Export explicit instantiations for C++17 members of std::string

The C++17 standard added some new members to std::basic_string, which
were not previously instantiated in the library. This meant that the
extern template declarations had to be disabled for C++17 mode. With
this patch the new members are instantiated in the library and so the
explicit instantiation declarations can be used for C++17.

The new members added by C++2a are still not exported, and so the
explicit instantiation declarations are still disabled for C++2a.

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.21): Make patterns less greedy
	for const member functions of std::basic_string.
	(GLIBCXX_3.4.26): Export member functions of std::basic_string added
	in C++17.
	* include/bits/basic_string.h (basic_string(__sv_wrapper, const A&)):
	Make non-standard constructor private.
	[!_GLIBCXX_USE_CXX11_ABI] (basic_string(__sv_wrapper, const A&)):
	Likewise.
	* include/bits/basic_string.tcc (std::string, std::wstring): Declare
	explicit instantiations for C++17 as well as earlier dialects.
	* src/c++17/Makefile.am: Add new source files.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++17/cow-string-inst.cc: New file defining explicit
	instantiations for basic_string member functions added in C++17.
	* src/c++17/string-inst.cc: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@267585 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 23 insertions, 1 deletions

diff --git a/libstdc++-v3/config/abi/pre/gnu.ver b/libstdc++-v3/config/abi/pre/gnu.ver
index 1d157288fcf..6c18caa6d8a 100644
--- a/libstdc++-v3/config/abi/pre/gnu.ver
+++ b/libstdc++-v3/config/abi/pre/gnu.ver
@@ -1742,7 +1742,8 @@ GLIBCXX_3.4.21 {
     _ZNSt7__cxx1112basic_stringI[cw]St11char_traitsI[cw]ESaI[cw]EEC[12]Ev;
     _ZNSt7__cxx1112basic_stringI[cw]St11char_traitsI[cw]ESaI[cw]EEC[12]I[PN]*;
     _ZNSt7__cxx1112basic_stringI[cw]St11char_traitsI[cw]ESaI[cw]EE[Daip]*;
-    _ZNKSt7__cxx1112basic_string*;
+    _ZNKSt7__cxx1112basic_stringI[cw]St11char_traitsI[cw]ESaI[cw]EE[1-9]*;
+    _ZNKSt7__cxx1112basic_stringI[cw]St11char_traitsI[cw]ESaI[cw]EEixE[jmy];
 
     # operator+ for ABI-tagged std::basic_string
     _ZStplI[cw]St11char_traitsI[cw]ESaI[cw]EENSt7__cxx1112basic_stringIT_T0_T1_EE*;
@@ -2077,6 +2078,27 @@ GLIBCXX_3.4.26 {
     _ZNSbIwSt11char_traitsIwESaIwEEC[12]ERKS2_RKS1_;
     _ZNSbIwSt11char_traitsIwESaIwEEC[12]EOS2_RKS1_;
 
+    # basic_string<C, T, A>::operator basic_string_view<C, T>() const
+    _ZNKSscvSt17basic_string_viewIcSt11char_traitsIcEEEv;
+    _ZNKSbIwSt11char_traitsIwESaIwEEcvSt17basic_string_viewIwS0_EEv;
+    _ZNKSt7__cxx1112basic_stringI[cw]St11char_traitsI[cw]ESaI[cw]EEcvSt17basic_string_viewI[cw]S2_EEv;
+    # basic_string<C, T, A>::data()
+    _ZNSs4dataEv;
+    _ZNSbIwSt11char_traitsIwESaIwEE4dataEv;
+    _ZNSt7__cxx1112basic_stringI[cw]St11char_traitsI[cw]ESaI[cw]EE4dataEv;
+    # basic_string<C, T, A>::_S_to_string_view(basic_string_view<C, T>)
+    _ZNSs17_S_to_string_viewESt17basic_string_viewIcSt11char_traitsIcEE;
+    _ZNSbIwSt11char_traitsIwESaIwEE17_S_to_string_viewESt17basic_string_viewIwS0_E;
+    _ZNSt7__cxx1112basic_stringI[cw]St11char_traitsI[cw]ESaI[cw]EE17_S_to_string_viewESt17basic_string_viewI[cw]S2_E;
+    # basic_string<C, T, A>::__sv_wrapper::__sv_wrapper(basic_string_view<C, T>)
+    _ZNSs12__sv_wrapperC[12]ESt17basic_string_viewIcSt11char_traitsIcEE;
+    _ZNSbIwSt11char_traitsIwESaIwEE12__sv_wrapperC[12]ESt17basic_string_viewIwS0_E;
+    _ZNSt7__cxx1112basic_stringI[cw]St11char_traitsI[cw]ESaI[cw]EE12__sv_wrapperC[12]ESt17basic_string_viewI[cw]S2_E;
+    # basic_string<C, T, A>::basic_string(__sv_wrapper, const allocator_type&)
+    _ZNSsC[12]ENSs12__sv_wrapperERKSaIcE;
+    _ZNSbIwSt11char_traitsIwESaIwEEC[12]ENS2_12__sv_wrapperERKS1_;
+    _ZNSt7__cxx1112basic_stringI[cw]St11char_traitsI[cw]ESaI[cw]EEC[12]ENS4_12__sv_wrapperERKS3_;
+
 } GLIBCXX_3.4.25;
 
 # Symbols in the support library (libsupc++) have their own tag.