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There are various formats for object files, and the same machine code can be packaged in different object file formats. An object file may also work like a shared library. The metadata that object files may include can be used for linking or debugging; it includes information to resolve symbolic cross-references between different modules ...
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.
Each source compilation generates a separate object file and link-time helper file. When the object files are linked, the compiler is executed again and uses the helper files to optimize code across the separately compiled object files. Plugins Plugins extend the GCC compiler directly. [69]
A program that is configured to use a library can use either static-linking or dynamic-linking.Historically, libraries could only be static. [4] For static-linking (), the library is effectively embedded into the programs executable file, while for dynamic-linking the library can be loaded at runtime from a shared location, such as system files.
The object file has no undefined references. 1<<1: 0000_0000_0000_0000_0000_0000_0000_0010: The object file is the output of an incremental link against a base file and can't be link edited again. 1<<2: 0000_0000_0000_0000_0000_0000_0000_0100: The object file is input for the dynamic linker and can't be statically link edited again. 1<<3
creation of Windows dynamic-link libraries: gold: alternative linker for ELF files nlmconv: object file conversion to a NetWare Loadable Module: nm: list symbols exported by object files objcopy: copy object files, possibly making changes objdump: dump information about object files ranlib: generate indices for archives (for compatibility; same ...
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.
Static linking does naturally lend to the concept of LTO, but it only works with library archives that contain IR objects as opposed to machine-code only object files. [1] Due to performance concerns, not even the entire unit is always directly used—a program could be partitioned in a divide-and-conquer style LTO such as GCC's WHOPR. [ 2 ]