[llvm] [objdump] Fix dxcontainer tests on big endian host (PR #163427)

Tue Oct 14 11:06:05 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-m68k-linux-cross` running on `suse-gary-m68k-cross` while building `llvm` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/27/builds/17500

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: tools/llvm-objcopy/DXContainer/dump-section.yaml' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/yaml2obj /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/tools/llvm-objcopy/DXContainer/dump-section.yaml -o /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.dxbc
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/yaml2obj /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/tools/llvm-objcopy/DXContainer/dump-section.yaml -o /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.dxbc
# RUN: at line 2
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-objcopy --dump-section=DXIL=/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.bc /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.dxbc
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-objcopy --dump-section=DXIL=/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.bc /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.dxbc
# RUN: at line 3
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-dis /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.bc -o - | /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/tools/llvm-objcopy/DXContainer/dump-section.yaml --check-prefix=BITCODE
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-dis /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.bc -o -
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/tools/llvm-objcopy/DXContainer/dump-section.yaml --check-prefix=BITCODE
# RUN: at line 4
wc -c /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.bc | /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/tools/llvm-objcopy/DXContainer/dump-section.yaml --check-prefix=DXIL-SIZE
# executed command: wc -c /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.bc
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/tools/llvm-objcopy/DXContainer/dump-section.yaml --check-prefix=DXIL-SIZE
# RUN: at line 12
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-objcopy --dump-section=PSV0=/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.psv0 /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.dxbc
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-objcopy --dump-section=PSV0=/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.psv0 /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.dxbc
# RUN: at line 13
wc -c /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.psv0 | /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/tools/llvm-objcopy/DXContainer/dump-section.yaml --check-prefix=PSV0-SIZE
# executed command: wc -c /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.psv0
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/tools/llvm-objcopy/DXContainer/dump-section.yaml --check-prefix=PSV0-SIZE
# RUN: at line 14
od -v -Ax -t x1 /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.psv0 | /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/tools/llvm-objcopy/DXContainer/dump-section.yaml --check-prefix=PSV0-CONTENTS
# executed command: od -v -Ax -t x1 /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/tools/llvm-objcopy/DXContainer/Output/dump-section.yaml.tmp.psv0
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/tools/llvm-objcopy/DXContainer/dump-section.yaml --check-prefix=PSV0-CONTENTS
# .---command stderr------------
# | /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/tools/llvm-objcopy/DXContainer/dump-section.yaml:23:18: error: PSV0-CONTENTS: expected string not found in input
# | # PSV0-CONTENTS: 0000000 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
# |                  ^
# | <stdin>:1:1: note: scanning from here
# | 000000 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
# | ^
# | 
# | Input file: <stdin>
# | Check file: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/tools/llvm-objcopy/DXContainer/dump-section.yaml
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |           1: 000000 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
# | check:23     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
# |           2: 000010 00 00 00 00 00 00 00 00 ff ff ff ff 05 00 00 00 
# | check:23     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           3: 000020 00 00 00 00 00 00 00 00 01 00 00 00 01 00 00 00 
...

```

</details>

https://github.com/llvm/llvm-project/pull/163427