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# unknownMacro
**Message**: There is an unknown macro here somewhere. Configuration is required. If AAA is a macro then please configure it. [unknownMacro]
<br/>
**Category**: Configuration<br/>
**Severity**: Error<br/>
**Language**: C and C++
## Description
Cppcheck has found code that is confusing and does not know how to analyze it. This is a critical
error, the analysis of the whole translation unit is aborted. Such error in a header file can mean
that analysis of many source files are aborted.
Your code is probably OK but you need to configure Cppcheck to make Cppcheck understand the code
better.
## How to fix
Review the configuration.
If Cppcheck warns about a macro that is defined in a 3rd party library, and there is a cfg file for
that, then a `--library=` option may be a proper solution.
If Cppcheck warns about a macro that is defined in a header that should be included, make sure that
this header is included properly. Cppcheck must have the include path.
If Cppcheck warns about a compiler keyword add a `-D` that defines this keyword somehow. I.e. if
cppcheck should just ignore the keyword then an `-DKEYWORD=` option is suggested.
## Example
### Example code 1
```
fprintf(stderr, "Generating up to " F_U64 " sequences and up to " F_U64 " bases.\n", nSeqs, nBases);
```
Warning:
canu-2.2/src/seqrequester/src/seqrequester/generate.H:72:41: error: There is an unknown macro here somewhere. Configuration is required. If F_U64 is a macro then please configure it. [unknownMacro]
Fix:
Somehow `F_U64` must be specified for Cppcheck to be able to analyse this properly. Either:
* Add `-DF_U64="x"` to explicitly tell Cppcheck what it should replace F_U64 with. Or;
* Add `-I..` so that headers are included properly.
* If the symbol is defined in a 3rd party library adding a corresponding `--library=` might solve such issue.
### Example code 2
```
BOTAN_FUNC_ISA("crypto")
void AES_128::hw_aes_encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const
```
Warning:
botan-2.19.5+dfsg/src/lib/block/aes/aes_power8/aes_power8.cpp:103:1: error: There is an unknown macro here somewhere. Configuration is required. If BOTAN_FUNC_ISA is a macro then please configure it. [unknownMacro]
Fix:
Somehow `BOTAN_FUNC_ISA` must be specified for Cppcheck to be able to analyse this properly. Either:
* Add `-DBOTAN_FUNC_ISA(X)=` to explicitly tell Cppcheck that BOTAN_FUNC_ISA("crypto") should be ignored. Or;
* Add `-I..` so that headers are included properly.
* If the symbol is defined in a 3rd party library adding a corresponding `--library=` might solve such issue.
|
