Can clang static analyzer (scan-build) be used with cmake --build? - c++

Question

I'd like to use the clang static analyzer command line tool scan-build with the convenience of cmake --build.
Most of the resources I found online seem to indicate you need a two-step process:
scan-build cmake .
scan-build make
For example for this small example program with a bug that scan-build catches:
#include <iostream>
int fun() {
int x;
return x; # main.cpp:5:5: warning: Undefined or garbage value returned to caller
}
int main() {
int a = fun();
std::cout << "Hello, World! " << a << std::endl;
}
CMakeLists.txt:
cmake_minimum_required(VERSION 3.5)
project(test_program)
set(CMAKE_CXX_STANDARD 11)
set(SOURCE_FILES main.cpp)
add_executable(test_program ${SOURCE_FILES})
If I run scan-build cmake --build cmake-build-release/ it does not find the bug, even though the binary is built. Is there anyway to get scan-build to work in a one step process with CMake?

Answer 1

If you want to use the Clang Static Analyzer, you should just set CMAKE_EXPORT_COMPILE_COMMANDS=YES. This will create a compilation database that CSA can read. You don't even need to build your project. The file is located at: /path/to/build/compile_commands.json.
scan-build is designed for projects that can't create a compilation database themselves.
Then you can run:
analyze-build --cdb /path/to/build/compile_commands.json \
--use-analyzer /path/to/clang \
--output /path/to/output
It's worth noting that clang-tidy has all of the CSA checks now. You can use this same compilation database technique to run clang-tidy on your codebase.