Email headers are present on every email you receive via the Internet and can provide valuable diagnostic information like hop delays, anti-spam results and more. If you need help getting copies of your email headers, just read this tutorial. The option appears to be separately supported for both C and C++, so use CMAKE_C_INCLUDE_WHAT_YOU_USE for C code. Note that with Microsoft's Visual C++ compiler, IWYU needs the --driver-mode=cl argument to understand the MSVC options from CMake. There are several ways to check the actual Web document served, including the headers: The i18n Checker The Internationalization Checker tool, developed by the W3C, checks web pages for various internationalisation issues. Foscam ip camera tool for mac?.
For more in-depth documentation, see docs.
Instructions for Users
'Include what you use' means this: for every symbol (type, function, variable, or macro) that you use in
foo.cc
(or foo.cpp
), either foo.cc
or foo.h
should include a .h file that exports the declaration of that symbol. (Similarly, for foo_test.cc
, either foo_test.cc
or foo.h
should do the including.) Obviously symbols defined in foo.cc
itself are excluded from this requirement.This puts us in a state where every file includes the headers it needs to declare the symbols that it uses. When every file includes what it uses, then it is possible to edit any file and remove unused headers, without fear of accidentally breaking the upwards dependencies of that file. It also becomes easy to automatically track and update dependencies in the source code.
CAVEAT
![Mac Tool For Checking If C Headers Are Needed Mac Tool For Checking If C Headers Are Needed](/uploads/1/2/6/1/126127960/444255102.jpg)
This is alpha quality software -- at best (as of July 2018). It was originally written to work specifically in the Google source tree, and may make assumptions, or have gaps, that are immediately and embarrassingly evident in other types of code.
While we work to get IWYU quality up, we will be stinting new features, and will prioritize reported bugs along with the many existing, known bugs. The best chance of getting a problem fixed is to submit a patch that fixes it (along with a test case that verifies the fix)!
How to Build
Include-what-you-use makes heavy use of Clang internals, and will occasionally break when Clang is updated. Usually such discrepancies are detected by build bot and fixed promptly. The master branch follows Clang trunk.
We also have convenience tags and branches for released versions of Clang (called
clang_<version>
, e.g. clang_5.0
). To build against a Clang release, check out the corresponding branch in IWYU before configuring the build. More details in the instructions below.We assume you already have compiled LLVM and Clang libraries on your system, either via packages for your platform or built from source. You can use this mapping table to combine Clang and IWYU versions correctly:
Clang | IWYU version | IWYU branch |
---|---|---|
3.6 | 0.4 | clang_3.6 |
3.7 | 0.5 | clang_3.7 |
3.8 | 0.6 | clang_3.8 |
3.9 | 0.7 | clang_3.9 |
4.0 | 0.8 | clang_4.0-r2 |
5.0 | 0.9 | clang_5.0 |
6 | 0.10 | clang_6.0 |
7 | 0.11 | clang_7.0 |
8 | 0.12 | clang_8.0 |
9 | 0.13 | master |
NOTE: If you use the Debian/Ubuntu packaging available from https://apt.llvm.org, you'll need the following packages installed:
llvm-<version>-dev
libclang-<version>-dev
clang-<version>
Packaging for other platforms will likely be subtly different.
To set up an environment for building:
- Create a directory for IWYU development, e.g.
iwyu
- Clone the IWYU Git repo:
- Presumably, you'll be building IWYU with a released version of LLVM and Clang, so check out the corresponding branch. For example, if you have Clang 6.0 installed, use the
clang_6.0
branch. IWYUmaster
tracks LLVM & Clang trunk: - Best malware removal for mac. Create a build root and use CMake to generate a build system linked with LLVM/Clang prebuilts:(substitute the
llvm-6.0
orllvm-7
suffixes with the actual version compatible with your IWYU branch)or, if you have a local LLVM and Clang build tree, you can specify that asCMAKE_PREFIX_PATH
for IWYU 0.11 and later: - Once CMake has generated a build system, you can invoke it directly from
build
, e.g.
Instructions for building Clang are available at https://clang.llvm.org/get_started.html.
