourceware.org/gcc-patches/[email protected]/
  * https://gcc.gnu.org/r17-1803-g37c96bf08325bf ...
https://gcc.gnu.org/r17-1806-gd50e9f17fffa9b
 * rs6000: Builtins for ECC cryptography instructions
  * https://gcc.gnu.org/r17-1856-g2b3c882b5b8e96
 * RISC-V: GLIBC's setjmp preserves callee-saved registers
  * https://gcc.gnu.org/r17-1857-g21dad398994ff5
 * GCC rust sync
  * https://gcc.gnu.org/r17-1863-g5333e241a36912 ...
https://gcc.gnu.org/r17-1904-g30a64527c56af9
 * match: Use ranges for int-float comparisons
  * https://gcc.gnu.org/r17-1931-g8351875a5e2c52
 * Use tree_expr_nonnegative_p instead of TYPE_UNSIGNED for MAX (A, B)
(==,!=) 0 -> (A|B) (==,!=) 0
  * https://gcc.gnu.org/r17-1938-g61b702d88c8e55
 * Remove BOOL_BITFIELD define from system.h and update its uses
 * https://gcc.gnu.org/r17-1943-g08944b70002610

GCC discussion:
 * [RFC TREE-WIDE] gcc: stop using 'int' to represent sets of qualifiers
  * https://inbox.sourceware.org/gcc/[email protected]/
 * RFC: Allow "(mem:<vectype> (reg:<vectype>))"
  * https://inbox.sourceware.org/gcc/[email protected]/
 * [RFC] LRA: Carrying hard registers around
  * https://inbox.sourceware.org/gcc/[email protected]/
 * RFC: Bump minimum GNU Make version to 3.81
  * https://inbox.sourceware.org/gcc/CAH6eHdRuOhrEEYp6jmGZgq6QXUsMe4kr66LY62uk59MpYnTauw@mail.gmail.com/
 * [RFC] Add simple forwprop across edges (PHIs)
  * https://inbox.sourceware.org/gcc-patches/[email protected]/

GCC bugzilla stats
 *  101 new issues filed
 *  76 issues closed

binutils/gdb commits:
 * binutils: RISC-V: Add some extensions
  * Zalasr
  * SpacemiT vendor extension xsmtvdot
  * SpacemiT vendor extension xsmtvdotii
  * Svrsw60t59b
  * Zvabd
  * https://sourceware.org/cgit/binutils-gdb/log/?qt=range&q=d3b84dac949ac10f8736c85253b4a1073d244ac1...d26861e53c74d54be86149dd5b78d339487bebb4
  * Smpmpmt
   * https://sourceware.org/cgit/binutils-gdb/commit/?id=e56bd09181016800870de47c1f3a1091f71d9120
 * gdb: Handle nested Ada functions with gnat-llvm
  * https://sourceware.org/cgit/binutils-gdb/commit/?id=26d17a9b24dfd4a3894bc19ac752466ea10e80b2
 *

gdb discussion:
 * Adding architecture-specific commands in GDB
  * https://inbox.sourceware.org/gdb/[email protected]/

binutils discussion:
 *

glibc commits:
 * manual: Document indirect functions (IFUNC)
  * https://sourceware.org/cgit/glibc/commit/?id=657fe73fb1ce09c109fffafb16d565eedbbe05ed

glibc discussion:
 *

104 fixes!

