c++ - How to use the tool include-what-you-use together with CMake to detect unused headers? -


the tool include-what-you-use can used detect unneeded headers. using cmake c++ software project. how can instruct cmake run include-what-you-use automatically on source files of software project?

cmake 3.3 introduced new target property cxx_include_what_you_use can set path of program include-what-you-use. instance cmakelists.txt

cmake_minimum_required(version 3.3 fatal_error) add_executable(hello main.cc)  find_program(iwyu_path names include-what-you-use iwyu) if(not iwyu_path)   message(fatal_error "could not find program include-what-you-use") endif()  set_property(target hello property cxx_include_what_you_use ${iwyu_path})

is able build file main.cc

#include <iostream> #include <vector>  int main() {   std::cout << "hello world!" << std::endl;   return 0; }

and @ same time have include-what-you-use give out warning included header vector not needed.

user@ubuntu:/tmp$ ls ~/hello cmakelists.txt  main.cc user@ubuntu:/tmp$ mkdir /tmp/build user@ubuntu:/tmp$ cd /tmp/build user@ubuntu:/tmp/build$ ~/cmake-3.3.0-rc2-linux-x86_64/bin/cmake ~/hello -- c compiler identification gnu 4.9.2 -- cxx compiler identification gnu 4.9.2 -- check working c compiler: /usr/bin/cc -- check working c compiler: /usr/bin/cc -- works -- detecting c compiler abi info -- detecting c compiler abi info - done -- detecting c compile features -- detecting c compile features - done -- check working cxx compiler: /usr/bin/c++ -- check working cxx compiler: /usr/bin/c++ -- works -- detecting cxx compiler abi info -- detecting cxx compiler abi info - done -- detecting cxx compile features -- detecting cxx compile features - done -- configuring done -- generating done -- build files have been written to: /tmp/build user@ubuntu:/tmp/build$ make scanning dependencies of target hello [ 50%] building cxx object cmakefiles/hello.dir/main.cc.o warning: include-what-you-use reported diagnostics:  /home/user/hello/main.cc should add these lines:  /home/user/hello/main.cc should remove these lines: - #include <vector>  // lines 2-2  full include-list /home/user/hello/main.cc: #include <iostream>  // operator<<, basic_ostream, cout, endl, ostream ---  [100%] linking cxx executable hello [100%] built target hello user@ubuntu:/tmp/build$ ./hello  hello world! user@ubuntu:/tmp/build$

if want pass custom options include-what-you-use, instance --mapping_file can via

set(iwyu_path_and_options     ${iwyu_path}     -xiwyu     --mapping_file=${my_mapping})  set_property(target hello     property cxx_include_what_you_use ${iwyu_path_and_options})

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