MSYS2上使用GCC 8.2.1的本本汇编误差

Eigen compilation error with gcc 8.2.1 on MSYS2

本文关键字：汇编 误差 GCC MSYS2      更新时间：2023-10-16

我们面临着针对eigen 3.3.7（以及较旧版本）的错误，该错误针对MSYS2提供的最新版本的GCC 8.2.1。奇怪的是，这仅在同一软件包的最新版本（mingw-w64-x86_64-gcc 8.2.1）中发生。

  • 8.2.1 20181123-1：Fine
  • 8.2.1 20181130-1：错误
  • 8.2.1 20181207-1：错误

错误是：

In file included from C:/Users/donald/msys64/mingw64/include/eigen3/Eigen/SparseCore:50,
                 from C:/Users/donald/msys64/mingw64/include/eigen3/Eigen/Sparse:26,
                 from C:/Users/donald/msys64/mingw64/include/eigen3/Eigen/Eigen:2,
                 from src/registration/transform/search.h:21,
                 from src/registration/transform/initialiser_helpers.cpp:20:
C:/Users/donald/msys64/mingw64/include/eigen3/Eigen/src/SparseCore/SparseBlock.h: In member function 'Eigen::internal::sparse_matrix_block_impl<SparseMatrixType, BlockRows, BlockCols>::BlockType& Eigen::internal::sparse_matrix_block_impl<SparseMatrixType, BlockRows, BlockCols>::operator=(const BlockType&)':
C:/Users/donald/msys64/mingw64/include/eigen3/Eigen/src/SparseCore/SparseBlock.h:216:33: error: expected primary-expression before '>' token
       return operator=<BlockType>(other);
                             ^

我认为这是MSYS2提供的GCC软件包中的一个错误（据我所知，SparseBlock.h文件已经有一段时间没有更改）。是否基于相同的源代码构建不同的GCC？知道问题可能是什么？

编辑：这是MCVE：

test.cpp：

#include <Eigen/Eigen>
int main () { return 0; }

用G 8.2.1编译（版本8.2.1 20181130-1或更新 - 较旧版本没有错误）：

$ g++ $(pkg-config --cflags eigen3) test.cpp -o test
In file included from C:/Users/donald/msys64/mingw64/include/eigen3/Eigen/SparseCore:50,
                 from C:/Users/donald/msys64/mingw64/include/eigen3/Eigen/Sparse:26,
                 from C:/Users/donald/msys64/mingw64/include/eigen3/Eigen/Eigen:2,
                 from test.cpp:1:
C:/Users/donald/msys64/mingw64/include/eigen3/Eigen/src/SparseCore/SparseBlock.h: In member function 'Eigen::internal::sparse_matrix_block_impl<SparseMatrixType, BlockRows, BlockCols>::BlockType& Eigen::internal::sparse_matrix_block_impl<SparseMatrixType, BlockRows, BlockCols>::operator=(const BlockType&)':
C:/Users/donald/msys64/mingw64/include/eigen3/Eigen/src/SparseCore/SparseBlock.h:216:33: error: expected primary-expression before '>' token
       return operator=<BlockType>(other);
                                 ^

进一步研究表明这确实是GCC错误。我已经在GCC Bugzilla上报告了这一点，我将关闭此线程。谢谢！

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