Does Visual C++ provide a language construct with the same functionality as `__attribute_

__attribute__((alias)) means:

alias ("target")

The alias attribute causes the declaration to be emitted as an alias for another symbol, which must be specified. For instance,
  void __f () { /* Do something. */; }

  void f () __attribute__ ((weak, alias ("__f")));
defines f to be a weak alias for __f. In C++, the mangled name for the target must be used. It is an error if __f is not defined in the same translation unit.

Not all target machines support this attribute.

edited Nov 19 '18 at 19:44

Peter Ruderman

10.1k2352

asked Nov 19 '18 at 19:34

Lehks

578

2

Possible duplicate of Does Windows have a __declspec equivalent to Unix GCC's __attribute__((weak))?
– RbMm
Nov 19 '18 at 19:51

1

#pragma comment(linker, "/alternatename:f=__f") must be (where in place f and __f must be exactly mangled names)
– RbMm
Nov 19 '18 at 19:53

@RbMm: That doesn't look lkke a duplicate.
– R..
Nov 20 '18 at 2:28

@R.. - may be i mistake. however this - stackoverflow.com/a/12397639/6401656 is answer for current question
– RbMm
Nov 20 '18 at 7:19

@RbMm: "same solution works" doesn't imply question is duplicate.
– R..
Nov 20 '18 at 12:30

add a comment |

__attribute__((alias)) means:

alias ("target")

The alias attribute causes the declaration to be emitted as an alias for another symbol, which must be specified. For instance,
  void __f () { /* Do something. */; }

  void f () __attribute__ ((weak, alias ("__f")));
defines f to be a weak alias for __f. In C++, the mangled name for the target must be used. It is an error if __f is not defined in the same translation unit.

Not all target machines support this attribute.

edited Nov 19 '18 at 19:44

Peter Ruderman

10.1k2352

asked Nov 19 '18 at 19:34

Lehks

578

2

Possible duplicate of Does Windows have a __declspec equivalent to Unix GCC's __attribute__((weak))?
– RbMm
Nov 19 '18 at 19:51

1

#pragma comment(linker, "/alternatename:f=__f") must be (where in place f and __f must be exactly mangled names)
– RbMm
Nov 19 '18 at 19:53

@RbMm: That doesn't look lkke a duplicate.
– R..
Nov 20 '18 at 2:28

@R.. - may be i mistake. however this - stackoverflow.com/a/12397639/6401656 is answer for current question
– RbMm
Nov 20 '18 at 7:19

@RbMm: "same solution works" doesn't imply question is duplicate.
– R..
Nov 20 '18 at 12:30

add a comment |

__attribute__((alias)) means:

alias ("target")

The alias attribute causes the declaration to be emitted as an alias for another symbol, which must be specified. For instance,
  void __f () { /* Do something. */; }

  void f () __attribute__ ((weak, alias ("__f")));
defines f to be a weak alias for __f. In C++, the mangled name for the target must be used. It is an error if __f is not defined in the same translation unit.

Not all target machines support this attribute.

edited Nov 19 '18 at 19:44

Peter Ruderman

10.1k2352

asked Nov 19 '18 at 19:34

Lehks

578

__attribute__((alias)) means:

alias ("target")

The alias attribute causes the declaration to be emitted as an alias for another symbol, which must be specified. For instance,
  void __f () { /* Do something. */; }

  void f () __attribute__ ((weak, alias ("__f")));
defines f to be a weak alias for __f. In C++, the mangled name for the target must be used. It is an error if __f is not defined in the same translation unit.

Not all target machines support this attribute.

c++ c gcc visual-c++

edited Nov 19 '18 at 19:44

Peter Ruderman

10.1k2352

asked Nov 19 '18 at 19:34

Lehks

578

edited Nov 19 '18 at 19:44

Peter Ruderman

10.1k2352

asked Nov 19 '18 at 19:34

Lehks

578

edited Nov 19 '18 at 19:44

Peter Ruderman

10.1k2352

edited Nov 19 '18 at 19:44

Peter Ruderman

10.1k2352

edited Nov 19 '18 at 19:44

Peter Ruderman

10.1k2352

asked Nov 19 '18 at 19:34

Lehks

578

asked Nov 19 '18 at 19:34

Lehks

578

asked Nov 19 '18 at 19:34

Lehks

578

2

Possible duplicate of Does Windows have a __declspec equivalent to Unix GCC's __attribute__((weak))?
– RbMm
Nov 19 '18 at 19:51

