I'd like to apologize for causing these regressions. Below
I've copied out the relevant parts from the logs. To me it
looks like _Xv is a reserved identifier.
I'll prepare a patch to fix the issue.
On 9/9/25 6:54 AM, ci_not...@linaro.org wrote:
Dear contributor,
Our automatic CI has detected problems related to your patch(es). Please find
some details below.
In arm-eabi cortex-m3 softfp, after:
| commit gcc-16-3649-gc440b585ba3
| Author: Luc Grosheintz <luc.groshei...@gmail.com>
| Date: Thu Sep 4 14:20:28 2025 +0200
|
| libstdc++: Implement constant_wrapper, cw from P2781R9.
|
| This is a partial implementation of P2781R9. It adds std::cw and
| std::constant_wrapper, but doesn't modify __integral_constant_like for
| span/mdspan.
| ... 25 lines of the commit log omitted.
Produces 4 regressions:
|
| regressions.sum:
| Running g++:g++.old-deja/old-deja.exp ...
| FAIL: g++.old-deja/g++.robertl/eb39.C -std=c++26 (test for excess errors)
Code:
4651: template<_CwFixedValue _Xv, typename>
4652: struct constant_wrapper : _CwOperators
4653: {
Compiler error:
/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/arm-eabi/libstdc++-v3/include/type_traits:4651:26:
error: expected '>' before numeric constant
My guess is that _Xv is a reserved name. It's not on the list
of common bad identifiers [1], but it's the only guess I have.
[1]: https://gcc.gnu.org/onlinedocs/libstdc++/manual/source_code_style.html
| FAIL: g++.old-deja/g++.robertl/eb54.C -std=c++26 (test for excess errors)
Same as above.
| UNRESOLVED: g++.old-deja/g++.robertl/eb54.C -std=c++26 compilation failed
to produce executable
Same as above.
| FAIL: g++.old-deja/g++.warn/iomanip.C -std=gnu++26 (test for excess errors)
Same as above.
Used configuration :
*CI config* tcwg_gnu_embed_check_gcc arm-eabi -mthumb -march=armv7-m
-mtune=cortex-m3 -mfloat-abi=softfp -mfpu=auto
*configure and test flags:* --target arm-eabi --disable-multilib
--with-mode=thumb --with-cpu=cortex-m3 --with-float=softfp
--target_board=-mthumb/-march=armv7-m/-mtune=cortex-m3/-mfloat-abi=softfp/-mfpu=auto
qemu_cpu=cortex-m3
We track this bug report under https://linaro.atlassian.net/browse/GNU-1676.
Please let us know if you have a fix.
If you have any questions regarding this report, please ask on
linaro-toolch...@lists.linaro.org mailing list.
-----------------8<--------------------------8<--------------------------8<--------------------------
The information below contains the details of the failures, and the ways to
reproduce a debug environment:
You can find the failure logs in *.log.1.xz files in
*
https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m3_softfp_eabi-build/518/artifact/artifacts/00-sumfiles/
The full lists of regressions and improvements as well as configure and make
commands are in
*
https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m3_softfp_eabi-build/518/artifact/artifacts/notify/
The list of [ignored] baseline and flaky failures are in
*
https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m3_softfp_eabi-build/518/artifact/artifacts/sumfiles/xfails.xfail
Current build :
https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m3_softfp_eabi-build/518/artifact/artifacts
Reference build :
https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m3_softfp_eabi-build/517/artifact/artifacts
Instruction to reproduce the build :
https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/c440b585ba374b6348ef223e4891a717a1f6660c/tcwg_gnu_embed_check_gcc/master-thumb_m3_softfp_eabi/reproduction_instructions.txt
Full commit : See in git+ssh://linar...@gcc.gnu.org/git/gcc.git