Release updates for GNU toolchain:
 * GCC 14 branch is frozen for GCC 14.4.0 release
  * https://inbox.sourceware.org/gcc/[email protected]/
 * GCC 14.4.0 RC1 is done
  * https://inbox.sourceware.org/gcc/[email protected]/

GNU toolchain conference reminders:
 * GNU Tools Cauldron 2026, Fri-Sun, October 2-4 (Prague, Czechia)
  * https://gcc.gnu.org/wiki/cauldron2026
  * https://conf.gnu-tools-cauldron.org/prg26/cfp
 * Toolchains Track at LPC 2026, October 7th (Prague, Czechia)
  * https://inbox.sourceware.org/gcc/CAKwvOdkaE7nHQbMRKBHmY6jE326bx=czi8yeL2qypsOj3Pq+Og@mail.gmail.com/
  * https://lpc.events/event/20/abstracts/

General/big GNU toolchain news:
 * Acceptance of GCC WebAssembly Backend
  * https://inbox.sourceware.org/gcc/CAGWvny=AE17wQU5mfz8UGWybVBSsb_ffqHcthS78g8zdzK6xSw@mail.gmail.com/
 * Joel Brobecker is stepping down as a gdb release manager
  * https://inbox.sourceware.org/gdb-patches/[email protected]/T/

GCC easy issue to tackle of the week:
 * strlen(s) != 0 not folded into *s (when separate statements)
  * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92408
  * Reach out to Andrea Pinski <[[email protected]](mailto:[email protected])> for
mentoring on this issue.
 * Previous ones are listed on https://gcc.gnu.org/wiki/EasyIssuesOfTheWeek

GCC commits:
 * https://gcc.gnu.org/r17-1560 ... r17-1732  173 commits
 * Ada updates (Thanks Marc)
  * Bug fixes.
  * Diagnostics improvements.
  * Constructor Flare extension adjustments.
  * https://gcc.gnu.org/r17-1633-g881cb10e96d875 ...
https://gcc.gnu.org/r17-1653-g52f6d044261933
  * https://gcc.gnu.org/r17-1688-g343265c50f930c ...
https://gcc.gnu.org/r17-1701-g3b0af59dc9e67f
 * match.pd: Recognize integer spaceship operator patterns
  * https://gcc.gnu.org/r17-1582-g7659926b80deaf
 * c++, libcpp: Add -std=c++2[9d] and -std=gnu++2[9d] options
  * https://gcc.gnu.org/r17-1595-g0c5c6249a2e9a7
 * prange was improved and is in use
  * https://gcc.gnu.org/r17-1601-g8b45cd81fc3509 ...
https://gcc.gnu.org/r17-1604-gca582ee36820a3
 * Add vec_deconstruct costing kind
  * https://gcc.gnu.org/r17-1655-g7d351b07e5b85c
 * match: mask/sub sign-extension idiom not canonicalized to sign extension
  * https://gcc.gnu.org/r17-1680-gc05164c348242b
 * match: Optimize bit_ior/bit_and {bit_not} rshift to min/max
  * https://gcc.gnu.org/r17-1683-g43356828d897ad
 * PHIOPT (ifcvt): load commonization/factoring
  * https://gcc.gnu.org/r17-1703-g3c0fd2976ab4f4 ...
https://gcc.gnu.org/r17-1705-gcf64e6b0e07355
 * Match: Support unsigned scalar SAT_MUL form 13
  * https://gcc.gnu.org/r17-1730-g971f8d5b5fd5ce ...
https://gcc.gnu.org/r17-1732-ga05799c29c50d7

GCC discussion:
 *

GCC bugzilla stats
 *  128 new issues filed
 *  91 issues closed

binutils/gdb commits:
 *

gdb discussion:
 *

binutils discussion:
 *

glibc commits:
 * riscv: Add RVV memmove for both multiarch and non-multiarch builds
  * https://sourceware.org/cgit/glibc/commit/?id=60f7247847ba7244541fc783079c298416756399

glibc discussion:
 *

I've been working on a high-impact project for the past couple years that's led me further into C, infosec, and compilers than I ever thought I wanted to be. GCC has been my companion the entire way. I am old, and I am oldschool. I don't have makefiles, I don't do git, and my IDE is Xed with C code highlighting turned off because I don't like it doubling up my quotes for me. My first programming language was Visual Basic 3 when VB3 was new and hot.

