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Chapter 2. The Clang compiler

Clang is an LLVM compiler front end for the C-based languages C, C++, Objective C/C++, OpenCL, and Cuda.

LLVM Toolset is distributed with Clang 12.0.1.

2.1. Prerequisites
リンクのコピー

LLVM Toolset is installed.
For more information, see Installing LLVM Toolset.

2.2. Compiling a source file
リンクのコピー

Use the Clang compiler to compile source files as well as assembly language source files. Clang creates an executable binary file as a result of compiling. To be able to debug your code, enable debug information by adding the -g flag to your Clang commands.

Note

To compile a C++ program, use clang++ instead of clang.

Procedure

To compile your program, run the following command:

On Red Hat Enterprise Linux 7:
```
scl enable llvm-toolset-12.0 'clang -o -g <binary_file> <source_file>'
```
```
$ scl enable llvm-toolset-12.0 'clang -o -g <binary_file> <source_file>'
```
Copy to Clipboard Toggle word wrap
- Replace <binary_file> with the desired name of your output file and <source_file> with the name of your source file.
On Red Hat Enterprise Linux 8:
```
clang -o -g <binary_file> <source_file>
```
```
$ clang -o -g <binary_file> <source_file>
```
Copy to Clipboard Toggle word wrap
- Replace <binary_file> with the desired name of your output file and <source_file> with the name of your source file.
On Red Hat Enterprise Linux 9:
```
clang -o -g <binary_file> <source_file>
```
```
$ clang -o -g <binary_file> <source_file>
```
Copy to Clipboard Toggle word wrap
- Replace <binary_file> with the desired name of your output file and <source_file> with the name of your source file.

2.3. Running a program
リンクのコピー

The Clang compiler creates an executable binary file as a result of compiling. Complete the following steps to execute this file and run your program.

Prerequisites

Your program is compiled.
For more information on how to compile your program, see Compiling a source file.

Procedure

To run your program, run in the directory containing the executable file:

./<binary_file>

$ ./<binary_file>

Copy to Clipboard

Toggle word wrap

Replace <binary_file> with the name of your executable file.

2.4. Linking object files together
リンクのコピー

By linking object files together, you can compile only source files that contain changes instead of your entire project.
When you are working on a project that consists of several source files, use the Clang compiler to compile an object file for each of the source files. As a next step, link those object files together. Clang automatically generates an executable file containing your linked object files. After compilation, link your object files together again.

Note

To compile a C++ program, use clang++ instead of clang.

Procedure

To compile a source file to an object file, run the following command:
- On Red Hat Enterprise Linux 7:
  $ scl enable llvm-toolset-12.0 'clang -o <object_file> -c <source_file>'
  Copy to Clipboard Toggle word wrap
  - Replace <object_file> with the desired name of your object file and <source_file> with the name of your source file.
- On Red Hat Enterprise Linux 8:
  $ clang -o <object_file> -c <source_file>
  Copy to Clipboard Toggle word wrap
  - Replace <object_file> with the desired name of your object file and <source_file> with the name of your source file.
- On Red Hat Enterprise Linux 9:
  $ clang -o <object_file> -c <source_file>
  Copy to Clipboard Toggle word wrap
  - Replace <object_file> with the desired name of your object file and <source_file> with the name of your source file.
To link object files together, run the following command:
- On Red Hat Enterprise Linux 7:
  $ scl enable llvm-toolset-12.0 'clang -o <output_file> <object_file_0> <object_file_1>'
  Copy to Clipboard Toggle word wrap
  - Replace <output_file> with the desired name of your output file and <object_file> with the names of the object files you want to link.
- On Red Hat Enterprise Linux 8:
  $ clang -o <output_file> <object_file_0> <object_file_1>
  Copy to Clipboard Toggle word wrap
  - Replace <output_file> with the desired name of your output file and <object_file> with the names of the object files you want to link.
- On Red Hat Enterprise Linux 9:
  $ clang -o <output_file> <object_file_0> <object_file_1>
  Copy to Clipboard Toggle word wrap
  - Replace <output_file> with the desired name of your output file and <object_file> with the names of the object files you want to link.

Important

At the moment, certain library features are statically linked into applications built with LLVM Toolset to support their execution on multiple versions of Red Hat Enterprise Linux. This creates a small security risk. Red Hat will issue a security erratum in case you need to rebuild your applications due to this risk.

Red Hat advises to not statically link your entire application.

2.5. Additional resources
リンクのコピー

For more information on the Clang compiler, see the official Clang compiler documentation.
To display the manual page included in LLVM Toolset, run:

Note

To compile a C++ program, use clang++ instead of clang.

On Red Hat Enterprise Linux 7:
```
scl enable llvm-toolset-12.0 'man clang'
```
```
$ scl enable llvm-toolset-12.0 'man clang'
```
Copy to Clipboard Toggle word wrap
On Red Hat Enterprise Linux 8:
```
man clang
```
```
$ man clang
```
Copy to Clipboard Toggle word wrap
On Red Hat Enterprise Linux 9:
```
man clang
```
```
$ man clang
```
Copy to Clipboard Toggle word wrap

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Chapter 2. The Clang compiler

2.1. Prerequisites
リンクのコピー

2.2. Compiling a source file
リンクのコピー

2.3. Running a program
リンクのコピー

2.4. Linking object files together
リンクのコピー

詳細情報

試用、購入および販売

コミュニティー

Red Hat ドキュメントについて

多様性を受け入れるオープンソースの強化

会社概要

Theme

Red Hat legal and privacy links

Red Hat legal and privacy links

このコンテンツは選択した言語では利用できません。

Chapter 2. The Clang compiler

2.1. Prerequisitesリンクのコピーリンクがクリップボードにコピーされました!

2.2. Compiling a source fileリンクのコピーリンクがクリップボードにコピーされました!

2.3. Running a programリンクのコピーリンクがクリップボードにコピーされました!

2.4. Linking object files togetherリンクのコピーリンクがクリップボードにコピーされました!

詳細情報

試用、購入および販売

コミュニティー

Red Hat ドキュメントについて

多様性を受け入れるオープンソースの強化

会社概要

Theme

Red Hat legal and privacy links

Red Hat legal and privacy links

2.1. Prerequisites
リンクのコピー

2.2. Compiling a source file
リンクのコピー

2.3. Running a program
リンクのコピー

2.4. Linking object files together
リンクのコピー