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In practice, Clang is a drop-in replacement for GCC. [25] Clang's developers aim to reduce memory footprint and increase compiling speed compared to other compilers, such as GCC. In October 2007, they report that Clang compiled the Carbon libraries more than twice as fast as GCC, while using about one-sixth GCC's memory and disk space. [26]
musl is a C standard library intended for operating systems based on the Linux kernel, released under the MIT License. [3] It was developed by Rich Felker to write a clean, efficient, and standards-conformant libc implementation.
Ulrich Drepper in 2007, the main author of glibc The GNU C Library is a wrapper around the system calls of the Linux kernel. The Linux kernel and GNU C Library together form the Linux API. After compilation, the binaries offer an ABI.
The nm command identifies weak symbols in object files, libraries, and executables. On Linux a weak function symbol is marked with "W" if a weak default definition is available, and with "w" if it is not.
GCC uses many additional tools in its build, many of which are installed by default by many Unix and Linux distributions (but which, normally, aren't present in Windows installations), including Perl, [further explanation needed] Flex, Bison, and other common tools.
Historically the NDK and the platform diverged, but NDK r11 and later have replaced NDK forks with their current platform equivalents. This work initially focused on the GCC and Clang compilers. Prior to NDK r14, when "unified" headers were first offered on an opt-in basis, the NDK had forked copies of the platform headers for different API levels.
The GNU Binary Utilities, or binutils, is a collection of programming tools maintained by the GNU Project for working with executable code including assembly, linking and many other development operations.
Harvey OS [84] is an effort to get the Plan 9 code working with gcc and clang. JehanneOS [85] is an experimental OS derived from Plan 9. Its userland and modules are mostly derived from 9front, its build system from Harvey OS, and its kernel is a fork of the Plan9-9k 64-bit Plan9 kernel.