BOLT-WARNING: specifying numeric value "1" for option -icf is deprecated
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Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 76/100
- Issue type
- Bug
- Clarity
- Clearly specified
- Activity status
- Quiet
- Tech stack
- python
- Domain
- build-system
Research direction
Start with configure.ac around line 2258, where BOLT_APPLY_FLAGS hard-codes the deprecated -icf value. Reproduce the warning with the provided --enable-bolt configure command and inspect the related ICF behavior described in pull request 134642. Done means the Linux build no longer emits this BOLT-WARNING.
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Description
Bug report
Bug description:
Building 3.14.5 with gcc 15.2 and --enable-bolt produces this warning:
default: BOLT-WARNING: specifying numeric value "1" for option -icf is deprecated
This line in configure.ac hard codes -icf=1 in BOLT_APPLY_FLAGS:
https://github.com/python/cpython/blob/54a5fd4126df74f7b84d1f8a6a36ef79803f66f9/configure.ac#L2258
This issue mentions ICF behavior: https://github.com/python/cpython/pull/134642
Build environment: Ubuntu 26.04 LTS, gcc 15.2.0, configure with:
./configure --enable-optimizations --with-lto --enable-bolt --enable-safety --enable-slower-safety --with-system-expat CXX=/usr/bin/g++ CFLAGS="-flto=auto" LDFLAGS="-flto=auto"
CPython versions tested on:
3.14
Operating systems tested on:
Linux
- Dominant language
- Python
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