Created attachment 294 [details] Sample C++ code producing the warning Compiling the attachment with -Wextra results in a warning with g++ 4.7.1 (with g++ 4.2.1 there is no warning) $ g++-4.7 -Wextra -o a a.cc In file included from Eigen/Core:246:0, from Eigen/SparseCore:4, from Eigen/Sparse:17, from a.cc:3: Eigen/src/Core/util/XprHelper.h: In instantiation of 'struct Eigen::internal::nested<Eigen::SparseSparseProduct<const Eigen::SparseMatrix<double>&, const Eigen::SparseMatrix<double>&>, 1, Eigen::SparseMatrix<double, 6, int> >': Eigen/src/SparseCore/SparseProduct.h:85:5: required from 'class Eigen::SparseSparseProduct<const Eigen::SparseMatrix<double>&, const Eigen::SparseMatrix<double>&>' a.cc:11:32: required from here Eigen/src/Core/util/XprHelper.h:296:8: warning: enumeral and non-enumeral type in conditional expression [enabled by default]
A quick fix is to modify ScalarReadCostAsInteger and CoeffReadCostAsInteger: in XprHelper.h (line 304) ... ScalarReadCostAsInteger = ScalarReadCost == Dynamic ? int(DynamicAsInteger) : int(ScalarReadCost), ... CoeffReadCostAsInteger = CoeffReadCost == Dynamic ? int(DynamicAsInteger) : int(CoeffReadCost), ...
thanks for the report, https://bitbucket.org/eigen/eigen/changeset/c7a5c5a5658d/ changeset: c7a5c5a5658d user: ggael date: 2012-09-26 23:32:22 summary: fix bug 509: warning with gcc 4.7 https://bitbucket.org/eigen/eigen/changeset/8fe4e0bd2fa5/ changeset: 8fe4e0bd2fa5 branch: 3.1 user: ggael date: 2012-09-26 23:32:22 summary: fix bug 509: warning with gcc 4.7 (transplanted from c7a5c5a5658d8b83b7d764b359e908fbc70a985b)
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