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Compilation error from including headers on

Submitted by Zsbán Ambrus

Assigned to Nobody

Link to original bugzilla bug (#1363)
Version: 3.3 (current stable)
Operating system: Windows

Description

Created attachment 759
complete error output and hello world executable

I'm trying to compile a hello world program with gcc to windows x86_64. I get a thousand line's worth of compilation errors from just including <Eigen/Core>.

The first error message is:

In file included from ../eigen3/Eigen/Core:362:0,  
		 from droppipe.cpp:1:  
../eigen3/Eigen/src/Core/arch/AVX/PacketMath.h:120:108: error: 'Packet Eigen::internal::pset1(const typename Eigen::internal::unpacket_traits&lt;Packet&gt;::type&) [with Packet = __vector(8) float; typename Eigen::internal::unpacket_traits&lt;Packet&gt;::type = float]' conflicts with a previous declaration  
 template&lt;&gt; EIGEN_STRONG_INLINE Packet8f pset1&lt;Packet8f&gt;(const float&  from) { return _mm256_set1_ps(from); }  
													    ^  
In file included from ../eigen3/Eigen/Core:359:0,  
		 from droppipe.cpp:1:  
../eigen3/Eigen/src/Core/arch/SSE/PacketMath.h:178:41: note: previous declaration 'Packet Eigen::internal::pset1(const typename Eigen::internal::unpacket_traits&lt;Packet&gt;::type&) [with Packet = __vector(4) float; typename Eigen::internal::unpacket_traits&lt;Packet&gt;::type = float]'  
 template&lt;&gt; EIGEN_STRONG_INLINE Packet4f pset1&lt;Packet4f&gt;(const float&  from) { return _mm_set_ps1(from); }  
					 ^  
In file included from ../eigen3/Eigen/Core:362:0,  
		 from droppipe.cpp:1:  
../eigen3/Eigen/src/Core/arch/AVX/PacketMath.h:120:41: note: -fabi-version=6 (or =0) avoids this error with a change in mangling  
 template&lt;&gt; EIGEN_STRONG_INLINE Packet8f pset1&lt;Packet8f&gt;(const float&  from) { return _mm256_set1_ps(from); }  
					 ^

The compiler is windows gcc 4.8.3 targetting windows x86_64 with AVX instructions. The compiler installation binary comes from win-builds 1.5.0 x86_64 windows (see "http://win-builds.org/doku.php"). Note though that win-builds contains multiple versions of gcc, including ones targetting MSYS and Cygwin. This is the one that "C:\Win-builds\bin\c++.exe" starts. The complete command line is

wib g++ -std=c++1y -mtune=corei7-avx -mavx -fno-math-errno -Wall -Wextra -O2 -I ../eigen3 -pthread -o droppipe droppipe.cpp

where wib is a simple wrapper batch file that does set PATH=C:\Win-builds\bin;%PATH% so that the compiler can load its dynamic libraries.

ChriSopht says the errors are because in this c++ mangling with gcc, __m128 and __m256 types are indistinguishable, but Eigen is supposed to have a workaround for this.

You can find the complete error output and the hello world source file in the attachment.

Attachment 759, "complete error output and hello world executable":
errors.txt

Edited by Eigen Bugzilla