MSYS2上的gcc 8.2.1的特征编译错误

Question

我们是facing errors针对Eigen 3.3.7（可能是旧版本）针对MSYS2提供的最新版GCC 8.2.1进行编译。奇怪的是，这只发生在同一个软件包的最新版本中（mingw-w64-x86_64-gcc 8.2.1）：

• 8.2.1 + 20181123-1：很好
• 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);

                             ^

我假设这是MSYS2提供的GCC包中的一个错误，而不是Eigen（据我所知，SparseBlock.h文件暂时没有改变）。不同的GCC是否基于相同的源代码构建？知道问题可能是什么吗？

---

编辑：这是一个MCVE：

TEST.CPP：

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

使用g ++ 8.2.1编译（版本8.2.1 + 20181130-1或更新版本 - 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);
                                 ^

Answer 1

进一步调查表明这确实是一个GCC错误。我有reported this on GCC Bugzilla，我会关闭这个帖子。谢谢！