Re: AVR: Support .gnu_attribute to encode the size of [long] double
Project / Subsystem
binutils / avr
Date
2026-09-02
Proposer
Georg-Johann Lay <avr@gjlay.de>
Source type
public_inbox
Consensus
Proposed
Sentiment
—/10
Technical tradeoffs
- • Increases the complexity of ELF parsing and attribute handling in binutils.
- • Ensures ABI compatibility, preventing potential runtime errors or difficult-to-debug issues.
All attributes
- project
- binutils
- subsystem
- avr
- patch_id
- —
- discussion_id
- 55570124-c5b7-4065-ab90-11a34104bd94@gjlay.de
- source_type
- public_inbox
- title
- Re: AVR: Support .gnu_attribute to encode the size of [long] double
- headline
- AVR: Support .gnu_attribute to encode the size of [long] double
- tldr
- Adds .gnu_attribute support to binutils for AVR to encode double/long double sizes, enabling ABI compatibility checks.
- proposer
- Georg-Johann Lay <avr@gjlay.de>
- consensus
- Proposed
- outcome
- proposed
- sentiment_score
- —
- technical_tradeoffs
-
- • Increases the complexity of ELF parsing and attribute handling in binutils.
- • Ensures ABI compatibility, preventing potential runtime errors or difficult-to-debug issues.
- series_id
- —
- series_role
- standalone
- series_parts
- []
- tags
-
- • avr
- • elf
- • attributes
- • abi
- • linker
- bugzilla_url
- —
- date
- 2026-09-02T00:00:00.000Z
Re: AVR: Support .gnu_attribute to encode the size of [long] double
This patch introduces support for .gnu_attribute tags (Tag_GNU_AVR_BITS_DOUBLE and Tag_GNU_AVR_BITS_LONG_DOUBLE) in binutils for the AVR architecture. This allows the compiler to encode the size of double and long double (32 or 64 bits) into object files. The linker can then use these attributes to detect and reject attempts to link object files with incompatible floating-point ABI settings, ensuring ABI consistency.