From 69adf26aa3e853418002562f623c42a9c7008271 Mon Sep 17 00:00:00 2001
From: Antonio Sanchez <cantonios@google.com>
Date: Fri, 9 Apr 2021 19:50:19 -0700
Subject: Modify googlehash use to account for namespace issues.

The namespace declaration for googlehash is a configurable macro that
can be disabled.  In particular, it is disabled within google, causing
compile errors since `dense_hash_map`/`sparse_hash_map` are then in
the global namespace instead of in `::google`.

Here we play a bit of gynastics to allow for both `google::*_hash_map`
and `*_hash_map`, while limiting namespace polution.  Symbols within
the `::google` namespace are imported into `Eigen::google`.

We also remove checks based on `_SPARSE_HASH_MAP_H_`, as this is
fragile, and instead require `EIGEN_GOOGLEHASH_SUPPORT` to be
defined.
---
 unsupported/Eigen/SparseExtra | 1 +
 1 file changed, 1 insertion(+)

(limited to 'unsupported/Eigen/SparseExtra')

diff --git a/unsupported/Eigen/SparseExtra b/unsupported/Eigen/SparseExtra
index 819cffa27..ba5cbd661 100644
--- a/unsupported/Eigen/SparseExtra
+++ b/unsupported/Eigen/SparseExtra
@@ -24,6 +24,7 @@
 
 #ifdef EIGEN_GOOGLEHASH_SUPPORT
   #include <google/dense_hash_map>
+  #include <google/sparse_hash_map>
 #endif
 
 /**
-- 
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