Feature request: ignore "#pragma intrinsic"

[Marián__VooDooMan__M]

Greetings,

I use ICC 13 under MSVC 2012.

MSVC 2012 has construct:"#pragma intrinsic(fabs)" before function to let compiler know it should use intrinsic function "fabs" in this case in following function.

ICC doesn't know this #pragma, obviously it has command-line switches to automatically use intrinsic functions when possible. So I need to use following instead before function:

[cpp] #if defined(_MSC_VER) && !defined(__INTEL_COMPILER) # pragma intrinsic(fabs) #endif [/cpp]

It would be cool if ICC would accept "#pragma intrinsic", and instead of raising compile warning would just ignore this pragma.

[Marián__VooDooMan__M]

Marián "VooDooMan" Meravý wrote:
[cpp] #if defined(_MSC_VER) && !defined(__INTEL_COMPILER) # pragma intrinsic(fabs) #endif [/cpp]

It would be cool if ICC would accept "#pragma intrinsic", and instead of raising compile warning would just ignore this pragma.

Just a side note, ICC raises warning "unknown pragma", and I don't want to globally disable this warning, so I need to use above preprocessor guard.

[SergeyKostrov]

I support Marian's request and I'd like to add that a complete overhaul of different pragmas ( including Intel specific ) is needed because there are Too Many inconsistencies.

[SergeyKostrov]

Here are additional technical details. Last week I completed a test related to using __cdecl, __stdcall and __fastcall calling conventions in the same project (!). It would be nice to have a pragma like, #pragma function ( FunctionName, calling convention ) An example of usage could look like: ... #pragma function ( AfxBeginThread, __stdcall ); ... A real problem happens when some project uses MFC function AfxBeginThread and project settings are set as follows: Project Property Pages -> Configuration Properties -> C/C++ Advanced -> Calling Convention = __fastcall ( /Gr ) Take into account that the AfxBeginThread is declared as follows: [ Afxwin.h ] ... // global helpers for threads CWinThread * AFXAPI AfxBeginThread( AFX_THREADPROC pfnThreadProc, LPVOID pParam, int nPriority = THREAD_PRIORITY_NORMAL, UINT nStackSize = 0, DWORD dwCreateFlags = 0, LPSECURITY_ATTRIBUTES lpSecurityAttrs = NULL ); CWinThread * AFXAPI AfxBeginThread( CRuntimeClass* pThreadClass, int nPriority = THREAD_PRIORITY_NORMAL, UINT nStackSize = 0, DWORD dwCreateFlags = 0, LPSECURITY_ATTRIBUTES lpSecurityAttrs = NULL ); ... [ Afxver_.h ] ... // AFXAPI is used on global public functions #ifndef AFXAPI #define AFXAPI __stdcall #endif ... So, there is a conflict between two calling convention specificators, the one which is declared for the function in the header and another one which is set in project settings.

[SergeyKostrov]

Even if Intel and Microsoft C++ compilers have similar compilation outputs I think some improvements, or extensions, are needed to resolve all these issues related to usage of __cdecl, __stdcall and __fastcall calling conventions in the same project: ... Compiling with Intel(R) C++ Compiler XE 12.1.7.371 [IA-32]... (Intel C++ Environment) IccTestApp.cpp .\../../Common/PrtTests.cpp(28846): error: no instance of overloaded function "AfxBeginThread" matches the argument list argument types are: (RTuint (void *), CMyObject *, int, int, int) pThreadObj[0] = ( CWinThread * )AfxBeginThread( ThreadProc01, pMyObject[0], THREAD_PRIORITY_NORMAL, 1024, CREATE_SUSPENDED ); ^ .\../../Common/PrtTests.cpp(28847): error: no instance of overloaded function "AfxBeginThread" matches the argument list argument types are: (RTuint (void *), CMyObject *, int, int, int) pThreadObj[1] = AfxBeginThread( ThreadProc02, pMyObject[1], THREAD_PRIORITY_NORMAL, 1024, CREATE_SUSPENDED ); ^ .\../../Common/PrtTests.cpp(28848): error: no instance of overloaded function "AfxBeginThread" matches the argument list argument types are: (RTuint (void *), CMyObject *, int, int, int) pThreadObj[2] = AfxBeginThread( ThreadProc03, pMyObject[2], THREAD_PRIORITY_NORMAL, 1024, CREATE_SUSPENDED ); ^ .\../../Common/PrtTests.cpp(37761): error: argument of type "void (*)()" is incompatible with parameter of type "void (__cdecl *)()" CrtAtexit( AppExitFunction1 ); ^ .\../../Common/PrtTests.cpp(37762): error: argument of type "void (*)()" is incompatible with parameter of type "void (__cdecl *)()" CrtAtexit( AppExitFunction2 ); ^ compilation aborted for .\IccTestApp.cpp (code 2) IccTestApp - 5 error(s), 0 warning(s), 0 remark(s) ...

