https://github.com/jeremyd2019 updated
https://github.com/llvm/llvm-project/pull/140169
>From 47f81a804a36a5b685f130f22d2ab5d330170861 Mon Sep 17 00:00:00 2001
From: kikairoya <kikair...@gmail.com>
Date: Mon, 21 Apr 2025 23:30:13 +0900
Subject: [PATCH 1/2] [Cygwin][MinGW] Internal class in
explicitly-instantiation-declarated template should be instantiated
In-code comment says "explicit instantiation decl of the outer class
doesn't affect the inner class" but this behavior seems MSVC
specific, MinGW-GCC and Cygwin-GCC does not.
Clang should honor gcc's behavior.
This change fixes std::string compatibilty and resolves strange link
error (statically linked), strange crash (dynamically linked) using
libstdc++ on Cygwin.
---
clang/lib/Sema/SemaTemplateInstantiate.cpp | 1 +
.../CodeGenCXX/mingw-template-dllexport.cpp | 109 +++++++++++++++---
2 files changed, 93 insertions(+), 17 deletions(-)
diff --git a/clang/lib/Sema/SemaTemplateInstantiate.cpp
b/clang/lib/Sema/SemaTemplateInstantiate.cpp
index d028eea4f8f3e..b7c27b3795f5d 100644
--- a/clang/lib/Sema/SemaTemplateInstantiate.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiate.cpp
@@ -4247,6 +4247,7 @@ Sema::InstantiateClassMembers(SourceLocation
PointOfInstantiation,
continue;
if (Context.getTargetInfo().getTriple().isOSWindows() &&
+ !Context.getTargetInfo().getTriple().isOSCygMing() &&
TSK == TSK_ExplicitInstantiationDeclaration) {
// On Windows, explicit instantiation decl of the outer class doesn't
// affect the inner class. Typically extern template declarations are
diff --git a/clang/test/CodeGenCXX/mingw-template-dllexport.cpp
b/clang/test/CodeGenCXX/mingw-template-dllexport.cpp
index de112d6da53db..a6047b5955e96 100644
--- a/clang/test/CodeGenCXX/mingw-template-dllexport.cpp
+++ b/clang/test/CodeGenCXX/mingw-template-dllexport.cpp
@@ -6,46 +6,121 @@
#define JOIN2(x, y) x##y
#define JOIN(x, y) JOIN2(x, y)
#define UNIQ(name) JOIN(name, __LINE__)
-#define USEMEMFUNC(class, func) void (class::*UNIQ(use)())() { return
&class::func; }
+#define USEMEMFUNC(class, func) auto UNIQ(use) = &class::func;
template <class T>
class c {
+ // MinGW-GCC does not apply 'dllexport' to inline member function in
dll-exported template but clang does from long ago.
void f() {}
+ void g();
+ inline static int u = 0;
+ static int v;
};
+template <class T> void c<T>::g() {}
+template <class T> int c<T>::v = 0;
+// #1
template class __declspec(dllexport) c<int>;
-// CHECK: define {{.*}} dllexport {{.*}} @_ZN1cIiE1fEv
-
+// #2
extern template class __declspec(dllexport) c<char>;
template class c<char>;
-// CHECK: define {{.*}} dllexport {{.*}} @_ZN1cIcE1fEv
-
+// #3
extern template class c<double>;
-template class __declspec(dllexport) c<double>;
+template class __declspec(dllexport) c<double>; // expected-warning {{
'dllexport' attribute ignored on explicit instantiation definition }}
-// CHECK-NOT: define {{.*}} dllexport {{.*}} @_ZN1cIdE1fEv
template <class T>
struct outer {
- void f();
+ void f() {}
+ void g();
+ inline static int u = 0;
+ static int v;
+ // MinGW-GCC and Clang does not apply 'dllexport' to inner type and its
sub-elements in template class.
struct inner {
- void f();
+ void f() {}
+ void g();
+ inline static int u = 0;
+ static int v;
};
};
-template <class T> void outer<T>::f() {}
-template <class T> void outer<T>::inner::f() {}
+template <class T> void outer<T>::g() {}
+template <class T> void outer<T>::inner::g() {}
+template <class T> int outer<T>::v = 0;
+template <class T> int outer<T>::inner::v = 0;
-template class __declspec(dllexport) outer<int>;
+// #4
+template struct __declspec(dllexport) outer<int>;
-// CHECK: define {{.*}} dllexport {{.*}} @_ZN5outerIiE1fEv
-// CHECK-NOT: define {{.*}} dllexport {{.*}} @_ZN5outerIiE5inner1fEv
-
-extern template class __declspec(dllimport) outer<char>;
+// #5
+extern template struct __declspec(dllimport) outer<char>;
USEMEMFUNC(outer<char>, f)
+USEMEMFUNC(outer<char>, g)
+USEMEMFUNC(outer<char>, u)
+USEMEMFUNC(outer<char>, v)
USEMEMFUNC(outer<char>::inner, f)
+USEMEMFUNC(outer<char>::inner, g)
+USEMEMFUNC(outer<char>::inner, u)
