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refactor: better include what you use / clang-tidy info

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Henry Schreiner 2020-09-10 22:57:02 -04:00
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chapters/features/utilities.md
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@ -29,53 +29,55 @@ Set the following properties or `CMAKE_*` initializer variables to the command l
## Clang tidy ## Clang tidy
This is the command line for running clang-tidy, as a list (remember, a semicolon separated string is a list).
Here is a simple example of using Clang-Tidy: Here is a simple example of using Clang-Tidy:
```bash
cmake -S . -B build-tidy -DCMAKE_CXX_CLANG_TIDY="$(which clang-tidy);-fix"
cmake --build build -j 1
```
The `-fix` part is optional, and will modify your source files to try to fix
the tidy warning issued. If you are working in a git repository, this is fairly
safe as you can see what has changed. However, make sure you **do not run your
makefile/ninja build in parallel**! This will not work very well at all if it
tries to fix the same header twice.
If you want to explicitly use the target form to ensure you only call this on
your local targets, you can set a variable (maybe something like
`DO_CLANG_TIDY`) instead of the `CMAKE_CXX_CLANG_TIDY` variable, then add it to
your target properties as you create them. You can find clang-tidy in your path
like this:
```cmake ```cmake
if(CMAKE_VERSION VERSION_GREATER 3.6) find_program(
# Add clang-tidy if available
option(CLANG_TIDY_FIX "Perform fixes for Clang-Tidy" OFF)
find_program(
CLANG_TIDY_EXE CLANG_TIDY_EXE
NAMES "clang-tidy" NAMES "clang-tidy"
DOC "Path to clang-tidy executable" DOC "Path to clang-tidy executable"
) )
if(CLANG_TIDY_EXE)
if(CLANG_TIDY_FIX)
set(CMAKE_CXX_CLANG_TIDY "${CLANG_TIDY_EXE}" "-fix")
else()
set(CMAKE_CXX_CLANG_TIDY "${CLANG_TIDY_EXE}")
endif()
endif()
endif()
``` ```
The `-fix` part is optional, and will modify your source files to try to fix the tidy warning issued. If you are working in a git repository, this is fairly safe as you can see what has changed. However, make sure you **do not run your makefile/ninja build in parallel**! This will not work very well at all if it tries to fix the same header twice.
If you want to explicitly use the target form to ensure you only call this on your local targets, you can set a variable (I usually chose `DO_CLANG_TIDY`) instead of the `CMAKE_CXX_CLANG_TIDY` variable, then add it to your target properties as you create them.
## Include what you use ## Include what you use
This is an example for using include what you use. First, you'll need to have the tool, such as in a docker container: This is an example for using include what you use. First, you'll need to have
the tool, such as in a docker container or with brew (macOS) with `brew install
include-what-you-use`. Then, you can pass this into your build without
modifying the source:
```term ```term
gitbook $ docker run --rm -it tuxity/include-what-you-use:clang_4.0 build # cmake -S . -B build-iwyu -DCMAKE_CXX_INCLUDE_WHAT_YOU_USE=include-what-you-use
``` ```
Then, you can pass this into your build without modifying the source: Finally, you can collect the output and (optionally) apply the fixes:
```term ```term
build # cmake .. -DCMAKE_CXX_INCLUDE_WHAT_YOU_USE=include-what-you-use build # cmake --build build-iwyu 2> iwyu.out
```
Finally, you can collect the output and apply the fixes:
```term
build # make 2> iwyu.out
build # fix_includes.py < iwyu.out build # fix_includes.py < iwyu.out
``` ```
(You should check the fixes first, or touch them up after applying!)
## Link what you use ## Link what you use
There is a boolean target property, `LINK_WHAT_YOU_USE`, that will check for extraneous files when linking. There is a boolean target property, `LINK_WHAT_YOU_USE`, that will check for extraneous files when linking.