LSB Desktop IA-32 is the X86-32 architecture-specific volume of the Linux Standard Base (LSB) Desktop specification. It defines parts of the binary interface that compiled desktop applications can rely on—not a source-level programming guide or a guarantee that every Linux distribution runs every application. The Linux Foundation’s archived LSB 5.0 edition was released on June 3, 2015.
What LSB Desktop IA-32 means
LSB stands for Linux Standard Base. Its specification family describes a system interface for compiled applications and a minimal environment for installation scripts, with the aim of defining a uniform environment for high-volume applications that conform to the standard. The LSB Desktop Specification for X86 is the architecture-specific Desktop volume for IA-32, also described as X86-32.
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This is an ABI specification: an application binary interface describes how compiled software interacts with the operating system and libraries. It is not a source-level API guide explaining how to write an application. The IA-32 volume should be read alongside the common LSB Desktop material; architecture-specific volumes supply details that vary by processor target.
What the specification expects from an implementation
For compiled applications, the LSB specification describes expectations around executable formats and system interfaces, required libraries, and dynamic linking. The architecture-specific and generic Core parts together define the complete Core interface for compiled applications on the processor architecture; the LSB Core Specification for X86 provides the IA-32 Core volume.
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In practical terms, a developer evaluating an IA-32 target should check the relevant LSB module and release, the required ABI and library symbols, and how dynamic linking behaves. A specification is a target for implementations; its existence alone does not establish that a particular distribution supplies every required component or that a specific application will work.
Which edition and date to use
The Linux Foundation archive identifies LSB 5.0 as the approved final version and gives June 3, 2015 as its release date. Its LSB 5.0 Specifications page provides the IA32 Desktop specification in HTML and PDF formats. That date refers to the archived LSB 5.0 edition, not a new 2026 revision.
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There is also a separate ISO catalog record: ISO/IEC 23360-2-3:2021 is listed as the Desktop specification for X86-32 architecture. The ISO catalog’s 2021 designation and the Linux Foundation archive’s LSB 5.0 release date are distinct records; neither should be presented as changing the other’s date.
Compatibility and what it does not guarantee
The specification cautions that an ABI description does not promise complete backward compatibility across major releases. It states: “Since this specification is a descriptive Application Binary Interface, and not a source level API specification, it is not possible to make a guarantee of 100% backward compatibility between major releases.” It also strongly encourages implementors to use symbol versioning so they can support applications conforming to different releases at the same time.
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Therefore, an LSB version number by itself is not a universal compatibility verdict. Compatibility depends on the target architecture, the relevant module and release, the interfaces and symbols an application needs, and the implementation’s behavior. The specification does not establish that any particular current Linux distribution implements every requirement, nor that a given application runs on it.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Certification status
The archived specifications do not establish whether a certification program is currently available or identify currently certified implementations. Do not treat the existence of the LSB documents as evidence of present-day certification or of a distribution’s conformance. Those claims require current, separate verification.
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