1

#pragma comment(linker, "/alternatename:f=__f") must be (where in place f and __f must be exactly mangled names)
– RbMm
Nov 19 '18 at 19:53

@RbMm: That doesn't look lkke a duplicate.
– R..
Nov 20 '18 at 2:28

@R.. - may be i mistake. however this - stackoverflow.com/a/12397639/6401656 is answer for current question
– RbMm
Nov 20 '18 at 7:19

@RbMm: "same solution works" doesn't imply question is duplicate.
– R..
Nov 20 '18 at 12:30

add a comment |

2

Possible duplicate of Does Windows have a __declspec equivalent to Unix GCC's __attribute__((weak))?
– RbMm
Nov 19 '18 at 19:51

1

#pragma comment(linker, "/alternatename:f=__f") must be (where in place f and __f must be exactly mangled names)
– RbMm
Nov 19 '18 at 19:53

@RbMm: That doesn't look lkke a duplicate.
– R..
Nov 20 '18 at 2:28

@R.. - may be i mistake. however this - stackoverflow.com/a/12397639/6401656 is answer for current question
– RbMm
Nov 20 '18 at 7:19

@RbMm: "same solution works" doesn't imply question is duplicate.
– R..
Nov 20 '18 at 12:30

Possible duplicate of Does Windows have a __declspec equivalent to Unix GCC's __attribute__((weak))?
– RbMm
Nov 19 '18 at 19:51

#pragma comment(linker, "/alternatename:f=__f") must be (where in place f and __f must be exactly mangled names)
– RbMm
Nov 19 '18 at 19:53

@RbMm: That doesn't look lkke a duplicate.
– R..
Nov 20 '18 at 2:28

@R.. - may be i mistake. however this - stackoverflow.com/a/12397639/6401656 is answer for current question
– RbMm
Nov 20 '18 at 7:19

@RbMm: "same solution works" doesn't imply question is duplicate.
– R..
Nov 20 '18 at 12:30

add a comment |

1 Answer
1

active

oldest

votes

You can do something like this for C. This is supported for x86 and x64 for msvc v19.15.

#include <stdio.h>



void __f() { puts("This function is aliased"); }



void f();



#pragma comment(linker, "/alternatename:f=__f")



int main()

{

    f();

}

See the compiled demo here.

I have tested this in Visual Studio 2017 with /TC option.

edited Nov 21 '18 at 7:04

answered Nov 20 '18 at 7:44

P.W

11.7k3842

compile nothing prove here. need link, because f if not found redirected to __f at link time. also #pragma comment(linker, "/alternatename:f=__f") only for x64 and c code. for c++ code symbols will be mangled ?f@@YAXXZ=?__f@@YAXXZ must be. for c and x86 also will be mangle depend from calin convention. say _f=___f for __cdecl or _f@0=___f@0 for __stdcall and @f@0=@__f@0 for __fastcall
– RbMm
Nov 20 '18 at 13:06

I tested it on my PC. But I obviously could not link it here. rextester has an older version of VC++ compiler.
– P.W
Nov 20 '18 at 13:07

your current code will be ok only if you compile as c code and target platform x64 otherwise you got unresolved external symbol
– RbMm
Nov 20 '18 at 13:10

add a comment |

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You can do something like this for C. This is supported for x86 and x64 for msvc v19.15.

#include <stdio.h>



void __f() { puts("This function is aliased"); }



void f();



#pragma comment(linker, "/alternatename:f=__f")



int main()

{

    f();

}

See the compiled demo here.

I have tested this in Visual Studio 2017 with /TC option.

edited Nov 21 '18 at 7:04

answered Nov 20 '18 at 7:44

P.W

11.7k3842

compile nothing prove here. need link, because f if not found redirected to __f at link time. also #pragma comment(linker, "/alternatename:f=__f") only for x64 and c code. for c++ code symbols will be mangled ?f@@YAXXZ=?__f@@YAXXZ must be. for c and x86 also will be mangle depend from calin convention. say _f=___f for __cdecl or _f@0=___f@0 for __stdcall and @f@0=@__f@0 for __fastcall
– RbMm
Nov 20 '18 at 13:06

I tested it on my PC. But I obviously could not link it here. rextester has an older version of VC++ compiler.
– P.W
Nov 20 '18 at 13:07

your current code will be ok only if you compile as c code and target platform x64 otherwise you got unresolved external symbol
– RbMm
Nov 20 '18 at 13:10

add a comment |

You can do something like this for C. This is supported for x86 and x64 for msvc v19.15.

