[libc++] add `inline` for __open's definition in ifstream and ofstream

Summary:

When building with gcc on AIX, it seems that gcc does not like the
`always_inline` without the `inline` keyword.
So adding the inline keywords in for __open in ifstream and ofstream.
That will also make it consistent with __open in basic_filebuf
(it seems we added `inline` there before for gcc build as well).

Differential Revision: https://reviews.llvm.org/D99422

diff --git a/libcxx/include/fstream b/libcxx/include/fstream
index 51b26ec..9129365 100644 (file)
--- a/libcxx/include/fstream
+++ b/libcxx/include/fstream
@@ -247,7 +247,7 @@ public:
       return open(__p.c_str(), __mode);
     }
 #endif
-    inline _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY
     basic_filebuf* __open(int __fd, ios_base::openmode __mode);
 #endif
     basic_filebuf* close();
@@ -577,7 +577,7 @@ basic_filebuf<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
 }
 
 template <class _CharT, class _Traits>
-inline _LIBCPP_INLINE_VISIBILITY
+inline
 basic_filebuf<_CharT, _Traits>*
 basic_filebuf<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) {
   basic_filebuf<_CharT, _Traits>* __rt = nullptr;
@@ -1329,6 +1329,7 @@ basic_ifstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mo
 }
 
 template <class _CharT, class _Traits>
+inline
 void basic_ifstream<_CharT, _Traits>::__open(int __fd,
                                              ios_base::openmode __mode) {
   if (__sb_.__open(__fd, __mode | ios_base::in))
@@ -1542,6 +1543,7 @@ basic_ofstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mo
 }
 
 template <class _CharT, class _Traits>
+inline
 void basic_ofstream<_CharT, _Traits>::__open(int __fd,
                                              ios_base::openmode __mode) {
   if (__sb_.__open(__fd, __mode | ios_base::out))