GCC compiling a dll with __stdcall

Question

When we compile a dll using __stdcall inside visual studio 2008 the compiled function names inside the dll are.

FunctionName

Though when we compile the same dll using GCC using wx-dev-cpp GCC appends the number of paramers the function has, so the name of the function using Dependency walker looks like.

FunctionName@numberOfParameters or == FunctionName@8

How do you tell GCC compiler to remove @nn from exported symbols in the dll?

Answer 1

__stdcall decorates the function name by adding an underscore to the start, and the number of bytes of parameters to the end (separated by @).

So, a function:

void __stdcall Foo(int a, int b);

...would become _Foo@8.

If you list the function name (undecorated) in the EXPORTS section of your .DEF file, it is exported undecorated.

Perhaps this is the difference?

Answer 2

Just use -Wl,--kill-at on the gcc command line, which will pass --kill-at to the linker.

References:

• http://sourceware.org/binutils/docs/ld/Options.html#Options
• http://www.geocities.com/yongweiwu/stdcall.htm

Answer 3

You can also use -Wl,--add-stdcall-alias to your linker options in GCC. This will ensure that both function names (decorated and undecorated) are present and can be used as alias.