Cannot link against a MSVC built Vc because it needs Vc_CDECL on some symbols

[amyspark]

Vc version / revision	Operating System	Compiler & Version	Compiler Flags	Assembler & Version	CPU
1.4.2	Windows	MSVC 19.29.30038.1	/MD /O1 /Ob1 /DNDEBUG /fp:fast	N/A	Ryzen 7 2700x

Testcase

#include <Vc/Vc>
#include <Vc/support.h>
#include <iostream>

int main() {
  if (Vc::isImplementationSupported(Vc::AVX2Impl)) {
    std::cout << "AVX2" << std::endl;
  } else if (Vc::isImplementationSupported(Vc::AVXImpl)) {
    std::cout << "AVX" << std::endl;
  } else if (Vc::isImplementationSupported(Vc::SSE41Impl)) {
    std::cout << "SSE 4.1" << std::endl;
  } else if (Vc::isImplementationSupported(Vc::SSSE3Impl)) {
    std::cout << "SSSE3" << std::endl;
  } else if (Vc::isImplementationSupported(Vc::SSE2Impl)) {
    std::cout << "SSE2" << std::endl;
  } else {
    std::cout << "Scalar" << std::endl;
  }

  Vc::float_v a;
  a[0] = rand();
  a[1] = rand();
  a[2] = rand();
  a[3] = rand();
  std::cout << a << std::endl;
  std::cout << a.sorted() << std::endl;
}

cmake_minimum_required(VERSION 3.10)

project (test)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Vc 1.3.0 REQUIRED)

add_executable(main main.cpp)

target_compile_options(main PRIVATE "/fp:fast")

target_link_libraries(main PUBLIC Vc::Vc)

Actual Results

CMake finds and instantiates Vc::Vc, compilation succeeds, but linking fails:

