- #CONSTRUCT 3 GLOBAL VARIABLES HOW TO#
- #CONSTRUCT 3 GLOBAL VARIABLES ARCHIVE#
- #CONSTRUCT 3 GLOBAL VARIABLES CODE#
Once an object file is selected, all of its symbols & references are added to the current state and the process continues. it is how some of operator new/delete form overloads replacement works).
#CONSTRUCT 3 GLOBAL VARIABLES CODE#
That's why you can override some library functions in your own code (e.g. The linker initially starts with all object files given on the command line and then recursively selects object files from the static libraries until all symbol references are satifisied (or an error occurs).
#CONSTRUCT 3 GLOBAL VARIABLES ARCHIVE#
Basically, archive have a global archive table which maps symbols with global/weak binding to a particular object file member. The way object file selection from archives works is a bit different. The linker determines whether a particular COMDAT section is required based on symbol references (these are almost always relocations, even though COMDAT section grouping features exist in similar ways in both MS/COFF & ELF). inline functions, vtables of polymorphic classes without a decider function). The obvious uses are things with external linkage that do not violate the ODR (e.g. COMDAT sections allow for duplicating input sections in several contributing object files where only one is selected. Standard (non-COMDAT) input sections are merged when the corresponding object file is selected. In my definition and the one of at least four major toolchain implementators, it is not.Īgain unreferenced COMDAT elimination operates on sections - specifically on sections from object files (often called input sections in the ELF world and sometimes called section contributions in the MS/COFF world), many input sections of the same name contribute to a single output section. Your first argument (BTW: how do you do these quotes, I'm apparently too dumb to use the web interface) only holds if the corresponding translation unit is part of the program. For instance, the debugger can't materialize a breakpoint on a given code line if the containing translation unit was not built with debug information enabled. Of course, you should really be certain that the initializers are not called. The /VERBOSE linker switch will reveal why a particular object file is selected from a library or not. If the containing object file is selected the input section from that object file will contribute to the corresponding output section (It's not a COMDAT section). The CRT initialization invokes the initializers before entering the user supplied main function. Rather, the compiler injects pointers to generated initialization functions for objects with nontrivial constructors or destructors or those requiring dynamic initialization. These pointers are emitted into a special section - typically. While, an implementation may defer construction VC does not. The unreferenced COMDAT elimination phase runs logically after that (even though a smarter linker will probably construct the dependency graph earlier).
Object files are selected from an archive, if and only if they are required to satisfy a strong symbol reference (via the archive symbol table). The pig will thank you.AFAICT, that's not a bug but it is the way all significant linkers work and have ever worked. Remember: be nice, don't spam and be a generally awesome human. We encourage a friendly and helpful community!
#CONSTRUCT 3 GLOBAL VARIABLES HOW TO#
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