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1551247
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0
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2009-10-11T17:41:53.937
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2009-10-11T17:41:53.937
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1551099
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2
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53
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text
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In a nutshell: Compilers are basically split into two parts. One being the front-end that contains the parser and semantic analysis for the programming language. The front-end produces some kind of intermediate representation of your code. Then there's the backend which takes the stuff the front-end produced, optimizes it, and eventually generates assembly code. <ul> <li><a href="http://gcc.gnu.org/" rel="noreferrer">GCC</a>: well known compiler, contains both front-ends for various languages and back-ends for many processor architectures</li> <li><a href="http://llvm.org/" rel="noreferrer">LLVM</a>: a set of back-ends for various architectures (and other low-level stuff)</li> <li><a href="http://clang.llvm.org/" rel="noreferrer">clang</a>: a new front-end for C, Objective-C, and C++; uses the LLVM back-ends. You'll get more readable errors and warnings from your compiler and shorter compile times. You might also encounter incompatibilities or bugs; clang is a very young project.</li> <li>LLVM-GCC: GCC's front-end with LLVM's back-end. LLVM's back-end is faster than GCC's.</li> </ul> clang's (Objective-)C++ support is far from being complete so it calls llvm-gcc when it encounters a C++ source file. It also contains the static analyzer that is now integrated into Xcode. Some people say LLVM's back-end generates better code than GCC's but your mileage may vary. LLVM also supports link-time optimizations (which you can enable in Xcode's project settings). They may produce faster code. Apple wants to replace GCC with clang in the future because they have a policy against GPLv3 licensed code (GCC 4.2 is the last version that's licensed under GPLv2).
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1. POXcode 3.2.1 GCC CLANG and LLVM demystification
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1. USd0k
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1. POXcode 3.2.1 GCC CLANG and LLVM demystification
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1. COYeah, clang even shows the column of the error, not only the line.
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