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[PATCH] Disable std::string and std::wstring extern templates for C++17

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Mon, 1 Aug 2016 17:05:56 +0100
Subject: [PATCH] Disable std::string and std::wstring extern templates for C++17
Authentication-results: sourceware.org; auth=none

As I mentioned last week, the explicit instantiation definitions for
std::string and std::wstring are compiled as C++11, so do not
instantiate the new member functions added for C++17.

Rather than change what we instantiate and export from the library I'd
prefer to suppress the explicit instantiation declarations for C++17.
Once C++17 is stable and we know which new symbols are needed we can
decide whether to change how we compile the instantiations, and add
new exports to the linker script.

	* include/bits/basic_string.tcc: Disable explicit instantiation
	declarations for C++17.

Tested powerpc64-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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