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This calling convention is also used by Embarcadero's C++Builder, where it is called __fastcall. [16] In this compiler, Microsoft's fastcall can be used as __msfastcall. [17] GCC and Clang can be made to use a similar calling convention by using __stdcall with the regparm function attribute or the -mregparm=3 switch. (The stack order is inverted.)
Clang becomes default compiler in OpenBSD 6.6 on mips64. [58] 19 September 2019 Clang 9.0.0 released with official RISC-V target support. [59] 29 February 2020 Clang becomes the only C compiler in the FreeBSD base system, with the removal of GCC. [60] 24 March 2020 Clang 10.0.0 released: 2 April 2020: Clang becomes default compiler in OpenBSD 6 ...
Further, along with the #[start] function attribute or the #[no_main] crate attribute, it allows the user to define a C-style entry point for the program. [10] Rust has used many versions of symbol mangling schemes that can be selected at compile time with an -Z symbol-mangling-version option. The following manglers are defined:
Weak symbols can be used as a mechanism to provide default implementations of functions that can be replaced by more specialized (e.g. optimized) ones at link-time. The default implementation is then declared as weak, and, on certain targets, object files with strongly declared symbols are added to the linker command line.
LLVM is a set of compiler and toolchain technologies [5] that can be used to develop a frontend for any programming language and a backend for any instruction set architecture. LLVM is designed around a language-independent intermediate representation (IR) that serves as a portable , high-level assembly language that can be optimized with a ...
An example is the errno used by many functions of the C library. On a modern machine, where multiple threads may be modifying the errno variable, a call of a system function on one thread may overwrite the value previously set by a call of a system function on a different thread, possibly before following code on that different thread could ...
In the C programming language, restrict is a keyword, introduced by the C99 standard, [1] that can be used in pointer declarations. By adding this type qualifier, a programmer hints to the compiler that for the lifetime of the pointer, no other pointer will be used to access the object to which it points. This allows the compiler to make ...
Allowing attributes for namespaces and enumerators [10] [11] New standard attributes [[ fallthrough ]] , [[ maybe_unused ]] and [[ nodiscard ]] [ 12 ] UTF-8 ( u8 ) character literals [ 10 ] [ 13 ] (UTF-8 string literals have existed since C++11 ; C++17 adds the corresponding character literals for consistency, though as they are restricted to a ...