Commenting out pragmas as an experiment to reproduce previous observation.

Author: rwgk

include/pybind11/eigen.h

@@ -18,6 +18,7 @@
 #define PYBIND11_COMPATIBILITY_WDEPRECATED_COPY
 #endif
 
+/*
 #if defined(__GNUC__)
 // These suppressions are needed only for certain compilers and versions of Eigen, but:
 // * Maintaining narrowly defined ifdefs is very complicated/expensive.
@@ -29,6 +30,7 @@
 #  pragma GCC diagnostic ignored "-Wdeprecated-copy-dtor"
 #endif
 #endif
+*/
 
 #include <Eigen/Core>
 #include <Eigen/SparseCore>
@@ -87,16 +89,20 @@ template <bool EigenRowMajor> struct EigenConformable {
         if (rstride < 0 || cstride < 0) {
             negativestrides = true;
         } else {
+/*
 #if defined(PYBIND11_COMPATIBILITY_WDEPRECATED_COPY)
 // Suppressing warning originating from Eigen header.
 #  pragma GCC diagnostic push
 #  pragma GCC diagnostic ignored "-Wdeprecated-copy"
 #endif
+*/
             stride = {EigenRowMajor ? rstride : cstride /* outer stride */,
                       EigenRowMajor ? cstride : rstride /* inner stride */ };
+/*
 #if defined(PYBIND11_COMPATIBILITY_WDEPRECATED_COPY)
 #  pragma GCC diagnostic pop
 #endif
+*/
         }
     }
     // Vector type: