I was trying to use scan-build with cmake.
Following scan-build make after scan-build cmake.
But when using scan-build, it is identifying CXX compiler as GNU 9.1.0. But if we don't use scan-build it properly identify CXX as clang. Because of CXX compiler identified as GNU 9.1.0, checks for some diagnostic flags in clang (eg, Wunreachable_code_break, Werror_range_loop_analysis) are getting failed.
Output, while using scan-build:
scan-build: Using '../clang/9.0.0/bin/clang-9' for static analysis
-- The CXX compiler identification is GNU 9.1.0
-- Check for working CXX compiler: ../clang/9.0.0/libexec/c++-analyzer
-- Check for working CXX compiler: ../clang/9.0.0/libexec/c++-analyzer -- works
Output, without scan-build:
-- The CXX compiler identification is Clang 9.0.0
-- Check for working CXX compiler: ../clang/9.0.0/bin/clang++
-- Check for working CXX compiler: ../clang/9.0.0/bin/clang++ -- works
How to make sure scan-build have to identify clang as CXX compiler?
Reading the Manual
The script uses simple heuristics to determine which compiler should be used (it defaults to clang on Darwin and gcc on other platforms).
...
scan-build provides the --use-cc and --use-c++ options to hardwire which compiler scan-build should use for building your code.
You'll want to change the CMake configuration so that the call to scan-build looks like...
scan-build --use-c++ ${CMAKE_CXX_COMPILER} ...