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bootstrap: Check support for unordered_map from compiler mode

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Some versions of clang 5 (with libc++) have a problem with
`unordered_map` under `-std=gnu++1z`:

    /usr/include/c++/__hash_table:1134:43: error: conflicting types for '__hash_table<_Tp, _Hash, _Equal, _Alloc>'

Include `unordered_map` in our test source so that we reject this
combination and fall back to an older C++ standard flag.

Fixes: #17526
This commit is contained in:
Adam Ciarciński 2017-11-30 13:57:12 -05:00 committed by Brad King
parent 7746fdb2fe
commit 375eca7881
1 changed files with 1 additions and 0 deletions
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@ -1056,6 +1056,7 @@ TMPFILE=`cmake_tmp_file`
echo '
#include <iostream>
#include <memory>
#include <unordered_map>
#if __cplusplus < 201103L
#error "Compiler is not in a mode aware of C++11."