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The following tables list these macros and indicate in which version of the C Standard they were introduced. The following macros are required:
| Macro Name | C90 | C99 | C11 |
|---|---|---|---|
| ✓ | ✓ | ✓ |
|
✓ | ✓ | |
|
✓ | ✓ | ||
| ✓ | ✓ | ✓ |
| ✓ | ✓ | ✓ |
| ✓ | ✓ | ✓ |
| ✓ | ✓ | ✓ |
1) __STDC_VERSION__ was introduced by an Amendment to C90, this version of the C Standard is commonly call C94
The following are optional environment macros:
| Macro Name | C90 | C99 | C11 |
|---|---|---|---|
|
✓ | ✓ | |
|
✓ | ✓ | ||
|
✓ | ||
|
✓ |
The following are optional feature macros:
| Macro Name | C90 | C99 | C11 |
|---|---|---|---|
|
✓ | |||
|
✓ | ✓ | |
|
✓ | ✓ | |
|
| ✓ | ||
|
✓ | ||
|
✓ | |||
|
✓ | ||
|
✓ |
The following is optional and is defined by the user:
| Macro Name | C90 | C99 | C11 |
|---|---|---|---|
__STDC_WANT_LIB_EXT1__ |
| ✓ |
Noncompliant Code Example (Checking Value of Predefined Macro)
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Not testing for language features or the version of the implementation being used can lead to unexpected or undefined program behavior.
Rule | Severity | Likelihood | Remediation Cost | Priority | Level |
|---|---|---|---|---|---|
PRE13-C | Low | Probable | Low | P6 | L2 |
Automated Detection
Tool | Version | Checker | Description | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Axivion Bauhaus Suite |
| CertC-PRE13 | |||||||
| LDRA tool suite |
| Partially implemented |
Related Vulnerabilities
Search for vulnerabilities resulting from the violation of this rule on the CERT website.
Related Guidelines
| ISO/IEC TR 24772:2013 | Pre-processor Directives [NMP] |
| ISO/IEC 9899:2011 | 6.10.8, "Predefined macro names" K.3.7.1, "Copying functions" |
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