This morning I reached the final stage, and I just pushed a 1.1MB, zero dependency -O3 static binary to my test server for stressing. Version 1.8, bumped from 1.7.16, where the whole 1.7 series has been running in prod on a website with ~1.1M monthly users. When it passes it'll go to prod and become a release candidate a month after that. Two years of my life, 2200 lines of code, and my own invention that doesn't exist anywhere else are finally about to go Gold.

GCC is built the way I like my tools to be built: Simple, easy to understand at a basic level, flexible if you want to get fancy, and obscenely powerful without rubbing your nose in it. It is bar-none my favorite C compiler and I would not have come this far if I had to put up with the bullshit of Clang, VSCode, Code:Blocks, or others. I love a Swiss army knife, but abhor a "Swiss army laser chainsaw with mandatory tactical nukes and shark robot features." And I don't need no stinking AI anything. Even code completion annoys me.

Yes I have a beard and yes its turning grey. But from the bottom of my heart to the GCC devs - I thank you all the same.

Is there any way to pass a max-devirt-targets value using Pragmas? We've been fighting massive false positives do to that upgrading to GCC 16 (Something is very wrong in GCC 16, its got some major optimizer issues). Its not super easy to add in general to our build system, and we'd also prefer to target changing that value only to the specific places that fail.

Release updates for GNU toolchain:
 *  GCC 15 branch is frozen for GCC 15.3.0 release
  * https://inbox.sourceware.org/gcc/[email protected]/
 * GCC 15.3.0 RC1 was done
  * https://inbox.sourceware.org/gcc/[email protected]/
 * Schedule for the [glibc] 2.44 release
  * https://inbox.sourceware.org/libc-alpha/[email protected]/

GNU toolchain conference reminders:
 * GNU Tools Cauldron 2026, Fri-Sun, October 2-4 (Prague, Czechia)
  * https://gcc.gnu.org/wiki/cauldron2026
  * https://conf.gnu-tools-cauldron.org/prg26/cfp
 * Toolchains Track at LPC 2026, October 7th (Prague, Czechia)
  * https://lpc.events/event/20/abstracts/

General/big GNU toolchain news:
 * GCC AI policy working group - 2026-06-05
  * https://inbox.sourceware.org/gcc/CAH6eHdTQYgaaGJomvr1fgoCJazJZb3hRuT+fgJ_BZriQBFANng@mail.gmail.com/
  * http://gcc.gnu.org/wiki/working-group-ai-policy

GCC easy issue to tackle of the week:
 * MAX(x, -1) can use orr with ash operand (aarch64)
  * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125640
  * This one is different from previous weeks; a target specific improvement
* the Compile Farm has a few aarch64 machines that can be used for
building/testing on
* https://gcc.gnu.org/wiki/CompileFarm
  * Reach out to Andrea Pinski <[[email protected]](mailto:[email protected])> for
mentoring on this issue.
  * Previous ones are listed on https://gcc.gnu.org/wiki/EasyIssuesOfTheWeek

GCC commits:
 * https://gcc.gnu.org/r17-1051 - r17-1416 :  365 commits
 * Summary of Ada changes (Thanks Marc)
  * Bug fixes and code cleanup
  * Document the Ref attribute + other documentation cleanup
  * Adjust some compiler diagnostics
  * Implement AI12-0331 Binding Interpretation
  * Flare's constructor fix and improvements
  * Support for Constant_Reference in Iterable aspect and update
corresponding documentation.
  * Fix conformance with RM where an incorrect exception was raised in
some IO  procedures.
 * Removal of all of the -Wstrict-overflow code
  * https://gcc.gnu.org/r17-1051 ... https://gcc.gnu.org/r17-1058 and
https://gcc.gnu.org/r17-1151
 * Rust FE merge
  * https://gcc.gnu.org/r17-1072 ... https://gcc.gnu.org/r17-1090
 * RISC-V: Add zvfofp8min ISA extension support
  * https://gcc.gnu.org/r17-1226-g8bef821de3b31c
 * aarch64: Make Uc[ij] constraints public
  * https://gcc.gnu.org/r17-1254-g090f3e78a10b5c
 * RISC-V: Add XuanTie C908 tuning and scheduler model
  * https://gcc.gnu.org/r17-1270-g980ea5fb524173
 * cselim: Allow middle_bb to have more than one statement
  * https://gcc.gnu.org/r17-1273-g391ee229b737eb
 * Add __builtin_{bswap,bitreverse}g type-generic builtins
  * https://gcc.gnu.org/r17-1367-g9ab08d664545bc
 * forge: Add a prototype CODEOWNERS file
  * https://gcc.gnu.org/r17-1378-g293f343e2ce8b6

