work around internal compiler error with gcc 4.1 and 4.2, reported on the forum
diff --git a/Eigen/src/Core/Product.h b/Eigen/src/Core/Product.h
index e1e106b..d70344d 100644
--- a/Eigen/src/Core/Product.h
+++ b/Eigen/src/Core/Product.h
@@ -61,11 +61,22 @@
enum {
Rows = Lhs::RowsAtCompileTime,
Cols = Rhs::ColsAtCompileTime,
- Depth = EIGEN_ENUM_MIN(Lhs::ColsAtCompileTime,Rhs::RowsAtCompileTime),
-
- value = ei_product_type_selector<(Rows >=EIGEN_CACHEFRIENDLY_PRODUCT_THRESHOLD ? Large : (Rows==1 ? 1 : Small)),
- (Cols >=EIGEN_CACHEFRIENDLY_PRODUCT_THRESHOLD ? Large : (Cols==1 ? 1 : Small)),
- (Depth>=EIGEN_CACHEFRIENDLY_PRODUCT_THRESHOLD ? Large : (Depth==1 ? 1 : Small))>::ret
+ Depth = EIGEN_ENUM_MIN(Lhs::ColsAtCompileTime,Rhs::RowsAtCompileTime)
+ };
+
+ // the splitting into different lines of code here, introducing the _select enums and the typedef below,
+ // is to work around an internal compiler error with gcc 4.1 and 4.2.
+private:
+ enum {
+ rows_select = Rows >=EIGEN_CACHEFRIENDLY_PRODUCT_THRESHOLD ? Large : (Rows==1 ? 1 : Small),
+ cols_select = Cols >=EIGEN_CACHEFRIENDLY_PRODUCT_THRESHOLD ? Large : (Cols==1 ? 1 : Small),
+ depth_select = Depth>=EIGEN_CACHEFRIENDLY_PRODUCT_THRESHOLD ? Large : (Depth==1 ? 1 : Small)
+ };
+ typedef ei_product_type_selector<rows_select, cols_select, depth_select> product_type_selector;
+
+public:
+ enum {
+ value = product_type_selector::ret
};
};
