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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]
Category: Configuration
Severity: Error
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.