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Comparisons in November 2016 between GCC 4.8.2 versus clang 3.4, on a large harness of test files shows that GCC outperforms clang by approximately 17% on well-optimized source code. Test results are code-specific, and unoptimized C source code can reverse such differences. The two compilers thus seem broadly comparable. [30] [unreliable source]
With the release of GCC 2.95 in July 1999 the two projects were once again united. [25] [18] GCC has since been maintained by a varied group of programmers from around the world under the direction of a steering committee. [26] GCC 3 (2002) removed a front-end for CHILL due to a lack of maintenance. [27]
Apple was a significant user of LLVM-GCC through Xcode 4.x (2013). [44] [45] This use of the GCC frontend was considered mostly a temporary measure, but with the advent of Clang and advantages of LLVM and Clang's modern and modular codebase (as well as compilation speed), is mostly obsolete.
[1] [2] Due to this, development tools for the two languages (such as IDEs and compilers) are often integrated into a single product, with the programmer able to specify C or C++ as their source language. However, C is not a subset of C++, [3] and nontrivial C programs will not compile as C++ code without modification. Likewise, C++ introduces ...
Some features of C11 are supported by the GCC starting with version 4.6, [16] Clang starting with version 3.1, [17] IBM XL C starting with version 12.1, [18] and Microsoft Visual C++ starting with VS 2019 (16.8) [19] in September 2020.
GCC and Clang are two major C compilers popular today, both based on the C11 with updates including changes from later specifications such as C17. [ 29 ] [ 30 ] Any source code written only in standard C and without any hardware dependent assumptions is virtually guaranteed to compile correctly on any platform with a conforming C implementation.
However, GCC's nested functions, unlike blocks, must not be called after the containing scope has exited, as that would result in undefined behavior. GCC-style nested functions currently use dynamic creation of executable thunks on most architectures when taking the address of the nested function. On most architectures (including X86), these ...
gcc and clang offer the -mno-red-zone flag to disable red-zone optimizations. If the callee is a variadic function , then the number of floating point arguments passed to the function in vector registers must be provided by the caller in the AL register.