+USEMEMFUNC(outer<char>::inner, v)
+
+
+// #1 variables
+// CHECK: @_ZN1cIiE1uE = {{.*}} dllexport {{.*}}
+// CHECK: @_ZN1cIiE1vE = {{.*}} dllexport {{.*}}
+
+// #2 variables
+// CHECK: @_ZN1cIcE1uE = {{.*}} dllexport {{.*}}
+// CHECK: @_ZN1cIcE1vE = {{.*}} dllexport {{.*}}
+
+// #3 variables
+// CHECK: @_ZN1cIdE1uE = {{.*}}
+// CHECK-NOT: @_ZN1cIcE1uE = {{.*}} dllexport {{.*}}
+// CHECK: @_ZN1cIdE1vE = {{.*}}
+// CHECK-NOT: @_ZN1cIcE1vE = {{.*}} dllexport {{.*}}
+
+// #4 variables
+// CHECK: @_ZN5outerIiE1uE = {{.*}} dllexport {{.*}}
+// CHECK: @_ZN5outerIiE1vE = {{.*}} dllexport {{.*}}
+// CHECK: @_ZN5outerIiE5inner1uE = {{.*}}
+// CHECK-NOT: @_ZN5outerIiE5inner1uE = {{.*}} dllexport {{.*}}
+// CHECK: @_ZN5outerIiE5inner1vE = {{.*}}
+// CHECK-NOT: @_ZN5outerIiE5inner1vE = {{.*}} dllexport {{.*}}
+
+// #5 variables
+// CHECK: @_ZN5outerIcE1uE = external dllimport {{.*}}
+// CHECK: @_ZN5outerIcE1vE = external dllimport {{.*}}
+// CHECK-NOT: @_ZN5outerIcE5inner1uE = dllimport {{.*}}
+// CHECK-NOT: @_ZN5outerIcE5inner1vE = dllimport {{.*}}
+// CHECK: @_ZN5outerIcE5inner1uE = external {{.*}}
+// CHECK: @_ZN5outerIcE5inner1vE = external {{.*}}
+
+
+// #1 functions
+// CHECK: define {{.*}} dllexport {{.*}} @_ZN1cIiE1fEv
+// CHECK: define {{.*}} dllexport {{.*}} @_ZN1cIiE1gEv
+
+// #2 functions
+// CHECK: define {{.*}} dllexport {{.*}} @_ZN1cIcE1fEv
+// CHECK: define {{.*}} dllexport {{.*}} @_ZN1cIcE1gEv
+
+// #3 functions
+// CHECK-NOT: define {{.*}} dllexport {{.*}} @_ZN1cIdE1fEv
+// CHECK-NOT: define {{.*}} dllexport {{.*}} @_ZN1cIdE1gEv
+
+// #4 functions
+// CHECK: define {{.*}} dllexport {{.*}} @_ZN5outerIiE1fEv
+// CHECK: define {{.*}} dllexport {{.*}} @_ZN5outerIiE1gEv
+// CHECK-NOT: define {{.*}} dllexport {{.*}} @_ZN5outerIiE5inner1fEv
+// CHECK-NOT: define {{.*}} dllexport {{.*}} @_ZN5outerIiE5inner1gEv
+// #5 functions
// CHECK: declare dllimport {{.*}} @_ZN5outerIcE1fEv
-// CHECK: define {{.*}} @_ZN5outerIcE5inner1fEv
+// CHECK: declare dllimport {{.*}} @_ZN5outerIcE1gEv
+// CHECK-NOT: declare dllimport {{.*}} @_ZN5outerIcE5inner1fEv
+// CHECK-NOT: declare dllimport {{.*}} @_ZN5outerIcE5inner1gEv
+// CHECK-NOT: define {{.*}} @_ZN5outerIcE1fEv
+// CHECK-NOT: define {{.*}} @_ZN5outerIcE5inner1fEv
+// CHECK-NOT: define {{.*}} @_ZN5outerIcE1gEv
+// CHECK-NOT: define {{.*}} @_ZN5outerIcE5inner1gEv
>From 84e2db635862c89d10d2b0a8aa90b7abbbc8af03 Mon Sep 17 00:00:00 2001
From: Jeremy Drake <git...@jdrake.com>
Date: Mon, 19 May 2025 16:01:57 -0700
Subject: [PATCH 2/2] test _LIBCPP_HIDE_FROM_ABI on sentry methods
---
libcxx/include/__ostream/basic_ostream.h | 8 ++++----
libcxx/include/istream | 2 +-
2 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/libcxx/include/__ostream/basic_ostream.h
b/libcxx/include/__ostream/basic_ostream.h
index f7473a36d8ccc..44d2d0fe672ec 100644
--- a/libcxx/include/__ostream/basic_ostream.h
+++ b/libcxx/include/__ostream/basic_ostream.h
@@ -186,10 +186,10 @@ class basic_ostream<_CharT, _Traits>::sentry {
basic_ostream<_CharT, _Traits>& __os_;
public:
- explicit sentry(basic_ostream<_CharT, _Traits>& __os);
- ~sentry();
- sentry(const sentry&) = delete;
- sentry& operator=(const sentry&) = delete;
+ _LIBCPP_HIDE_FROM_ABI explicit sentry(basic_ostream<_CharT, _Traits>& __os);
+ _LIBCPP_HIDE_FROM_ABI ~sentry();
+ _LIBCPP_HIDE_FROM_ABI sentry(const sentry&) = delete;
+ _LIBCPP_HIDE_FROM_ABI sentry& operator=(const sentry&) = delete;
_LIBCPP_HIDE_FROM_ABI explicit operator bool() const { return __ok_; }
};
diff --git a/libcxx/include/istream b/libcxx/include/istream
index 95340c739c118..dff1d6d993f31 100644
--- a/libcxx/include/istream
+++ b/libcxx/include/istream
@@ -309,7 +309,7 @@ class basic_istream<_CharT, _Traits>::sentry {
bool __ok_;
public:
- explicit sentry(basic_istream<_CharT, _Traits>& __is, bool __noskipws =
false);
+ _LIBCPP_HIDE_FROM_ABI explicit sentry(basic_istream<_CharT, _Traits>& __is,
bool __noskipws = false);
// ~sentry() = default;
_LIBCPP_HIDE_FROM_ABI explicit operator bool() const { return __ok_; }
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