How to Install
If you're building IWYU out-of-tree or installing pre-built binaries, you need to make sure it can find Clang built-in headers (
stdarg.h
and friends.)Clang's default policy is to look in
path/to/clang-executable/./lib/clang/<clang ver>/include
. So if Clang 3.5.0 is installed in /usr/bin
, it will search for built-ins in /usr/lib/clang/3.5.0/include
.Clang tools have the same policy by default, so in order for IWYU to analyze any non-trivial code, it needs to find Clang's built-ins in
path/to/iwyu/./lib/clang/3.5.0/include
where 3.5.0
is a stand-in for the version of Clang your IWYU was built against.Note that some distributions/packages may have different defaults, you can use
clang -print-resource-dir
to find the base path of the built-in headers on your system.So for IWYU to function correctly, you need to copy the Clang
include
directory to the expected location before running (similarly, use include-what-you-use -print-resource-dir
to learn exactly where IWYU wants the headers).This weirdness is tracked in issue 100, hopefully we can make this more transparent over time.
How to Run
The original design was built for Make, but a number of alternative run modes have come up over the years.
Plugging into Make
The easiest way to run IWYU over your codebase is to run
or
(include-what-you-use always exits with an error code, so the build system knows it didn't build a .o file. Hence the need for
-k
.)Include-what-you-use only analyzes .cc (or .cpp) files built by
make
, along with their corresponding .h files. If your project has a .h file with no corresponding .cc file, IWYU will ignore it unless you use the --check_also
switch to add it for analysis together with a .cc file.Using with CMake
CMake has grown native support for IWYU as of version 3.3. See their documentation for CMake-side details.
The
CMAKE_CXX_INCLUDE_WHAT_YOU_USE
option enables a mode where CMake first compiles a source file, and then runs IWYU on it.Use it like this:
or, on Windows systems:
Mac Tool For Checking If C Headers Are Needed Me Lyrics
The option appears to be separately supported for both C and C++, so use
CMAKE_C_INCLUDE_WHAT_YOU_USE
for C code.Note that with Microsoft's Visual C++ compiler, IWYU needs the
--driver-mode=cl
argument to understand the MSVC options from CMake.Using with a compilation database
The
iwyu_tool.py
script predates the native CMake support, and works off the compilation database format. For example, CMake generates such a database named compile_commands.json
with the CMAKE_EXPORT_COMPILE_COMMANDS
option enabled.The script's command-line syntax is designed to mimic Clang's LibTooling, but they are otherwise unrelated. It can be used like this:
or, on Windows systems:
Unless a source filename is provided, all files in the project will be analyzed.
See
iwyu_tool.py --help
for more options.Mac Tool For Checking If C Headers Are Needed In Minecraft
![Mac Tool For Checking If C Headers Are Needed Mac Tool For Checking If C Headers Are Needed](/uploads/1/2/6/1/126127960/585732570.jpg)
Applying fixes
We also include a tool that automatically fixes up your source files based on the IWYU recommendations. Network tool for mac os x. This is also alpha-quality software! Here's how to use it (requires python):
If you don't like the way
fix_includes.py
munges your #include
lines, you can control its behavior via flags. fix_includes.py --help
will give a full list, but these are some common ones:-b
: Put blank lines between system and Google includes--nocomments
: Don't add the 'why' comments next to includes
How to Correct IWYU Mistakes
- If
fix_includes.py
has removed an#include
you actually need, add it back in with the comment '// IWYU pragma: keep
' at the end of the#include
line. Note that the comment is case-sensitive. - If
fix_includes.py
has added an#include
you don't need, just take it out. We hope to come up with a more permanent way of fixing later. - If
fix_includes.py
has wrongly added or removed a forward-declare, just fix it up manually. - If
fix_includes.py
has suggested a private header file (such as<bits/stl_vector.h>
) instead of the proper public header file (<vector>
), you can fix this by inserting a specially crafted comment near top of the private file (assuming you can write to it): '// IWYU pragma: private, include 'the/public/file.h'
'.
Current IWYU pragmas are described in IWYUPragmas.
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