[cmake] Not searching for unused variables given on the command line.
[cmake] -- Selecting Windows SDK version 10.0.19041.0 to target Windows 10.0.19042.
[cmake] msvc_version.c
[cmake] c1: fatal error C1083: No se puede abrir el archivo origen: 'E:/VcDevel/install/lib/cmake/Vc/msvc_version.c': No such file or directory
[cmake] -- Detected Compiler: MSVC 
[cmake] -- Detected CPU: zen
[cmake] -- Configuring done
[cmake] -- Generating done
[cmake] -- Build files have been written to: E:/VcDevelTest/build
[main] Building folder: VcDevelTest 
[build] Starting build
[proc] Executing command: "C:\Program Files\CMake\bin\cmake.EXE" --build e:/VcDevelTest/build --config MinSizeRel --target ALL_BUILD -j 2 --
[build] Microsoft (R) Build Engine versión 16.10.2+857e5a733 para .NET Framework
[build] Copyright (C) Microsoft Corporation. Todos los derechos reservados.
[build] 
[build]   main.cpp
[build] E:\VcDevel\install\include\Vc\sse\detail.h(679,15): warning C4244: 'return': conversión de 'short' a 'Vc_1::schar'; posible pérdida de datos [E:\VcDevelTest\build\main.vcxproj]
[build] E:\VcDevel\install\include\Vc\avx\detail.h(737,48): warning C4146: operador unario menos aplicado a un tipo unsigned; el resultado aún no tiene signo [E:\VcDevelTest\build\main.vcxproj]
[build] E:\VcDevel\install\include\Vc\avx\detail.h(738,48): warning C4146: operador unario menos aplicado a un tipo unsigned; el resultado aún no tiene signo [E:\VcDevelTest\build\main.vcxproj]
[build] E:\VcDevel\install\include\Vc\avx/vector.h(324,53): warning C4244: '=': conversión de 'U' a 'float'; posible pérdida de datos [E:\VcDevelTest\build\main.vcxproj]
[build]           with
[build]           [
[build]               U=int
[build]           ]
[build] E:\VcDevel\install\include\Vc\avx/vector.h(323): message : al compilar la función del miembro clase plantilla "void Vc_1::Vector<float,Vc_1::VectorAbi::Avx>::set<ValueType>(Vc_1::Vector<float,Vc_1::VectorAbi::Avx> &,int,U &&) noexcept(<expr>)" [E:\VcDevelTest\build\main.vcxproj]
[build]           with
[build]           [
[build]               ValueType=int,
[build]               U=int
[build]           ]
[build] E:\VcDevel\install\include\Vc\common\elementreference.h(79): message : al compilar la función del miembro clase plantilla "Vc_1::Detail::ElementReference<Vc_1::Vector<float,Vc_1::VectorAbi::Avx>,U> &Vc_1::Detail::ElementReference<U,U>::operator =<int>(T &&) noexcept(<expr>) &&" [E:\VcDevelTest\build\main.vcxproj]
[build]           with
[build]           [
[build]               U=Vc_1::Vector<float,Vc_1::VectorAbi::Avx>,
[build]               T=int
[build]           ]
[build] E:\VcDevel\install\include\Vc\avx/vector.h(326,31): warning C4244: 'argumento': conversión de 'U' a 'float'; posible pérdida de datos [E:\VcDevelTest\build\main.vcxproj]
[build]           with
[build]           [
[build]               U=int
[build]           ]
[build] E:\VcDevel\install\include\Vc\common\elementreference.h(82): message : Vea la referencia a la creación de una instancia de la función plantilla "void Vc_1::Vector<float,Vc_1::VectorAbi::Avx>::set<ValueType>(Vc_1::Vector<float,Vc_1::VectorAbi::Avx> &,int,U &&) noexcept" que se está compilando [E:\VcDevelTest\build\main.vcxproj]
[build]           with
[build]           [
[build]               ValueType=int,
[build]               U=int
[build]           ]
[build] E:\VcDevel\install\include\Vc\common\elementreference.h(82): message : Vea la referencia a la creación de una instancia de la función plantilla "void Vc_1::Vector<float,Vc_1::VectorAbi::Avx>::set<ValueType>(Vc_1::Vector<float,Vc_1::VectorAbi::Avx> &,int,U &&) noexcept" que se está compilando [E:\VcDevelTest\build\main.vcxproj]
[build]           with
[build]           [
[build]               ValueType=int,
[build]               U=int
[build]           ]
[build] E:\VcDevelTest\src\main.cpp(23): message : Vea la referencia a la creación de una instancia de la función plantilla "Vc_1::Detail::ElementReference<Vc_1::Vector<float,Vc_1::VectorAbi::Avx>,U> &Vc_1::Detail::ElementReference<U,U>::operator =<int>(T &&) noexcept &&" que se está compilando [E:\VcDevelTest\build\main.vcxproj]
[build]           with
[build]           [
[build]               U=Vc_1::Vector<float,Vc_1::VectorAbi::Avx>,
[build]               T=int
[build]           ]
[build] E:\VcDevelTest\src\main.cpp(23): message : Vea la referencia a la creación de una instancia de la función plantilla "Vc_1::Detail::ElementReference<Vc_1::Vector<float,Vc_1::VectorAbi::Avx>,U> &Vc_1::Detail::ElementReference<U,U>::operator =<int>(T &&) noexcept &&" que se está compilando [E:\VcDevelTest\build\main.vcxproj]
[build]           with
[build]           [
[build]               U=Vc_1::Vector<float,Vc_1::VectorAbi::Avx>,
[build]               T=int
[build]           ]
[build] main.obj : error LNK2019: símbolo externo "public: static void __cdecl Vc_1::CpuId::init(void)" (?init@CpuId@Vc_1@@SAXXZ) sin resolver al que se hace referencia en la función "void __cdecl `dynamic initializer for 'public: static struct Vc_1::detail::RunCpuIdInit<0> Vc_1::detail::RunCpuIdInit<0>::tmp''(void)" (??__E?tmp@?$RunCpuIdInit@$0A@@detail@Vc_1@@2U123@A@@YAXXZ) [E:\VcDevelTest\build\main.vcxproj]
[build] main.obj : error LNK2019: símbolo externo "bool __cdecl Vc_1::isImplementationSupported(enum Vc_1::Implementation)" (?isImplementationSupported@Vc_1@@YA_NW4Implementation@1@@Z) sin resolver al que se hace referencia en la función main [E:\VcDevelTest\build\main.vcxproj]
[build] main.obj : error LNK2019: símbolo externo "class Vc_1::Vector<float,struct Vc_1::VectorAbi::Avx> __cdecl Vc_1::Detail::sorted<7,float,struct Vc_1::enable_if_default_type>(class Vc_1::Vector<float,struct Vc_1::VectorAbi::Avx>)" (??$sorted@$06MUenable_if_default_type@Vc_1@@@Detail@Vc_1@@YA?AV?$Vector@MUAvx@VectorAbi@Vc_1@@@1@V21@@Z) sin resolver al que se hace referencia en la función main [E:\VcDevelTest\build\main.vcxproj]
[build] E:\VcDevelTest\build\MinSizeRel\main.exe : fatal error LNK1120: 3 externos sin resolver [E:\VcDevelTest\build\main.vcxproj]
[build] Build finished with exit code 1

