[gcc r11-11032] Revert "libstdc++: Horrible macro hacks to allow building on avr"

[gcc r11-11032] Revert "libstdc++: Horrible macro hacks to allow building on avr"

[Jonathan Wakely]

https://gcc.gnu.org/g:7caac4e650f38f3bc341ef3513864605747af986

commit r11-11032-g7caac4e650f38f3bc341ef3513864605747af986
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Oct 3 16:08:41 2023 +0100

    Revert "libstdc++: Horrible macro hacks to allow building on avr"
    
    This reverts commit 061700c9f6f0f9f4219ddeb236d55764b42869b6.
    
    This hack will be unnecessary, as I'm backporting the __unsupported()
    utility from the later branches.
    
    libstdc++-v3/ChangeLog:
    
            * src/c++17/fs_ops.cc (not_supported):
            * src/filesystem/ops-common.h (ENOTSUP):

Diff:
---
 libstdc++-v3/src/c++17/fs_ops.cc         | 4 ----
 libstdc++-v3/src/filesystem/ops-common.h | 4 ----
 2 files changed, 8 deletions(-)

diff --git a/libstdc++-v3/src/c++17/fs_ops.cc b/libstdc++-v3/src/c++17/fs_ops.cc
index 802894ea5b5..4155b4d64b9 100644
--- a/libstdc++-v3/src/c++17/fs_ops.cc
+++ b/libstdc++-v3/src/c++17/fs_ops.cc
@@ -61,10 +61,6 @@
 #define _GLIBCXX_END_NAMESPACE_FILESYSTEM }
 #include "../filesystem/ops-common.h"
 
-#ifdef __AVR__
-# define not_supported function_not_supported
-#endif
-
 #pragma GCC diagnostic ignored "-Wunused-parameter"
 
 namespace fs = std::filesystem;
diff --git a/libstdc++-v3/src/filesystem/ops-common.h b/libstdc++-v3/src/filesystem/ops-common.h
index a680a51c984..54bafff2a9c 100644
--- a/libstdc++-v3/src/filesystem/ops-common.h
+++ b/libstdc++-v3/src/filesystem/ops-common.h
@@ -170,10 +170,6 @@ namespace __gnu_posix
 # endif
   using char_type = char;
 #else // ! _GLIBCXX_FILESYSTEM_IS_WINDOWS && ! _GLIBCXX_HAVE_UNISTD_H
-#ifdef __AVR__
-# define ENOTSUP ENOSYS
-#endif
-
   inline int open(const char*, int, ...) { errno = ENOTSUP; return -1; }
   inline int close(int) { errno = ENOTSUP; return -1; }
   using mode_t = int;