GCC discussion:
 *

GCC bugzilla stats
 * 115 new issues filed
 * 75 issues closed

glibc commits:
 * riscv: Add RVV memcmp, memccpy, memchr, strchr, and strrchr for
both multiarch and non-multiarch builds
  * https://sourceware.org/cgit/glibc/log/?id=2efc7026287273b4b3a1ce1a7b27791d3d860a5c&qt=range&q=c275c424b324ea525a526812ba2b4a56d47bfe61...2efc7026287273b4b3a1ce1a7b27791d3d860a5c
 *
glibc discussion:
 *
binutils/gdb commits:
 * gdb/aarch64: record/replay support for LRCPC3
  * https://sourceware.org/cgit/binutils-gdb/commit/?id=ec6bbd2e0cb4d141db9048b0b5d5c0bcaa66c284
 *
gdb discussion:
 * RFC: prototype of C extensions using the Python limited API
  * https://inbox.sourceware.org/gdb/[email protected]/

binutils discussion:
 *

Release updates for GNU toolchain:
* None

GNU toolchain conference reminders:
 * FOSSY 2026 toolchain track North America, Aug 6-9 (Vancouver, Canada)
   * Call for Proposals: https://2026.fossy.ca/call-for-proposals/
 * GNU Tools Cauldron 2026, Fri-Sun, October 2-4 (Prague, Czechia)
   * https://gcc.gnu.org/wiki/cauldron2026
  * https://conf.gnu-tools-cauldron.org/prg26/cfp
 * Toolchains Track at LPC 2026, October 7th (Prague, Czechia)
  * https://lpc.events/event/20/abstracts/

General/big GNU toolchain news:
 * GCC AI policy working group - 2026-05-29
  * https://inbox.sourceware.org/gcc/CAH6eHdR2bP+C9OvWRrddSRgcnwSLyWGrv0ADpc_m8eUMXociEA@mail.gmail.com/
  * http://gcc.gnu.org/wiki/working-group-ai-policy
 * The Linux Test Project (LTP) has been released for May 2026
  * https://inbox.sourceware.org/libc-alpha/[email protected]/T/
 * (missed from last week) Office Hours for the GNU Toolchain
  * was held on 2026-05-21
  * notes:
   * https://gcc.gnu.org/wiki/OfficeHours#Meeting:_2026-05-21_.40_1100h_EST5EDT
   * https://gcc.gnu.org/wiki/OfficeHours#Meeting:_2026-05-21_.40_0900h_.22Asia.2FKolkata.22

GCC easy issue to tackle of the week:
 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125274
  * BOOL_BITFIELD in system.h can be removed
  * This one is slightly more involved this week and it is a cleanup
rather than a missed optimization.
  * Reach out to Andrea Pinski <[[email protected]](mailto:[email protected])> for
mentoring on this issue.
  * Previous ones are listed on https://gcc.gnu.org/wiki/EasyIssuesOfTheWeek

