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How to prevent VC++ 9 linker from linking unnecessary global variables?


How to prevent VC++ 9 linker from linking unnecessary global variables?

By : Siddhant Swaroop
Date : October 18 2020, 11:12 AM
To fix this issue The MSDN (see the Arguments section, REF | NOREF arguments, 4th paragraph) specifies that You have to explicitly mark data as a COMDAT; use __declspec(selectany). for the linker to remove said unused data when using /OPT:REF.
Have you tried and had any chance with __declspec(selectany) ?
code :


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Global variables and linker error

Global variables and linker error


By : Siconic
Date : March 29 2020, 07:55 AM
I wish this helpful for you I've written a simple program in C++ using OpenGL. What I need is to have couple global variables in two files - main.cpp and funcs.cpp - which will hold the same values. When I tried to declare these variables in funcs.h (which is included also in main.cpp) I got this error: , Using C++:
code :
namespace
{
    int myVariable;

    // ...
creating global variables causes linker error

creating global variables causes linker error


By : Pedro Máiquez
Date : March 29 2020, 07:55 AM
it helps some times You cannot define variables at namespace level in a header. In general it is best not to have global variables, but if you need to you should provide only a declaration in the header and the definition in a single .cpp:
code :
//header
extern int i;

//cpp
int i;
Linker error with global variables in .h files

Linker error with global variables in .h files


By : mlanga
Date : March 29 2020, 07:55 AM
around this issue If you're using #include "exception.h" in exception.c, graph.c, io.c, and every other C source file in your project, then that's the equivalent of copying the contents of exception.h into the top of every C source file.
That means that in each C source file, there's an _ErrorCode variable defined. When the object files from each C source file are linked, since __ErrorCode is defined in each object file, that's a naming conflict.
How to get the value of global variables imported from linker through gdb?

How to get the value of global variables imported from linker through gdb?


By : Sergey Anisimov
Date : March 29 2020, 07:55 AM
I wish this helpful for you To print the address of a symbol, use the take-address operator (&):
code :
(gdb) print &_ebss
$1 = ...
initiating global variables in different translation units (linker involved)

initiating global variables in different translation units (linker involved)


By : c k ravi
Date : March 29 2020, 07:55 AM
To fix this issue
My question is, why would gcc file2.cpp file1.cpp compile rather than giving undefined reference to y1 error even if the linking sequence is "wrong"?
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