#include <stdio.h>



void __f() { puts("This function is aliased"); }



void f();



#pragma comment(linker, "/alternatename:f=__f")



int main()

{

    f();

}

See the compiled demo here.

I have tested this in Visual Studio 2017 with /TC option.

edited Nov 21 '18 at 7:04

answered Nov 20 '18 at 7:44

P.W

11.7k3842

compile nothing prove here. need link, because f if not found redirected to __f at link time. also #pragma comment(linker, "/alternatename:f=__f") only for x64 and c code. for c++ code symbols will be mangled ?f@@YAXXZ=?__f@@YAXXZ must be. for c and x86 also will be mangle depend from calin convention. say _f=___f for __cdecl or _f@0=___f@0 for __stdcall and @f@0=@__f@0 for __fastcall
– RbMm
Nov 20 '18 at 13:06

I tested it on my PC. But I obviously could not link it here. rextester has an older version of VC++ compiler.
– P.W
Nov 20 '18 at 13:07

your current code will be ok only if you compile as c code and target platform x64 otherwise you got unresolved external symbol
– RbMm
Nov 20 '18 at 13:10

add a comment |

You can do something like this for C. This is supported for x86 and x64 for msvc v19.15.

#include <stdio.h>



void __f() { puts("This function is aliased"); }



void f();



#pragma comment(linker, "/alternatename:f=__f")



int main()

{

    f();

}

See the compiled demo here.

I have tested this in Visual Studio 2017 with /TC option.

edited Nov 21 '18 at 7:04

answered Nov 20 '18 at 7:44

P.W

11.7k3842

You can do something like this for C. This is supported for x86 and x64 for msvc v19.15.

#include <stdio.h>



void __f() { puts("This function is aliased"); }



void f();



#pragma comment(linker, "/alternatename:f=__f")



int main()

{

    f();

}

See the compiled demo here.

I have tested this in Visual Studio 2017 with /TC option.

edited Nov 21 '18 at 7:04

answered Nov 20 '18 at 7:44

P.W

11.7k3842

edited Nov 21 '18 at 7:04

answered Nov 20 '18 at 7:44

P.W

11.7k3842

answered Nov 20 '18 at 7:44

P.W

11.7k3842

answered Nov 20 '18 at 7:44

P.W

11.7k3842

compile nothing prove here. need link, because f if not found redirected to __f at link time. also #pragma comment(linker, "/alternatename:f=__f") only for x64 and c code. for c++ code symbols will be mangled ?f@@YAXXZ=?__f@@YAXXZ must be. for c and x86 also will be mangle depend from calin convention. say _f=___f for __cdecl or _f@0=___f@0 for __stdcall and @f@0=@__f@0 for __fastcall
– RbMm
Nov 20 '18 at 13:06

I tested it on my PC. But I obviously could not link it here. rextester has an older version of VC++ compiler.
– P.W
Nov 20 '18 at 13:07

your current code will be ok only if you compile as c code and target platform x64 otherwise you got unresolved external symbol
– RbMm
Nov 20 '18 at 13:10

add a comment |

compile nothing prove here. need link, because f if not found redirected to __f at link time. also #pragma comment(linker, "/alternatename:f=__f") only for x64 and c code. for c++ code symbols will be mangled ?f@@YAXXZ=?__f@@YAXXZ must be. for c and x86 also will be mangle depend from calin convention. say _f=___f for __cdecl or _f@0=___f@0 for __stdcall and @f@0=@__f@0 for __fastcall
– RbMm
Nov 20 '18 at 13:06

I tested it on my PC. But I obviously could not link it here. rextester has an older version of VC++ compiler.
– P.W
Nov 20 '18 at 13:07

your current code will be ok only if you compile as c code and target platform x64 otherwise you got unresolved external symbol
– RbMm
Nov 20 '18 at 13:10

compile nothing prove here. need link, because f if not found redirected to __f at link time. also #pragma comment(linker, "/alternatename:f=__f") only for x64 and c code. for c++ code symbols will be mangled ?f@@YAXXZ=?__f@@YAXXZ must be. for c and x86 also will be mangle depend from calin convention. say _f=___f for __cdecl or _f@0=___f@0 for __stdcall and @f@0=@__f@0 for __fastcall
– RbMm
Nov 20 '18 at 13:06

I tested it on my PC. But I obviously could not link it here. rextester has an older version of VC++ compiler.
– P.W
Nov 20 '18 at 13:07

your current code will be ok only if you compile as c code and target platform x64 otherwise you got unresolved external symbol
– RbMm
Nov 20 '18 at 13:10

add a comment |

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