GCC commits:
 * https://gcc.gnu.org/r17-712 - https://gcc.gnu.org/r17-1050 : 339
commits (Huge weeks folks)
 * Summary of Ada changes (Thanks Marc)
  * Many bug fixes, doc enhancements and technical debt cleanup.
  * Flare progress (Constructor, finally)
  * More work on Unsigned base range
  * Better SARIF support
  * More VAST (Verifier for the Ada Semantic Tree) enhancement
(Aspect/Pragma check, Entity chain check).
  * Add debug routine for printing entity chains
  * Adjust envp handling (stop using gnat_envp)
 * aarch64: SVE2.2/SME2.2 support
  * https://gcc.gnu.org/r17-969 ... https://gcc.gnu.org/r17-981
 * AVR: Support [[len=<words]] notes in inline asm to specifty its size.
  * https://gcc.gnu.org/r17-892-geaf619a0f552d7
 * aarch64: improve vector creation (SIMD and SVE)
  * https://gcc.gnu.org/r17-896-g44a31df54837ad ...
https://gcc.gnu.org/r17-899-g52d5a8870d2108
 * ext-dce improvements
  * https://gcc.gnu.org/r17-844-gdcba59a336f530 ...
https://gcc.gnu.org/r17-845-g4a97237ac39074
 * libstdc++: Implement P3567R2 flat_meow fixes
  * https://gcc.gnu.org/r17-908-gf46eccc9409136
 * vect: Don't generate scalar epilogue if not needed
  * https://gcc.gnu.org/r17-837-g8af2e8e49d6e5d
 * libcody: allow non-ASCII module names
  * https://gcc.gnu.org/r17-920-g7512f0bbbea33c

GCC discussion:
 * register_operand in non-strict RTL
  * https://inbox.sourceware.org/gcc/[email protected]/T/

GCC bugzilla stats
 * 83 new issues filed
 * 56 issues closed

glibc commits:
 * Arch64: Add support for SVE2 ifuncs
  * https://sourceware.org/cgit/glibc/commit/?id=b26cc4fbb74f516fc2b26bdfe7e524392d940250
 * malloc: aarch64: Remove broken memory tagging
  * https://sourceware.org/cgit/glibc/commit/?id=70be9819b5eb7ed0050cffb45113332f96f5a55f

glibc discussion:
 *

binutils/gdb commits:
 * gdb/aarch64: Test record/replay support for CSSC
  * https://sourceware.org/cgit/binutils-gdb/commit/?id=faa57d5233c0a69accf8073efad2089c095b53bc
 * gdb/aarch64: record/replay support for LSE128
  * https://sourceware.org/cgit/binutils-gdb/commit/?id=ca85c8b554c85b0baff9494a1356333c6e5953d5

gdb discussion:
 *

binutils discussion:
 * macho gas support
  * https://inbox.sourceware.org/binutils/[email protected]/T/

General/big GNU toolchain news:
 * BPF support in GCC 16 and beyond
  * https://lwn.net/Articles/1071973/
 * Building a Host-Tuned GCC to Make GCC Compile Faster
  * https://peter0x44.github.io/posts/super-gcc/

GCC easy issue to tackle of the week:
 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125442
  * Missed (x == 0) | ((x | y) == 0) to (x == 0)
  * Reach out to Andrea Pinski [email protected] for mentoring on this issue.

GCC commits (52 commits):
 * middle-end: Optimize reversed CRC table-based
  * https://gcc.gnu.org/r17-567-g7034f85fb6577a
 * RISCV: Add xt-c9501fdvt CPU
  * https://gcc.gnu.org/r17-579-g6a18e85213ee6c
 * rs6000: Adding ISA 3.0 atomic memory operation instructions
  * https://gcc.gnu.org/r17-586-g6953b4ea86a669
 * AArch64: Add PIC/PIE support to large model
  * https://gcc.gnu.org/r17-652-gb4aa063fe4a414
 * libffi: Sync with libffi 3.5.2
  * https://gcc.gnu.org/r17-657-g68927076526a15
 * c++: Implement C++26 P3074R7/CWG3189 - trivial unions
  * https://gcc.gnu.org/r17-671-gca6cd7cb48512d
 * match: Handle X != INT_MIN ? -X : INT_MIN
  * https://gcc.gnu.org/r17-669-g33cd7bbb32c5ee
  * Easy issue of the week: Week 37
 * match: Optimize `(~y & x) ^ y` into (y | x) [PR125104]
  * https://gcc.gnu.org/r17-705-g365e5618bc6fcb
  * Easy issue of the week: Week 36
 * analyzer: improvements
  * https://gcc.gnu.org/r17-609
  * https://gcc.gnu.org/r17-576
  * https://gcc.gnu.org/r17-626
 * libstdc++: optimize std::uninitialized_move to memcpy when possible
  * https://gcc.gnu.org/r17-570-g79e29562907b45

