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GeezerVison is showing github.com — gh-101525: configure: Add PIE detection logic for BOLT optimizations compatibility by stratakis · Pull Request #140203 · python/cpython

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@stratakis

@stratakis stratakis commented Oct 16, 2025 •
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BOLT requires the --relocs flag if a binary is built as PIE (Position Independent Executable).

Test if a build system enforces PIE during compilation, via the preprocessor macros, or via linkage via creating a test binary.

If so, -fno-pie and -no-pie flags will not be enforced when --enable-bolt is used and --relocs will be added to the BOLT flags.

This resolves the compilation failure when enabling BOLT optimizations in Fedora, where -pie is enforced during linkage and also hidden inside GCC specs.

Tested with both llvm and gcc, static and shared builds, lto combinations and -fPIE,-pie in CFLAGS, LDFLAGS.

Note: This change adds a dependency on file for unix when using --enable-bolt. I'm not aware of a better way to test for -pie in the linker flags when it's hidden behind GCC specs, unless I grep for the Fedora specific GCC specs, essentially the -specs=/usr/lib/rpm/redhat/redhat-hardened-ld linker flag. file is used in configure here for MacOS builds.

  • Issue: Make BOLT as stable feature #101525

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@stratakis
configure: Add PIE detection logic for BOLT optimizations compatibility
7e151ed 
BOLT requires the --relocs flag if a binary is built as PIE
(Position Independent Executable).

Test if a build system enforces PIE during compilation, via the
preprocessor macros, or via linkage via creating a test binary.

If so, -fno-pie and -no-pie flags will not be enforced when
--enable-bolt is used and --relocs will be added to the BOLT flags.
@stratakis
stratakis requested review from AA-Turner, corona10, emmatyping and erlend-aasland as code owners October 16, 2025 11:06
@bedevere-app bedevere-app Bot added the awaiting review label Oct 16, 2025
@bedevere-app bedevere-app Bot mentioned this pull request Oct 16, 2025
Make BOLT as stable feature #101525
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@github-actions

github-actions Bot commented May 1, 2026

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This PR is stale because it has been open for 30 days with no activity.
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@github-actions github-actions Bot added the stale Stale PR or inactive for long period of time. label May 1, 2026
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@erlend-aasland erlend-aasland Awaiting requested review from erlend-aasland erlend-aasland is a code owner
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@AA-Turner AA-Turner Awaiting requested review from AA-Turner AA-Turner is a code owner
@emmatyping emmatyping Awaiting requested review from emmatyping emmatyping is a code owner

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@stratakis
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