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A linker or link editor is a computer program that combines intermediate software build files such as object and library files into a single executable file such a program or library. A linker is often part of a toolchain that includes a compiler and/or assembler that generates intermediate files that the linker processes.
For example, a binary is dynamically linked against libraries libfoo.so and libbar.so. libfoo defines symbol f and declares it as weak. libbar also defines f and declares it as strong. Depending on the library ordering on the link command line (i.e. -lfoo -lbar ) the dynamic linker uses the weak f from libfoo.so although a strong version is ...
Other information, such as command-line options (flags), is more useful to build tools such as a compiler and a linker. The tool was originally designed for Linux, and is now also available for BSD, Windows, macOS, and Solaris. The first implementation was written in shell script. [1] Later, it was rewritten in C leveraging GLib. [2]
Examples of this are the x86 calling conventions. Adhering to an ABI (which may or may not be officially standardized) is usually the job of a compiler, operating system, or library author. However, an application programmer may have to deal with an ABI directly when writing a program in a mix of programming languages, or even compiling a ...
.text.globl _start _start: # _start is the entry point known to the linker xor %ebp, %ebp # effectively RBP := 0, mark the end of stack frames mov (%rsp), %edi # get argc from the stack (implicitly zero-extended to 64-bit) lea 8 (%rsp), %rsi # take the address of argv from the stack lea 16 (%rsp, %rdi, 8), %rdx # take the address of envp from ...
An ELF file has two views: the program header shows the segments used at run time, whereas the section header lists the set of sections.. In computing, the Executable and Linkable Format [2] (ELF, formerly named Extensible Linking Format) is a common standard file format for executable files, object code, shared libraries, and core dumps.
This shows the typical layout of a simple computer's program memory with the text, various data, and stack and heap sections. Historically, BSS (from Block Started by Symbol) is a pseudo-operation in UA-SAP (United Aircraft Symbolic Assembly Program), the assembler developed in the mid-1950s for the IBM 704 by Roy Nutt, Walter Ramshaw, and others at United Aircraft Corporation.
GCC is a key component of the GNU toolchain which is used for most projects related to GNU and the Linux kernel. With roughly 15 million lines of code in 2019, GCC is one of the largest free programs in existence. [4] It has played an important role in the growth of free software, as both a tool and an example.