Re: [TCWG CI] Failure after gdb-12-branchpoint-3046-g969b9a36506: gas: re-work line number tracking for macros and their expansions

[Jan Beulich <jbeulich@suse.com>]

On 14.12.2022 00:54, ci_notify@linaro.org wrote:
> Failure after gdb-12-branchpoint-3046-g969b9a36506: gas: re-work line number tracking for macros and their expansions:
> 
> Results changed to
> -10
> # true:
> 0
> # build_abe binutils:
> 1
> # build_abe bootstrap_O3:
> # FAILED
> # First few build errors in logs:
> # 00:08:36 make[3]: [Makefile:1818: armv8l-unknown-linux-gnueabihf/bits/largefile-config.h] Error 1 (ignored)
> # 00:44:06 make[3]: [Makefile:1818: armv8l-unknown-linux-gnueabihf/bits/largefile-config.h] Error 1 (ignored)
> # 01:01:09 make[3]: [Makefile:1818: armv8l-unknown-linux-gnueabihf/bits/largefile-config.h] Error 1 (ignored)
> # 01:02:40 make[2]: *** [Makefile:25808: compare] Error 1
> # 01:02:40 make[1]: *** [Makefile:25788: stage3-bubble] Error 2
> # 01:02:40 make: *** [Makefile:1063: all] Error 2

All this allows me is to guess that there was a comparison failure of
some of the generated binaries between stage2 and stage3. Would be nice
if such a mail contained more helpful information. 

> * master-arm-bootstrap_O3
> ** Failure after gdb-12-branchpoint-3046-g969b9a36506: gas: re-work line number tracking for macros and their expansions:
> ** https://ci.linaro.org/job/tcwg_gcc_bootstrap-build-master-arm-bootstrap_O3/561/
> 
> Bad  build: https://ci.linaro.org/job/tcwg_gcc_bootstrap-build-master-arm-bootstrap_O3/561/artifact/artifacts

Following this link allows me to prove the suspicion, but the artifacts
don't include any object files, so I can't look at their differences.
Re-creating the apparently problematic assembler input from gcc sources
and passing it through the assembler multiple times doesn't yield any
difference here. Hence I'm lost as to investigating this breakage, and I
have the at least vague feeling that my change may merely have uncovered
an issue which was latently there already before.

Suggestions very welcome,
Jan

> Good build: https://ci.linaro.org/job/tcwg_gcc_bootstrap-build-master-arm-bootstrap_O3/560/artifact/artifacts
> 
> Reproduce current build:
> <cut>
> mkdir -p investigate-binutils-969b9a36506bfb386f8ce30f88f1a6a6ebbaca6e
> cd investigate-binutils-969b9a36506bfb386f8ce30f88f1a6a6ebbaca6e
> 
> # Fetch scripts
> git clone https://git.linaro.org/toolchain/jenkins-scripts
> 
> # Fetch manifests for bad and good builds
> mkdir -p bad/artifacts good/artifacts
> curl -o bad/artifacts/manifest.sh https://ci.linaro.org/job/tcwg_gcc_bootstrap-build-master-arm-bootstrap_O3/561/artifact/artifacts/manifest.sh --fail
> curl -o good/artifacts/manifest.sh https://ci.linaro.org/job/tcwg_gcc_bootstrap-build-master-arm-bootstrap_O3/560/artifact/artifacts/manifest.sh --fail
> 
> # Reproduce bad build
> (cd bad; ../jenkins-scripts/tcwg_gnu-build.sh ^^ true %%rr[top_artifacts] artifacts)
> # Reproduce good build
> (cd good; ../jenkins-scripts/tcwg_gnu-build.sh ^^ true %%rr[top_artifacts] artifacts)
> </cut>