CODEWITHSUNDEEP
c++visual-c++dllcygwinname-mangling
SJ_3
SJ_3

Reputation: 11

Name decoration or name mangling in c++

I have generated dll file using cygwin and I am trying to use it in Visual Studio.

  1. I got the DEF(.def) file with mangled function names as part of cygwin compilation.
  2. Using lib.exe program which comes as part of MSVC, I generated .lib file.

In MSVC, I wrote a program which used the function from the lib file which was created.

I got Linker errors. When I checked the mangled names,the one in DEF file is different to the one in the error thrown in MSVC. I demangled both and found that MSVC has mangled the function name with __cdecl keyword.

How can I create mangled function names in cygwin with __cdecl keyword? Am I missing any flags in cgwin compilation?

Visual Studio:
Mangled name:

(__imp_?configure_tls_context@client@asio_http2@nghttp2@@YA?AVerror_code@system@boost@@AAV456@AAVcontext@ssl@asio@6@@Z)

Demangled name:

(__imp_class boost::system::error_code __cdecl nghttp2::asio_http2::client::configure_tls_context(class boost::system::error_code &,class boost::asio::ssl::context &)

DEF file from Cygwin: Mangled name:

_ZN7nghttp210asio_http26client21configure_tls_contextERN5boost6system10error_codeERNS2_4asio3ssl7contextE

Demangled name:

nghttp2::asio_http2::client::configure_tls_context(boost::system::error_code&, boost::asio::ssl::context&)

Upvotes: 0

Views: 659

Answers (1)

Jesper Juhl
Jesper Juhl

Reputation: 31465

As a general rule; with C++ code you always need to compile all code for your project with the exact same compiler. This includes the executable and all static and dynamic libraries. C++ does not have a ABI specification and all compilers may mangle names differently and even new minor versions of a compiler may produce code that is incompatible with code built with previous versions. There is no standard for name mangling or data structure layout etc.

So; always recompile all source code with the exact same compiler or be prepared for a world of pain.

Upvotes: 3

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