[common] Add support for std::optional in error messages

[gouzil]

PR Category

Execute Infrastructure

PR Types

Devs

Description

在减少 paddlecodec diff 时发现，PD_CHECK 不支持 std::optional 相关输出

相关链接

• Reduce the diff with the pytorch:main branch PFCCLab/paddlecodec#3

cc: @ShigureNyako

是否引起精度变化

否

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[Copilot]

Pull request overview

This PR improves paddle/common/exception.h’s ErrorMessage builder (used by PD_CHECK / PD_THROW) to support formatting std::optional<T> values, so optional values can appear in error messages without compilation failures.

Changes:

• Add a build_string(const std::optional<T>&) overload in common::ErrorMessage to render nullopt or the contained value.
• Add C++ unit tests validating ErrorMessage formatting for std::optional and that PD_CHECK exceptions include optional content.
• Register the new test in test/cpp/utils/CMakeLists.txt.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
paddle/common/exception.h	Adds std::optional formatting support inside ErrorMessage.
test/cpp/utils/exception_test.cc	New tests covering optional formatting + PD_CHECK throwing/message behavior.
test/cpp/utils/CMakeLists.txt	Adds exception_test target so the new tests run in CI.

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[gouzil]

@ShigureNyako 帮我看看 https://github.com/PaddlePaddle/Paddle/actions/runs/23706074064/job/69071406580?pr=78521 ，看起来 Linux-NPU 并没有使用 c++ 17 编译

[gouzil]

@ShigureNyako 排查一下 Coverage 为什么编译的那么慢

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (develop@8309551). Learn more about missing BASE report.

Additional details and impacted files

@@             Coverage Diff             @@
##             develop    #78521   +/-   ##
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  Coverage           ?   100.00%           
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  Files              ?         1           
  Lines              ?         4           
  Branches           ?         0           
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  Hits               ?         4           
  Misses             ?         0           
  Partials           ?         0           

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[SigureMo]

DCU 的 build 机器和其他的不一样，好像没有挂载跨机共享的 CFS，所以 cache 是每个机器独立的，这个 PR merge 后可能会有几个 PR 的 DCU build 会超时挂掉，待 cache 在每台机器上均匀分布之后才能恢复正常……