Expected Results

Compilation and linking successful with no errors.

[amyspark]

I ran DUMPLIB on Vc.lib, since I couldn't notice why it was complaining on those symbols:

Open for log

E:/VcDevel 
❯ grep 'sorted<7' install/test.txt 
023 00000000 SECT5  notype ()    External     | ??$sorted@$06FUenable_if_default_type@Vc_1@@@Detail@Vc_1@@YQ?AV?$Vector@FUAvx@VectorAbi@Vc_1@@@1@V21@@Z (class Vc_1::Vector<short,struct Vc_1::VectorAbi::Avx> __vectorcall Vc_1::Detail::sorted<7,short,struct Vc_1::enable_if_default_type>(class Vc_1::Vector<short,struct Vc_1::VectorAbi::Avx>))
025 00000000 SECT7  notype ()    External     | ??$sorted@$06GUenable_if_default_type@Vc_1@@@Detail@Vc_1@@YQ?AV?$Vector@GUAvx@VectorAbi@Vc_1@@@1@V21@@Z (class Vc_1::Vector<unsigned short,struct Vc_1::VectorAbi::Avx> __vectorcall Vc_1::Detail::sorted<7,unsigned short,struct Vc_1::enable_if_default_type>(class Vc_1::Vector<unsigned short,struct Vc_1::VectorAbi::Avx>))
026 00000000 SECT9  notype ()    External     | ??$sorted@$06HUenable_if_default_type@Vc_1@@@Detail@Vc_1@@YQ?AV?$Vector@HUAvx@VectorAbi@Vc_1@@@1@V21@@Z (class Vc_1::Vector<int,struct Vc_1::VectorAbi::Avx> __vectorcall Vc_1::Detail::sorted<7,int,struct Vc_1::enable_if_default_type>(class Vc_1::Vector<int,struct Vc_1::VectorAbi::Avx>))
027 00000000 SECTB  notype ()    External     | ??$sorted@$06IUenable_if_default_type@Vc_1@@@Detail@Vc_1@@YQ?AV?$Vector@IUAvx@VectorAbi@Vc_1@@@1@V21@@Z (class Vc_1::Vector<unsigned int,struct Vc_1::VectorAbi::Avx> __vectorcall Vc_1::Detail::sorted<7,unsigned int,struct Vc_1::enable_if_default_type>(class Vc_1::Vector<unsigned int,struct Vc_1::VectorAbi::Avx>))
028 00000000 SECTD  notype ()    External     | ??$sorted@$06MUenable_if_default_type@Vc_1@@@Detail@Vc_1@@YQ?AV?$Vector@MUAvx@VectorAbi@Vc_1@@@1@V21@@Z (class Vc_1::Vector<float,struct Vc_1::VectorAbi::Avx> __vectorcall Vc_1::Detail::sorted<7,float,struct Vc_1::enable_if_default_type>(class Vc_1::Vector<float,struct Vc_1::VectorAbi::Avx>))
029 00000000 SECTF  notype ()    External     | ??$sorted@$06NUenable_if_default_type@Vc_1@@@Detail@Vc_1@@YQ?AV?$Vector@NUAvx@VectorAbi@Vc_1@@@1@V21@@Z (class Vc_1::Vector<double,struct Vc_1::VectorAbi::Avx> __vectorcall Vc_1::Detail::sorted<7,double,struct Vc_1::enable_if_default_type>(class Vc_1::Vector<double,struct Vc_1::VectorAbi::Avx>))
01B 00000000 SECT3  notype ()    External     | ??$sorted@$06F@Detail@Vc_1@@YQ?AV?$Vector@FUSse@VectorAbi@Vc_1@@@1@V21@@Z (class Vc_1::Vector<short,struct Vc_1::VectorAbi::Sse> 
__vectorcall Vc_1::Detail::sorted<7,short>(class Vc_1::Vector<short,struct Vc_1::VectorAbi::Sse>))
01C 00000000 SECT5  notype ()    External     | ??$sorted@$06G@Detail@Vc_1@@YQ?AV?$Vector@GUSse@VectorAbi@Vc_1@@@1@V21@@Z (class Vc_1::Vector<unsigned short,struct Vc_1::VectorAbi::Sse> __vectorcall Vc_1::Detail::sorted<7,unsigned short>(class Vc_1::Vector<unsigned short,struct Vc_1::VectorAbi::Sse>))
01D 00000000 SECT7  notype ()    External     | ??$sorted@$06H@Detail@Vc_1@@YQ?AV?$Vector@HUSse@VectorAbi@Vc_1@@@1@V21@@Z (class Vc_1::Vector<int,struct Vc_1::VectorAbi::Sse> __vectorcall Vc_1::Detail::sorted<7,int>(class Vc_1::Vector<int,struct Vc_1::VectorAbi::Sse>))
01E 00000000 SECT9  notype ()    External     | ??$sorted@$06I@Detail@Vc_1@@YQ?AV?$Vector@IUSse@VectorAbi@Vc_1@@@1@V21@@Z (class Vc_1::Vector<unsigned int,struct Vc_1::VectorAbi::Sse> __vectorcall Vc_1::Detail::sorted<7,unsigned int>(class Vc_1::Vector<unsigned int,struct Vc_1::VectorAbi::Sse>))
01F 00000000 SECTB  notype ()    External     | ??$sorted@$06M@Detail@Vc_1@@YQ?AV?$Vector@MUSse@VectorAbi@Vc_1@@@1@V21@@Z (class Vc_1::Vector<float,struct Vc_1::VectorAbi::Sse> 
__vectorcall Vc_1::Detail::sorted<7,float>(class Vc_1::Vector<float,struct Vc_1::VectorAbi::Sse>))

