clang | Mirror kept for legacy | Code Analyzer library

by llvm-mirror C++ Version: Current License: Apache-2.0

X-Ray Key Features Code Snippets(1)Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | clang Summary

clang is a C++ library typically used in Code Quality, Code Analyzer applications. clang has no bugs, it has a Permissive License and it has medium support. However clang has 1 vulnerabilities. You can download it from GitHub.

Project moved to: //===----------------------------------------------------------------------===// // C Language Family Front-end //===----------------------------------------------------------------------===//. Welcome to Clang. This is a compiler front-end for the C family of languages (C, C++, Objective-C, and Objective-C++) which is built as part of the LLVM compiler infrastructure project. Unlike many other compiler frontends, Clang is useful for a number of things beyond just compiling code: we intend for Clang to be host to a number of different source-level tools. One example of this is the Clang Static Analyzer.

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Quality

Security

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Support

clang has a medium active ecosystem.

It has 2827 star(s) with 1625 fork(s). There are 204 watchers for this library.

It had no major release in the last 6 months.

clang has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of clang is current.

Quality

clang has 0 bugs and 0 code smells.

Security

clang has 1 vulnerability issues reported (0 critical, 0 high, 0 medium, 1 low).

clang code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

clang is licensed under the Apache-2.0 License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

clang releases are not available. You will need to build from source code and install.

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clang Key Features

No Key Features are available at this moment for clang.

clang Examples and Code Snippets

Enables download clang .

python

Lines of Code : 14

License : Non-SPDX (Apache License 2.0)

Copy

def set_tf_download_clang(environ_cp):
  """Set TF_DOWNLOAD_CLANG action_env."""
  question = 'Do you wish to download a fresh release of clang? (Experimental)'
  yes_reply = 'Clang will be downloaded and used to compile tensorflow.'
  no_reply = 'Cl

Community Discussions

Trending Discussions on clang

Why is std::is_copy_constructible_v> true?

Why can't I return std::getline's as-if-boolean result?

Is the C++ syntax: T foo; valid?

Is enum { a } e = 1; valid?

macOS 10.12 brew install openssl issue

What should `foo.template bar()` do when there's both a template and a non-template overload?

Union's default constructor is implicitly deleted

Can one delete a function returning an incomplete type in C++?

Must `throw nullptr` be caught as a pointer, regardless of pointer type?

What should happen if one calls `std::exit` in a global object's destructor?

QUESTION

Why is std::is_copy_constructible_v> true?

Asked 2022-Mar-26 at 23:21

In my version of clang and libc++ (near HEAD), this static_assert passes:

...

ANSWER

Answered 2022-Mar-26 at 23:21

std::vector and other containers (except std::array) are specified to have a copy constructor. This is not specified to be conditional on whether or not the element type is copyable. Only instantiation of the copy constructor's definition is forbidden if the element type is not copyable.

As a result std::is_copy_constructible_v on the container will always be true. There is no way to test whether an instantiation of a definition would be well-formed with a type trait.

It would be possible to specify that the copy constructor is not declared or excluded from overload resolution if the element type is not copyable. However, that would come with a trade-off which is explained in detail in this blog post: https://quuxplusone.github.io/blog/2020/02/05/vector-is-copyable-except-when-its-not/.

In short, if we want to be able to use the container with an incomplete type, e.g. recursively like

Source https://stackoverflow.com/questions/71632098

QUESTION

Why can't I return std::getline's as-if-boolean result?

Asked 2022-Mar-14 at 23:01

A standard idiom is

...

ANSWER

Answered 2022-Mar-14 at 22:53

The boolean conversion operator for std::basic_istream is explicit. This means that instances of the type will not implicitly become a bool but can be converted to one explicitly, for instance by typing bool(infile).

Explicit boolean conversion operators are considered for conditional statements, i.e. the expression parts of if, while etc. More info about contextual conversions here.

However, a return statement will not consider the explicit conversion operators or constructors. So you have to explicitly convert that to a boolean for a return.

Source https://stackoverflow.com/questions/71474982

QUESTION

Is the C++ syntax: T foo; valid?

Asked 2022-Mar-02 at 17:06

The following code compiles and run with Clang (tested on 13, 14, and current git head), but not with GCC.

...

ANSWER

Answered 2022-Mar-02 at 16:35

Without a declaration of field, this isn’t even valid syntax: the < can’t begin a template argument list, and expressions aren’t allowed there in a member-declaration. (With a suitable declaration, it could be an invalid declaration with two types and no variables.) Definitely diagnosable, and definitely a Clang bug.

Source https://stackoverflow.com/questions/71325428

QUESTION

Is enum { a } e = 1; valid?

Asked 2022-Feb-09 at 18:46

A simple question: is enum { a } e = 1; valid?