GCC discussion:
 *Time to take the middle-end stringop/array warnings out of -Wall
  * https://inbox.sourceware.org/gcc/CAH6eHdRfEVsGjbJ__kU5AR9BfVdLQZ_iGGDZa=yQnT4fgG2P6w@mail.gmail.com/

GCC bugzilla stats
 * 81 new issues filed
 * 46 issues closed

glibc commits:
 * AArch64: Optimize memcmp for Kunpeng 950
  * https://sourceware.org/cgit/glibc/commit/?id=3237d63b8462764e282cd8de79a02558071d4348
 * x86: Lower non-temporal copy threshold for Hygon
  * https://sourceware.org/cgit/glibc/commit/?id=213ffdfbbae6d4cb4e8dd4a9e3e57c69127620c4
 * x86: Fix non-temporal memset on AMD Zen 3/4/5
  * https://sourceware.org/cgit/glibc/commit/?id=54abc8566fea592e795cb443949266ef206462a8
 * aarch64/SVE: Vectorise special cases for inverse hyperbolics and SVE log1p(f)
  * https://sourceware.org/cgit/glibc/commit/?id=f7eea1b2585b7b8c1f3ee9646627a9cf03fc33f2
  * https://sourceware.org/cgit/glibc/commit/?id=a7b6e534629c821e456955a00cf68bf889a601a8
 
glibc discussion:
 * mailing lists: glibc need or use?
  * https://inbox.sourceware.org/libc-alpha/[email protected]/T/#mc8bc3aa6ed6e7e4f72a6ba2e9f9cdf74c4a0e1e2

binutils/gdb commits:
 * gdb/aarch64: record/replay support for prefetch
  * https://sourceware.org/cgit/binutils-gdb/commit/?id=f6c1ca239d932db39a6f19d9bd343f4f4fddba76
 * gdb: native TLS support on Windows
  * https://sourceware.org/cgit/binutils-g

GNU Tools Weekly News Week 38 (May 17, 2026)

Release updates for GNU toolchain:
* None

GNU toolchain conference reminders:
 * GNU Tools Cauldron 2026, Fri-Sun, October 2-4 (Prague, Czechia)
  * https://gcc.gnu.org/wiki/cauldron2026
  * https://conf.gnu-tools-cauldron.org/prg26/cfp
 * Toolchains Track at LPC 2026, October 7th (Prague, Czechia)
  * https://lpc.events/event/20/abstracts/

General/big GNU toolchain news:
 * Phoronix review of GCC 16 vs GCC 15 and LLVM
  * https://www.phoronix.com/review/gcc-16-vs-clang-22
 * Native Thread Local Storage (TLS) in msys2 toolchain with GCC 16
  * https://www.msys2.org/news/#2026-05-11-native-thread-local-storage-tls-with-gcc-16

GCC easy issue to tackle of the week:
 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109843
 * signbit comparisons -> copysign optimization
 * Reach out to Andrea Pinski <[email protected]> for
mentoring on this issue.