E:/VcDevel 
❯ grep 'CpuId::init' install/test.txt
013 00000000 UNDEF  notype ()    External     | ?init@CpuId@Vc_1@@SQXXZ (public: static void __vectorcall Vc_1::CpuId::init(void))
031 00000000 SECT7  notype ()    External     | ?init@CpuId@Vc_1@@SQXXZ (public: static void __vectorcall Vc_1::CpuId::init(void))
096 00000000 SECT13 notype       Static       | ?done@?2??init@CpuId@Vc_1@@SQXXZ@4_NA (bool `public: static void __vectorcall Vc_1::CpuId::init(void)'::`3'::done)

E:/VcDevel 
❯ grep 'isImplementationSupported' install/test.txt
015 00000000 SECT7  notype ()    External     | ?isImplementationSupported@Vc_1@@YQ_NW4Implementation@1@@Z (bool __vectorcall Vc_1::isImplementationSupported(enum Vc_1::Implementation))
025 00000000 SECT9  notype       Static       | $unwind$?isImplementationSupported@Vc_1@@YQ_NW4Implementation@1@@Z
028 00000000 SECTA  notype       Static       | $pdata$?isImplementationSupported@Vc_1@@YQ_NW4Implementation@1@@Z

All the functions are being specified as __vectorcall at compile time.

[bernhardmgruber]

There was a discussion on __vectorcall a while back: #147, but I am far too new on the project to know anything.
I believe __vectorcall is specified by default because /Gv is added as switch to MSVC, see: https://github.com/VcDevel/Vc/blob/1.4/cmake/VcMacros.cmake#L340.
It was added here: 65b58e7.

I honestly don't know why we default to __vectorcall, but I believe I read something about the compiler failing to pass function arguments, which are vectors, through registers.