[SergeyKostrov]

Microsoft C++ compiler output: ... Compiling... ScaLibTestApp.cpp c:\workenv\appsworkdev\common\prttests.cpp(28846) : error C2665: 'AfxBeginThread' : none of the 2 overloads could convert all the argument types c:\vs.2005\vc\atlmfc\include\afxwin.h(4202): could be 'CWinThread *AfxBeginThread(AFX_THREADPROC,LPVOID,int,UINT,DWORD,LPSECURITY_ATTRIBUTES)' c:\vs.2005\vc\atlmfc\include\afxwin.h(4205): or 'CWinThread *AfxBeginThread(CRuntimeClass *,int,UINT,DWORD,LPSECURITY_ATTRIBUTES)' while trying to match the argument list '(RTuint (__fastcall *)(void *), CMyObject *, int, int, int)' c:\workenv\appsworkdev\common\prttests.cpp(28847) : error C2665: 'AfxBeginThread' : none of the 2 overloads could convert all the argument types c:\vs.2005\vc\atlmfc\include\afxwin.h(4202): could be 'CWinThread *AfxBeginThread(AFX_THREADPROC,LPVOID,int,UINT,DWORD,LPSECURITY_ATTRIBUTES)' c:\vs.2005\vc\atlmfc\include\afxwin.h(4205): or 'CWinThread *AfxBeginThread(CRuntimeClass *,int,UINT,DWORD,LPSECURITY_ATTRIBUTES)' while trying to match the argument list '(RTuint (__fastcall *)(void *), CMyObject *, int, int, int)' c:\workenv\appsworkdev\common\prttests.cpp(28848) : error C2665: 'AfxBeginThread' : none of the 2 overloads could convert all the argument types c:\vs.2005\vc\atlmfc\include\afxwin.h(4202): could be 'CWinThread *AfxBeginThread(AFX_THREADPROC,LPVOID,int,UINT,DWORD,LPSECURITY_ATTRIBUTES)' c:\vs.2005\vc\atlmfc\include\afxwin.h(4205): or 'CWinThread *AfxBeginThread(CRuntimeClass *,int,UINT,DWORD,LPSECURITY_ATTRIBUTES)' while trying to match the argument list '(RTuint (__fastcall *)(void *), CMyObject *, int, int, int)' c:\workenv\appsworkdev\common\prttests.cpp(37761) : error C2664: 'atexit' : cannot convert parameter 1 from 'void (__fastcall *)(void)' to 'void (__cdecl *)(void)' None of the functions with this name in scope match the target type c:\workenv\appsworkdev\common\prttests.cpp(37762) : error C2664: 'atexit' : cannot convert parameter 1 from 'void (__fastcall *)(void)' to 'void (__cdecl *)(void)' None of the functions with this name in scope match the target type c:\workenv\appsworkdev\appssca\scalibtestapp\scalibtestapp.cpp(26) : warning C4007: 'wmain' : must be '__cdecl' ScaLibTestApp - 5 error(s), 1 warning(s) ...

[SergeyKostrov]

In overall, three test cases need to be considered: #pragma function ( AfxBeginThread, __stdcall ); #pragma function ( atexit, __cdecl ); #pragma function ( wmain, __cdecl ); Thanks in advance.

[Marián__VooDooMan__M]

@Intel

is this a DPD200042138 FR? or another, and which one?

TIA!