[gcc r12-7691] libstdc++: Avoid including <algorithm> in <filesystem> [PR92546]

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

https://gcc.gnu.org/g:00df7ee4474faca91d3460fe78a88e280c6c1126

commit r12-7691-g00df7ee4474faca91d3460fe78a88e280c6c1126
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Mar 17 14:36:07 2022 +0000

    libstdc++: Avoid including <algorithm> in <filesystem> [PR92546]
    
    This only affects Windows, but reduces the preprocessed size of
    <filesystem> significantly.
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/92546
            * include/bits/fs_path.h (path::make_preferred): Use
            handwritten loop instead of std::replace.

Diff:
---
 libstdc++-v3/include/bits/fs_path.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/libstdc++-v3/include/bits/fs_path.h b/libstdc++-v3/include/bits/fs_path.h
index b16a878f24b..9e06fa679d8 100644
--- a/libstdc++-v3/include/bits/fs_path.h
+++ b/libstdc++-v3/include/bits/fs_path.h
@@ -52,7 +52,6 @@
 
 #if defined(_WIN32) && !defined(__CYGWIN__)
 # define _GLIBCXX_FILESYSTEM_IS_WINDOWS 1
-# include <algorithm>
 #endif
 
 namespace std _GLIBCXX_VISIBILITY(default)
@@ -1060,8 +1059,12 @@ namespace __detail
   path::make_preferred()
   {
 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
-    std::replace(_M_pathname.begin(), _M_pathname.end(), L'/',
-		 preferred_separator);
+    auto __pos = _M_pathname.find(L'/');
+    while (__pos != _M_pathname.npos)
+      {
+	_M_pathname[__pos] = preferred_separator;
+	__pos = _M_pathname.find(L'/', __pos);
+      }
 #endif
     return *this;
   }