The Tool Desk
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What compiler qualification does—and does not—establish
A compiler translates C or C++ source code into executable machine code. If it translates code incorrectly, that behavior can affect a safety-related application. Qualification is one way to build confidence that the compiler is suitable for its intended role and configuration.
Qualification is bounded by the evidence and use case. The compiler family and release, target, option settings, optimization level, and applicable standard all matter. Evidence for one compiler build or option profile should not be assumed to cover another.
- It can provide: documented evidence about a defined compiler configuration and its behavior, plus information about known issues developers may need to avoid.
- It does not provide: proof that the compiler has no defects, certification of the application, or a substitute for applicable application verification.
The Solid Sands B.V. 2022 paper behind this topic says qualification should help detect malfunctions and make known issues available to developers. Its abstract says, “Compiler qualification saves time and money.” Treat that as the paper’s thesis, not as an independently established industry-wide savings result.
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Why qualification can change the application-testing burden
A team generally needs evidence that its development workflow can reveal compiler malfunctions affecting the application. The Solid Sands paper presents two broad approaches: qualify the compiler for the intended use case, or rely on application testing that can expose compiler problems, including target testing and machine-code-level coverage analysis.
The paper argues that the second approach may require additional testing and analysis, and that this work can recur as the application changes. With a qualified compiler, it says, application testing does not have to account for compiler-introduced artifacts in the same way. That is an argument about the described functional-safety context—not a regulator’s blanket instruction to reduce testing. The project still needs its applicable application tests and other assurance activities.
Why source coverage alone may not be enough
The paper asks, “But is source code coverage analysis safe enough if the compiler is not qualified?” Its explanation is that optimization can transform control flow, so source-level coverage may not show whether all relevant paths in generated machine code have been exercised.
In one experiment reported by Solid Sands B.V. in 2022, a simple loop achieved 100% source MC/DC coverage while 20% of its generated code remained uncovered; no more than 3 of 11 generated branches were exercised in both directions. These are results from that paper’s example, not general statistics for C or C++ compilers. They illustrate why a project should consider the compiler and coverage method together rather than treating source coverage as universal evidence of correct translation.
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Why optimization settings matter
The paper also asks, “Does one need to use the compiler at a higher optimization level than -O0?” Its appendix reports that its sample ran three times faster at -O1 than at -O0, with an additional factor of six at -O2; it describes the -O0-to–O2 difference as a factor of eighteen. Those are results for the paper’s simple example, not typical or guaranteed performance gains.
The qualification implication is more general: if the deployed project uses optimization, evidence limited to a different setting may not cover the actual use case. Confirm that the qualification scope includes the options and optimization level used for deployment.
Qualification depends on the standard and tool role
There is no single qualification rule that applies to every compiler in every project. The relevant approach depends on the governing standard, the compiler’s role in the workflow, the project’s risk or classification, and the intended use.
For aviation, EASA’s AMC-20 guidance refers to ED-12C/DO-178C Section 12.2 and ED-215/DO-330 as an acceptable method for tool qualification. It also discusses legacy software contexts and using the assigned software level to determine the required tool qualification level. This does not mean every compiler in every project must be qualified; teams need to establish the applicable regulatory and project context. Read EASA’s AMC-20 guidance.
Vendor and industry-group materials describe particular scopes rather than universal approvals:
- Texas Instruments: TI says its Safety Compiler Qualification Kits support development under IEC 61508, ISO 26262, and EN 50657. Its Safety and Security kits also address ISO 21434. These are TI-specific offerings, not evidence that other compilers meet those standards. See TI’s kit details and current compiler-family versions.
- LLVM Qualification Group: The group coordinates work toward using LLVM components in safety-critical applications spanning IEC 61508, IEC 62304, ISO 26262, DO-178C, and EN 50716. Its existence and public technical outputs do not constitute blanket qualification of every LLVM release or configuration. View the LLVM Qualification Group directory.
- Arm Compiler for Embedded FuSa: Arm markets this as a qualified C/C++ toolchain assessed by TÜV SÜD, and says its qualification-kit documentation can inform a project’s tool assessment. Verify the current release, target, scope, and relevant certificate or kit documents for the intended deployment. See Arm’s product information.
These standards and offerings are not interchangeable. A historical 2013-era TI/Validas/ACE paper describes model-based qualification for TI’s ARM compiler and notes that standards use different tool-confidence categories; use the current governing standard and project guidance for compliance decisions. Read the TI/Validas/ACE paper.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to assess a qualification claim for your project
Before relying on a vendor kit, in-house process, or toolchain qualification, compare its scope with the configuration and assurance needs of the project.
- Identify the governing standard and tool role. Establish which standard applies and how the compiler is used in the workflow. Determine the project’s classification or required level rather than assuming a universal category.
- Match the exact configuration. Check compiler family and release, target, options, and optimization profile against the deployed build. A broad product name alone does not establish that the project’s configuration is covered.
- Review the evidence and its limits. Examine the qualification plan and report, safety manual, assessment materials, validation results, known issues, and any stated scope restrictions.
- Find out what the project must still do. Confirm whether the kit requires user testing, validation, or additional assessment, and identify the application-level verification that remains necessary.
- Plan for changes. Determine how compiler updates, target changes, or option changes affect the evidence and whether reassessment or requalification is expected.
TI says its kits are free to TI customers, require no qualification test execution by the user, include a compiler coverage compare feature, and have been independently assessed by TÜV Nord. TI lists materials including tool classification, a qualification plan and report, a safety manual, a user guide, a TÜV Nord assessment report, internal release validation results, and an instrumented compiler. Availability and versions vary by compiler family and release, so the current kit page is the place to verify the exact offering. These claims describe TI’s kits only.
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When qualification is likely to be worthwhile
Qualification is most useful when the project needs structured, configuration-specific evidence about a compiler’s role in a safety-critical workflow and that evidence fits the governing standard. It may also help avoid repeatedly trying to establish compiler behavior through extensive application-specific machine-code analysis, as the Solid Sands paper argues.
It is less useful to treat a qualification label as a shortcut: if the evidence does not cover the deployed version, target, options, or intended role, it may not answer the project’s assurance question. The paper characterizes compiler source code as being “in the order of 2 to 5 million lines of code”; this is its description, not an independently verified current estimate. The practical decision is whether the available qualification evidence matches the use case better than the alternative verification evidence the project would need to produce.
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