In other words: does assigning a value, which isn't present in the set of values of enumeration constants, lead to well-defined behavior?

Demo:

...

ANSWER

Answered 2022-Feb-05 at 14:09

From the C18 standard in 6.7.2.2:

Each enumerated type shall be compatible with char, a signed integer type, or an unsigned integer type. The choice of type is implementation-defined, but shall be capable of representing the values of all the members of the enumeration.

So yes enum { a } e = 1; is valid. e is a 'integer' type so it can take the value 1. The fact that 1 is not present as an enumeration value is no issue. The enumeration members only give handy identifiers for some of possible values.

Source https://stackoverflow.com/questions/70988698

QUESTION

macOS 10.12 brew install openssl issue

Asked 2022-Jan-22 at 15:43

Trying to install openssl on homebrew using:

...

ANSWER

Answered 2021-Sep-03 at 15:29

Seems a bug of openssl itself. https://github.com/openssl/openssl/issues/16487

~~What about export SDKROOT="/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk "?~~

Homebrew pre-build packages for some versions of macOS. But it keep dropping this pre-building support for old macOS. On macOS 10.12, you're building openssl from the source code and Xcode command line tool is needed.

Source https://stackoverflow.com/questions/68957915

QUESTION

What should `foo.template bar()` do when there's both a template and a non-template overload?

Asked 2022-Jan-09 at 00:42

A coworker shared this code with me:

run on gcc.godbolt.org

...

ANSWER

Answered 2022-Jan-09 at 00:42

[temp.names]/5 says that a name prefixed by template must be a template-id, meaning that it must have a template argument list. (Or it can refer to a class/alias template without template argument list, but this is deprecated in the current draft as a result of P1787R6 authored by @DavisHerring.)

There is even an example almost identical to yours under it, identifying your use of template as ill-formed.

The requirement and example comes from CWG defect report 96, in which the possible ambiguity without the requirement is considered.

Open GCC bug report for this is here. I was not able to find a Clang bug report, but searching for it isn't that easy. Its implementation status page for defect reports however does list the defect report as unimplemented.

Source https://stackoverflow.com/questions/70635683

QUESTION

Union's default constructor is implicitly deleted

Asked 2021-Dec-20 at 22:48

The following code:

...

ANSWER

Answered 2021-Dec-20 at 22:26

It's all slightly mysterious. gcc behaves the same as clang.

The standard has this to say (emphasis mine):

Absent default member initializers, if any non-static data member of a union has a non-trivial default constructor, copy constructor, move constructor, copy assignment operator, move assignment operator, or destructor, the corresponding member function of the union must be user-provided or it will be implicitly deleted for the union.

But I think the wording is a bit wooly here. I think what they actually mean is that you must provide an initialiser for the member that has (in your example) a non-trivial constructor, like so:

Source https://stackoverflow.com/questions/70428563

QUESTION

Can one delete a function returning an incomplete type in C++?

Asked 2021-Dec-19 at 10:56

In the following example function f() returning incomplete type A is marked as deleted:

...

ANSWER

Answered 2021-Dec-19 at 10:26

Clang is wrong.

[dcl.fct.def.general]

2 The type of a parameter or the return type for a function definition shall not be a (possibly cv-qualified) class type that is incomplete or abstract within the function body unless the function is deleted ([dcl.fct.def.delete]).

That's pretty clear I think. A deleted definition allows for an incomplete class type. It's not like the function can actually be called in a well-formed program, or the body is actually using the incomplete type in some way. The function is a placeholder to signify an invalid result to overload resolution.

Granted, the parameter types are more interesting in the case of actual overload resolution (and the return type can be anything), but there is no reason to restrict the return type into being complete here either.

Source https://stackoverflow.com/questions/70410542

QUESTION

Must `throw nullptr` be caught as a pointer, regardless of pointer type?

Asked 2021-Nov-03 at 18:23

The following program throws nullptr and then catches the exception as int*:

...

ANSWER

Answered 2021-Nov-03 at 18:21

Looks like a bug in Visual Studio, according to the standard [except.handle]:

A handler is a match for an exception object of type E if

[...]

the handler is of type cv T or const T& where T is a pointer or pointer-to->member type and E is std::nullptr_t.

Source https://stackoverflow.com/questions/69822870

QUESTION

What should happen if one calls `std::exit` in a global object's destructor?

Asked 2021-Oct-28 at 07:46

Consider the following code:

...

ANSWER

Answered 2021-Oct-27 at 12:26

[basic.start.main]/4:

If std::exit is called to end a program during the destruction of an object with static or thread storage duration, the program has undefined behavior.

Source https://stackoverflow.com/questions/69737959

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Vulnerabilities

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Install clang

You can download it from GitHub.

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