Wikipedia has a nice list of static analyzers for C source code.
Those can be used to find bugs without compiling, executing and debugging NeoMutt.

If you have any questions, please send them to the developers’ mailing list:

Tool Description
Address Sanitizer Check for memory leaks, buffer overflows, etc
Clang-Format Source code formatter
Coccinelle Source code manipulation
Compiler Enable gcc/clang warnings
Coverage Code coverage testing
Coverity Source code analyser
CppCheck Source code analyser
Cproto Function prototype generator
Ctags Source tags generator
Egypt Source code grapher
Include-What-You-Use Header file checker
Scan-Build Source code analyser
Undefined Behaviour Sanitizer Check for undefined behaviour
Valgrind Run time memory checker

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