GCC commits:
 * AArch64: Turn on GPR narrowing pass by default
  * https://gcc.gnu.org/r17-445-ge7dcba03064011
 * Enabling POPCNT generation for 32-bit patterns
  * https://gcc.gnu.org/r17-489-g8ca1e887847e2f
 * Add __builtin_bitreverse{8,16,32,64} builtins
  * https://gcc.gnu.org/r17-523-gc564a8be8a1538
 * match.pd: Simplify ((~x) & y) ^ (x | y)
  * https://gcc.gnu.org/r17-542-gab6c415e13ca87
  * Easy issue of the week (April 12, 2026)

GCC discussion:
 * Warnings for partially-unused structured bindings in C++26 mode
  * https://inbox.sourceware.org/gcc/IwntDp_Q1VxRwhn7aMzNxnY2SVNNCEI8BMw2bMGfoymG74jx1ONjefmAtoNwjrkk2xcpHC7nBhKor_UBDinXr4qGnWi5pbKCkaK4G1RRzfQ=@nicula.xyz/T/#u
 * RFC: GCC support for masked compress stores and VPCOMPRESS-style codegen
  * https://inbox.sourceware.org/gcc/[email protected]/T/#u

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


glibc commits:
 * arm: Enable static-pie support
  * https://sourceware.org/cgit/glibc/commit/?id=c2d6afb4a010a46e0fc73bb4619db9c3796a3077

glibc discussion:
 * Updated Contribution Checklist - Preference for plain text emails
  * https://inbox.sourceware.org/libc-alpha/2198255.bB369e8A3T@noumea/T/

binutils/gdb commits:
 *

gdb discussion:
 * Fixing commit dates before pushing
  * https://inbox.sourceware.org/gdb/[email protected]/T/

binutils discussion:
 * RFC: Annotate immediates in x86 disassembly (continued)
  * https://inbox.sourceware.org/binutils/[email protected]/T/

Hi, I'm using gcc 16.1.1 with cflags

CFLAGS  = --std=c17 -gdwarf-5 -gsplit-dwarf -Wall -Wextra -Wfatal-errors -O0 \
              -Wno-cpp -Werror=return-type -D_REENTRANT -Werror=pointer-compare \
              -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -fno-pie -Wl,--gdb-index

It produces .dwo files and GDB works fine. However, when I run

dwp -o out.dwp -v *.dwo

it produces a bunch of "duplicate entry for CU (dwo_id 0x0)" warnings. Not all object files produce this warning, only a half, and this subset is the same every time.

It also worries me that

readelf --debug-dump=info obj.o | grep -A 3 "dwo_id"

doesn't show anything for any of my object files. So it seems that I need some other compiler flag to generate those dwo_ids. Please help, what am I missing?

Hi,

is there any reason why in libstdc++ (16.1.1) the is_exhaustive() member function of std::mdspan is NOT marked const, despite it ultimately only calling either static or const member functions? I have some code that uses this function and it fails to compile when using the latest release of GCC as opposed to, say, Kokkos mdspan.
Simply manually marking the function as const in the <mdspan> header fixes this issue

I tried to change armclang to gcc but now I am getting error about target=aarch64-arm-none-eabi.

What is the solution, anyone knows gcc alternative would work?

update: found alternative for armclang, but finally couldn't find alternative for armlink linker which can process scatter files

Release updates for GNU toolchain:
* GCC 16.1.0 was released
* https://inbox.sourceware.org/gcc/[email protected]/T/#u
* systemtap 5.5 was released
* https://inbox.sourceware.org/systemtap/[email protected]/
* Libabigail 2.10 was released
* https://inbox.sourceware.org/libabigail/[email protected]/

GNU toolchain conference reminders:
* FOSSY 2026 toolchain track North America, Aug 6-9
* Call for Proposals: https://2026.fossy.ca/call-for-proposals/
* GNU Tools Cauldron 2026, Fri-Sun, October 2-4
* https://gcc.gnu.org/wiki/cauldron2026
* https://conf.gnu-tools-cauldron.org/prg26/cfp

