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Altera_Forum's avatar
Altera_Forum
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10 years ago

Visual studio 14.0 LNK2001 (unresolved external symbol ) with OpenCL

I am new to OpenCL. When I tried the examples from the website of Altera, I got LNK2001 errors as follows 

Error   LNK1120 1 unresolved externals  hello_world C:\Users\S_KW\OpenCL\hello_world\bin\hello_world.exe    1

Error   LNK2001 unresolved external symbol __imp_sprintf    hello_world  C:\Users\S_KW\OpenCL\hello_world\OpenCL.lib(icd_windows.obj)    1

Warning LNK4044 unrecognized option  '/LC:\Users\S_KW\arrow_c5sockit_bsp\arm32\lib'; ignored hello_world  C:\Users\S_KW\OpenCL\hello_world\LINK   1

Warning LNK4044 unrecognized option '/lalterahalmmd'; ignored   hello_world C:\Users\S_KW\OpenCL\hello_world\LINK   1

Warning LNK4044 unrecognized option '/lalterammdpcie'; ignored  hello_world C:\Users\S_KW\OpenCL\hello_world\LINK   1

I have already added path of the libs and head files. It seems that the OpenCL.lib cannot see the printf function. But I think the printf is built in C++. It is confusing. Someone know how to handle this? Thank you very much!!!

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    8 years ago

    I have had success compiling the vector_add test code with Visual Studio v14.0 (aka 2015)

    1) change Project vector_add properties Additional Depenancies "OpenCL.lib;legacy_stdio_definitions.lib;%(AdditionalDependencies)"

    2) change the main.cpp program, at top of file after includes

    FILE _iob[] = { *stdin, *stdout, *stderr };

    extern "C" FILE * __cdecl __iob_func(void) { return _iob; }

    extern "C" void __imp__set_output_format(void) {};

    This may break other things, but the vector_add test works with these changes. (refs https://stackoverflow.com/questions/31242820 , https://stackoverflow.com/questions/30412951 )