Landing: 656d97bbc4b0
Project / Subsystem
gcc / fortran
Date
2026-05-28
Author
Sandra Loosemore
Commit
656d97bbc4b0f4614f1f074ab3ca7c425fe569d2
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- fortran
- patch_id
- —
- commit_hash
- 656d97bbc4b0f4614f1f074ab3ca7c425fe569d2
- source_type
- github
- headline
- Fortran's f_c_string Intrinsic Gets Performance and Docs Boost
- tldr
- Improves efficiency of the `f_c_string` intrinsic in Fortran, adds constant string folding, and provides documentation.
- author
- Sandra Loosemore
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • fortran
- • interoperability
- • optimization
- • documentation
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-05-28T00:00:00.000Z
The f_c_string intrinsic in Fortran was reimplemented for better efficiency. The old implementation performed multiple allocations and copies; the new version folds constant string arguments and uses a single allocation and copy for other cases. This reduces overhead when interoperating with C code. The commit also adds missing documentation for the intrinsic to the gfortran manual.