General/big GNU toolchain news:
* GSOC 2026 has officially started and welcome to the participants
* https://inbox.sourceware.org/gcc/[email protected]/T/#u
* rustc_codegen_gcc: Progress Report #41
* https://blog.antoyo.xyz/rustc_codegen_gcc-progress-report-41
* New features in GCC 16: Improved error messages and SARIF output
* https://developers.redhat.com/articles/2026/04/28/gcc-16-improved-error-messages-sarif-output

GCC easy issue to tackle of the week:
* `(a & ~CST) ^ CST` -> `a | CST`
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125104
* Reach out to Andrea Pinski [email protected] for mentoring on this issue.

GCC commits:
* gimple-fold: lower mempcpy to memcpy when result is unused
* https://gcc.gnu.org/r17-102-g4765a2e3980749
* c++: constexpr union with no active member
* https://gcc.gnu.org/r17-110-ge9d43010d8ec98
* c, middle-end: Implement C2Y N3747 paper - Integer Sets, v5
* https://gcc.gnu.org/r17-123-gf99eaecb935a4b
* RISC-V supports HWASAN
* https://gcc.gnu.org/r17-150-ge712b42c5e01d7
* analyzer: new warnings
* https://gcc.gnu.org/r17-176
* https://gcc.gnu.org/r17-177
* https://gcc.gnu.org/r17-186
* BB SLP: Enabling reduction root finding for sum-of-diff kind of patterns
* https://gcc.gnu.org/r17-196-g685f665a6c811a
* i386: Support HYGON c86-4g series processors
* https://gcc.gnu.org/r17-203-g2a64a63d982584
* AArch64: Deprecate -mpc-relative-literal-loads

GCC discussion:
* Access to enum definition at run time
* https://inbox.sourceware.org/gcc/CAK3_KpMGe9WQ4iOEistwQKgNrcVaMp=RoE0WD-Dq=SBFpsu+mA@mail.gmail.com/
* Dos and don'ts while removing multilib
* https://inbox.sourceware.org/gcc/[email protected]/
* Optimize unsigned division by constant
* https://inbox.sourceware.org/gcc/CABquowxBS-gSHyw=T1sRbyvJWe8Kr=zmRMpvYYt0BB7jmOMSfA@mail.gmail.com/

GCC bugzilla stats
* 137 new issues filed
* 95 issues closed

glibc commits:
* misc: Optimize getusershell.c
* x86: Enable Prefer_No_AVX512 for Hygon model 0x8

glibc discussion:
* glibc and gitolite permission modelling
* https://inbox.sourceware.org/libc-alpha/[email protected]/T/#u

binutils/gdb commits:
* gprof support for split debuginfo
* Windows gdb: Add non-stop support

I want to try using _BitInt type however program just doesn't compile, my main function is literally just declaration

_BitInt(8) x = 3 ;

but trying to compile with gcc -std=c2x bits.c I get error

bits.c:6:1: warning: implicit declaration of function ‘_BitInt’ [-Wimplicit-function-declaration]
    6 | _BitInt(8) x = 3 ;
      | ^~~~~~~
bits.c:6:11: error: expected ‘;’ before ‘x’
    6 | _BitInt(8) x = 3 ;
      |           ^~

Why doesn't it compile? How do I define variable using _BitInt(N)? gcc version 11.4.0, I compile using gcc bits.c -std=c2x

Here's the test code I'm working with in an attempt to actually do so:

main.h: ```

include <stdio.h>

main.c:

define _INCLUDE(HASH,FILE)\

HASH##include FILE

define INCLUDE(FILE) _INCLUDE(##,FILE)

INCLUDE("main.h") int main( void ) { puts("Hello World!"); return 0; } ```

Edit: Got a little closer:

main.c: ```

define _HASH

define _PCMD(CMD)\

_HASH##CMD

define INCLUDE(PATH) _PCMD(include PATH)

INCLUDE("main.h") int main( void ) { puts("Hello World!"); return 0; } ```