Created attachment 643 [details] Minimal example code to reproduce the bug. In the file Eigen_Colamd.h, the line 519 "if (Col [col].length < 0)" can sometimes lead to compilation errors depending on the surrounding user code. A seemingly benign minimal example is given in attachment, where the user creates a templated "length" function, included in a header before Eigen. This leads to compilation errors "Eigen_Colamd.h:519:19: error: parse error in template argument list" and "Eigen_Colamd.h:519:5: error: ‘length’ is not a member template function". Using > instead of < for the comparison does the trick here, but there might be some other places where such an issue can arise.
Thanks for the report. This is likely caused by a gcc bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=10200 I worked-around using parentheses (for devel and 3.2): https://bitbucket.org/eigen/eigen/commits/667570c89d3 https://bitbucket.org/eigen/eigen/commits/56ce6e48d77
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