[SOLVED] Unset define in cppcheck analyze from cmake generated command

Issue

I have project which i check with cppcheck 1.90, but i want to unset few defines, because it takes a lot of time to check with all defines.

Example: tests.cpp:

int main() {
  int x,y;
#ifdef A
  x = 5;
#else
  x = 10;
#endif

#ifdef B
  y = 5;
#else
  y = 10;
#endif

#ifdef C
  y = 5*x;
#else
  y = 10*x;
#endif

  int c = x+y;
}

When i work with file without project - there is no problem:

cppcheck ../tests.cpp --force -UB
Checking ../tests.cpp ...
Checking ../tests.cpp: A...
Checking ../tests.cpp: C...

I unset define B - and cppcheck don't check compile path with B. But how to do it with file generated from cmake project?

cmake ../ -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
cppcheck --project=./compile_commands.json --force -UB
Checking /home/builder/bugs/test_cppcheck/tests.cpp ...
Checking /home/builder/bugs/test_cppcheck/tests.cpp: A...
Checking /home/builder/bugs/test_cppcheck/tests.cpp: B...
Checking /home/builder/bugs/test_cppcheck/tests.cpp: C...

As i can see cppcheck is ignored "-U" key. Is any way to unset define in that case?

Add cmakefile for test example:

CMakeLists.txt
cmake_minimum_required(VERSION 3.6)

project(tests)

set(SRC
    tests.cpp
)

set(NAME test)
add_executable(${NAME} ${SRC})

Solution

You have an option to edit the CMakeLists file only once and pass arguments as needed, To achieve this you should

In the CMakeLists file add:

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} *hard_coded_flags*")

Command line :

When calling cmake from command line you add CMAKE_CXX_FLAGS = -UB=1 (or any other cppcheck flag), this will concatenate -UB=1 the to the hard_coded_flags.

Answered By - joepol