[gcc r10-10842] libstdc++: Rename __null_terminated to avoid collision with Apple SDK

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:7137ae4051ae71bb7fc7fd59d956952c53403239

commit r10-10842-g7137ae4051ae71bb7fc7fd59d956952c53403239
Author: Mark Mentovai <mark@mentovai.com>
Date:   Mon Jun 13 16:40:19 2022 +0100

    libstdc++: Rename __null_terminated to avoid collision with Apple SDK
    
    The macOS 13 SDK (and equivalent-version iOS and other Apple OS SDKs)
    contain this definition in <sys/cdefs.h>:
    
    863  #define __null_terminated
    
    This collides with the use of __null_terminated in libstdc++'s
    experimental fs_path.h.
    
    As libstdc++'s use of this token is entirely internal to fs_path.h, the
    simplest workaround, renaming it, is most appropriate. Here, it's
    renamed to __nul_terminated, referencing the NUL ('\0') value that is
    used to terminate the strings in the context in which this tag structure
    is used.
    
    libstdc++-v3/ChangeLog:
    
            * include/experimental/bits/fs_path.h (__detail::__null_terminated):
            Rename to __nul_terminated to avoid colliding with a macro in
            Apple's SDK.
    
    Signed-off-by: Mark Mentovai <mark@mentovai.com>
    (cherry picked from commit 254e88b3d7e8abcc236be3451609834371cf4d5d)

Diff:
---
 libstdc++-v3/include/experimental/bits/fs_path.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/libstdc++-v3/include/experimental/bits/fs_path.h b/libstdc++-v3/include/experimental/bits/fs_path.h
index 0a8f4eee0a1..11b4ce0fe58 100644
--- a/libstdc++-v3/include/experimental/bits/fs_path.h
+++ b/libstdc++-v3/include/experimental/bits/fs_path.h
@@ -140,10 +140,10 @@ namespace __detail
     inline _Source
     _S_range_begin(_Source __begin) { return __begin; }
 
-  struct __null_terminated { };
+  struct __nul_terminated { };
 
   template<typename _Source>
-    inline __null_terminated
+    inline __nul_terminated
     _S_range_end(_Source) { return {}; }
 
   template<typename _CharT, typename _Traits, typename _Alloc>
@@ -467,11 +467,11 @@ namespace __detail
       struct _Cvt;
 
     static string_type
-    _S_convert(value_type* __src, __detail::__null_terminated)
+    _S_convert(value_type* __src, __detail::__nul_terminated)
     { return string_type(__src); }
 
     static string_type
-    _S_convert(const value_type* __src, __detail::__null_terminated)
+    _S_convert(const value_type* __src, __detail::__nul_terminated)
     { return string_type(__src); }
 
     template<typename _Iter>
@@ -485,7 +485,7 @@ namespace __detail
 
     template<typename _InputIterator>
       static string_type
-      _S_convert(_InputIterator __src, __detail::__null_terminated)
+      _S_convert(_InputIterator __src, __detail::__nul_terminated)
       {
 	auto __s = _S_string_from_iter(__src);
 	return _S_convert(__s.c_str(), __s.c_str() + __s.size());
@@ -505,7 +505,7 @@ namespace __detail
 
     template<typename _InputIterator>
       static string_type
-      _S_convert_loc(_InputIterator __src, __detail::__null_terminated,
+      _S_convert_loc(_InputIterator __src, __detail::__nul_terminated,
 		     const std::locale& __loc)
       {
 	const std::string __s = _S_string_from_iter(__src);