Honey: Generally, no. Even if the object file were in a format designed for execution which it basically never is , that part about "symbols it requires in order to work" basically kills the deal. Even your standard "hello world" requires linking against a C runtime library. An Object file is the compiled file itself. There is no difference between the two. An executable file is formed by linking the Object files. The optimized code isn't being generated at pre-processor stage nor immediately after it.
Pre-processor only deals with its own language and that's it. Optimization happens at compilation and assembly stages. Is the object file we get after compiling same as the executable file in machine language. I'm confused because, you said object file is created at second step from the last and last step is the executable file.
So, the. There are 3 kind of object files. Relocatable object files Contain machine code in a form that can be combined with other relocatable object files at link time, in order to form an executable object file. Shared object files Special type of relocatable object file that can be loaded dynamically, either at load time, or at run time. Executable object files Contain machine code that can be directly loaded into memory by the loader, e.
Bonus read: When linking against a static library the functions that are referenced in the input objects are copied to the final executable. The linking process can be done as follows: ld a.
Community Bot 1 1 1 silver badge. Paschalis Paschalis An object file is just what you get when you compile one or several source file s. It can be either a fully completed executable or library, or intermediate files. Mat Mat k 39 39 gold badges silver badges bronze badges. Robert Houghton 9 9 silver badges 25 25 bronze badges.
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Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science. Windows Server R2. Windows On Windows systems, data D, d and uninitialized data B, b are not currently recognized in executable files, as this involves trying to guess segment types. All such symbols come out as text T, t symbols.
Commands: ar , size , strip. Windows executable files, which normally end in. A symbol table may be created from a. By default, nm lists the symbols in file in alphabetical order by name and provides the following information on each: File or object name if you specified -A Symbol name Symbol type: Note: Not all of these symbol types are available on all systems.
A absolute symbol, global a absolute symbol, local B uninitialized data bss , global b uninitialized data bss , local D initialized data, global d initialized data, local F file name l line number entry see -a option N no defined type, global; this is an unspecified type, compared to the undefined type U n no defined type, local; this is an unspecified type, compared to the undefined type U S section symbol, global s section symbol, local T text symbol, global t text symbol, local static U undefined symbol?
Add a comment. Active Oldest Votes. The standard tool for listing symbols is nm , you can use it simply like this: nm -gD yourLib. Steve Gury Steve Gury This doesn't always work with.
Note that OS X versions of nm are missing the '-C' option for demangling symbols. Example script here: v8. Note that readelf -Ws will show you all symbols, and nm -g shows only the externally visible symbols.
This may be confusing if you are examining multiple symbol files and start interchanging your commands. I would also add objectdump -TC to the list. In contrary to readelf -Ws , it doesn't show the mangled names. BrooksMoses For. Show 5 more comments. Community Bot 1 1 1 silver badge. P Shved P Shved Pavel Lapin Pavel Lapin 5 5 silver badges 4 4 bronze badges.
For shared libraries libNAME. Peter Remmers Peter Remmers 1, 12 12 silver badges 11 11 bronze badges. Thank you! This explains why sometimes "nm" doesn't show any symbols for. No way to see the symbol version though, isn't it? I tried it with glibc. With that, it works.
I get e.
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