[gcc r9-9375] libstdc++: Handle EPERM for filesystem access errors on MacOS [PR 99537]

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

https://gcc.gnu.org/g:b06bc096c4da89d8880f86fb0d9627168f22c50d

commit r9-9375-gb06bc096c4da89d8880f86fb0d9627168f22c50d
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Mar 11 16:43:51 2021 +0000

    libstdc++: Handle EPERM for filesystem access errors on MacOS [PR 99537]
    
    Contrary to what POSIX says, some directory operations on MacOS can fail
    with EPERM instead of EACCES, so we need to handle both.
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/99533
            * src/c++17/fs_dir.cc (recursive_directory_iterator): Use new
            helper function to check for permission denied errors.
            * src/filesystem/dir.cc (recursive_directory_iterator):
            Likewise.
            * src/filesystem/dir-common.h (is_permission_denied_error): New
            helper function.
    
    (cherry picked from commit 8cfb387388a90730ab36ac24d9049677db633a11)

Diff:
---
 libstdc++-v3/src/c++17/fs_dir.cc         |  2 +-
 libstdc++-v3/src/filesystem/dir-common.h | 12 ++++++++++++
 libstdc++-v3/src/filesystem/dir.cc       |  2 +-
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/src/c++17/fs_dir.cc b/libstdc++-v3/src/c++17/fs_dir.cc
index bcbcd7ba6b3..b4d6862fe34 100644
--- a/libstdc++-v3/src/c++17/fs_dir.cc
+++ b/libstdc++-v3/src/c++17/fs_dir.cc
@@ -211,7 +211,7 @@ recursive_directory_iterator(const path& p, directory_options options,
   else
     {
       const int err = errno;
-      if (err == EACCES
+      if (fs::is_permission_denied_error(err)
 	  && is_set(options, fs::directory_options::skip_permission_denied))
 	{
 	  if (ecptr)
diff --git a/libstdc++-v3/src/filesystem/dir-common.h b/libstdc++-v3/src/filesystem/dir-common.h
index 6ec798c9aa0..97ad70f834e 100644
--- a/libstdc++-v3/src/filesystem/dir-common.h
+++ b/libstdc++-v3/src/filesystem/dir-common.h
@@ -141,6 +141,18 @@ struct _Dir_base
   posix::DIR*	dirp;
 };
 
+inline bool
+is_permission_denied_error(int e)
+{
+  if (e == EACCES)
+    return true;
+#ifdef __APPLE__
+  if (e == EPERM) // See PR 99533
+    return true;
+#endif
+  return false;
+}
+
 } // namespace filesystem
 
 // BEGIN/END macros must be defined before including this file.
diff --git a/libstdc++-v3/src/filesystem/dir.cc b/libstdc++-v3/src/filesystem/dir.cc
index d7d8eb74066..b3978f82b51 100644
--- a/libstdc++-v3/src/filesystem/dir.cc
+++ b/libstdc++-v3/src/filesystem/dir.cc
@@ -202,7 +202,7 @@ recursive_directory_iterator(const path& p, directory_options options,
   else
     {
       const int err = errno;
-      if (err == EACCES
+      if (std::filesystem::is_permission_denied_error(err)
 	  && is_set(options, fs::directory_options::skip_permission_denied))
 	{
 	  if (ecptr)