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clang

clang

Clang is a compiler front end for the C, C++, and Objective-C programming languages. It uses the Low Level Virtual Machine (LLVM) as its back end. The combination of clang and LLVM provides the majority of a toolchain, allowing the replacement of the whole GCC stack.

One of clang's primary goals is to better support incremental compilation to allow the compiler to be more tightly tied to the IDE GUI.

Clang is carefully and thoughtfully designed and built to provide the foundation of a whole new generation of C/C++/Objective C development tools.

Clang supports a broad variety of language extensions. These extensions are provided to be compatible with the GCC, Microsoft, and other popular compilers as well as to improve functionality through clang-specific features. The Clang driver and language features are intentionally designed to be as compatible with the GCC compiler as reasonably possible, easing migration from GCC to Clang.

 clang

Price
Free to download

Size
-
License

University of Illinois / NCSA Open Source License

Developer
Chris Lattner and contributors

Website
clang.llvm.org

System Requirements

Support:
Users Manual, Development Mailing List

Selected Reviews:

Features include:

  • Fast compiles and low memory use - the library-based architecture of clang makes it straight-forward to time and profile the cost of each layer of the stack
  • Expressive diagnostics, making the diagnostics (error and warning messages) generated by the compiler be as useful as possible
  • GCC compatibility
  • Modular library based architecture:
    • libsupport - Basic support library, from LLVM
    • libsystem - System abstraction library, from LLVM
    • libbasic - Diagnostics, SourceLocations, SourceBuffer abstraction, file system caching for input source files
    • libast - Provides classes to represent the C AST, the C type system, builtin functions, and various helpers for analyzing and manipulating the AST (visitors, pretty printers, etc)
    • liblex - Lexing and preprocessing, identifier hash table, pragma handling, tokens, and macro expansion
    • libparse - Parsing. This library invokes coarse-grained 'Actions' provided by the client (e.g. libsema builds ASTs) but knows nothing about ASTs or other client-specific data structures
    • libsema - Semantic Analysis. This provides a set of parser actions to build a standardized AST for programs
    • libcodegen - Lower the AST to LLVM IR for optimization & code generation
    • librewrite - Editing of text buffers (important for code rewriting transformation, like refactoring)
    • libanalysis - Static analysis support
    • libindex - Cross-translation-unit infrastructure and indexing support
    • clang - A driver program, client of the libraries at various levels
  • Support diverse clients (refactoring, static analysis, code generation, etc)
  • Allow tight integration with IDEs
  • A real-world, production quality compiler
  • A simple and hackable code base
  • A single unified parser for C, Objective C, C++, and Objective C++
  • Conformance with C/C++/ObjC and their variants
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Last Updated Saturday, May 30 2015 @ 09:55 AM EDT


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