[gcc r16-4443] libstdc++: Enable features for RTEMS (based on GCC 15)

[Joel Sherrill]

https://gcc.gnu.org/g:651bf5126da12488f9af0e42bd9924f1058a7d43

commit r16-4443-g651bf5126da12488f9af0e42bd9924f1058a7d43
Author: Chris Johns <chrisj@rtems.org>
Date:   Wed Oct 1 13:51:05 2025 -0500

    libstdc++: Enable features for RTEMS (based on GCC 15)
    
    libstdc++-v3/ChangeLog:
    
            * configure: Regenerate.
            * configure.ac (newlib, *-rtems*): Add HAVE_SYS_IOCTL_H,
            HAVE_SYS_STAT_H, HAVE_SYS_TYPES_H, HAVE_S_ISREG, HAVE_UNISTD_H,
            HAVE_UNLINKAT, _GLIBCXX_USE_CHMOD, _GLIBCXX_USE_MKDIR,
            _GLIBCXX_USE_CHDIR, _GLIBCXX_USE_GETCWD, _GLIBCXX_USE_UTIME,
            _GLIBCXX_USE_LINK, _GLIBCXX_USE_READLINK, _GLIBCXX_USE_SYMLINK,
            _GLIBCXX_USE_TRUNCATE and _GLIBCXX_USE_FDOPENDIR.

Diff:
---
 libstdc++-v3/configure    | 44 +++++++++++++++++++++++++++++++++++++++++++-
 libstdc++-v3/configure.ac | 21 +++++++++++++++++++++
 2 files changed, 64 insertions(+), 1 deletion(-)

diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 86ec969aaf15..42b638f09fcb 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -28744,6 +28744,14 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
         $as_echo "#define HAVE_LINK 1" >>confdefs.h
 
+        $as_echo "#define HAVE_SYS_IOCT4YL_H 1" >>confdefs.h
+
+        $as_echo "#define HAVE_SYS_STAT_H 1" >>confdefs.h
+
+        $as_echo "#define HAVE_SYS_TYPES_H 1" >>confdefs.h
+
+        $as_echo "#define HAVE_S_ISREG 1" >>confdefs.h
+
         $as_echo "#define HAVE_QUICK_EXIT 1" >>confdefs.h
 
         $as_echo "#define HAVE_READLINK 1" >>confdefs.h
@@ -28758,8 +28766,42 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
         $as_echo "#define HAVE_SYMLINK 1" >>confdefs.h
 
+        $as_echo "#define HAVE_SYS_IOCT4YL_H 1" >>confdefs.h
+
+        $as_echo "#define HAVE_SYS_STAT_H 1" >>confdefs.h
+
+        $as_echo "#define HAVE_SYS_TYPES_H 1" >>confdefs.h
+
+        $as_echo "#define HAVE_S_ISREG 1" >>confdefs.h
+
         $as_echo "#define HAVE_TRUNCATE 1" >>confdefs.h
 
+        $as_echo "#define HAVE_UNISTD_H 1" >>confdefs.h
+
+        $as_echo "#define HAVE_UNLINKAT 1" >>confdefs.h
+
+        $as_echo "#define HAVE_USLEEP 1" >>confdefs.h
+
+        $as_echo "#define _GLIBCXX_USE_CHMOD 1" >>confdefs.h
+
+        $as_echo "#define _GLIBCXX_USE_MKDIR 1" >>confdefs.h
+
+        $as_echo "#define _GLIBCXX_USE_CHDIR 1" >>confdefs.h
+
+        $as_echo "#define _GLIBCXX_USE_GETCWD 1" >>confdefs.h
+
+        $as_echo "#define _GLIBCXX_USE_UTIME 1" >>confdefs.h
+
+        $as_echo "#define _GLIBCXX_USE_LINK 1" >>confdefs.h
+
+        $as_echo "#define _GLIBCXX_USE_READLINK 1" >>confdefs.h
+
+        $as_echo "#define _GLIBCXX_USE_SYMLINK 1" >>confdefs.h
+
+        $as_echo "#define _GLIBCXX_USE_TRUNCATE 1" >>confdefs.h
+
+        $as_echo "#define _GLIBCXX_USE_FDOPENDIR 1" >>confdefs.h
+
         $as_echo "#define HAVE_USLEEP 1" >>confdefs.h
 
 
@@ -53919,7 +53961,7 @@ $as_echo "$glibcxx_cv_libbacktrace_atomics" >&6; }
     CXXFLAGS='-O0 -S'
 
     cat > conftest.$ac_ext << EOF
-#line 53922 "configure"
+#line 53964 "configure"
 #include <stddef.h>
 int main()
 {
diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac
index 47813eb95ca6..b9d49c3e4364 100644
--- a/libstdc++-v3/configure.ac
+++ b/libstdc++-v3/configure.ac
@@ -399,6 +399,10 @@ dnl # rather than hardcoding that information.
         AC_DEFINE(HAVE_ALIGNED_ALLOC)
         AC_DEFINE(HAVE_AT_QUICK_EXIT)
         AC_DEFINE(HAVE_LINK)
+        AC_DEFINE(HAVE_SYS_IOCT4YL_H)
+        AC_DEFINE(HAVE_SYS_STAT_H)
+        AC_DEFINE(HAVE_SYS_TYPES_H)
+        AC_DEFINE(HAVE_S_ISREG)
         AC_DEFINE(HAVE_QUICK_EXIT)
         AC_DEFINE(HAVE_READLINK)
         AC_DEFINE(HAVE_SETENV)
@@ -406,7 +410,24 @@ dnl # rather than hardcoding that information.
         AC_DEFINE(HAVE_SOCKATMARK)
         AC_DEFINE(HAVE_STRERROR_L)
         AC_DEFINE(HAVE_SYMLINK)
+        AC_DEFINE(HAVE_SYS_IOCT4YL_H)
+        AC_DEFINE(HAVE_SYS_STAT_H)
+        AC_DEFINE(HAVE_SYS_TYPES_H)
+        AC_DEFINE(HAVE_S_ISREG)
         AC_DEFINE(HAVE_TRUNCATE)
+        AC_DEFINE(HAVE_UNISTD_H)
+        AC_DEFINE(HAVE_UNLINKAT)
+        AC_DEFINE(HAVE_USLEEP)
+        AC_DEFINE(_GLIBCXX_USE_CHMOD)
+        AC_DEFINE(_GLIBCXX_USE_MKDIR)
+        AC_DEFINE(_GLIBCXX_USE_CHDIR)
+        AC_DEFINE(_GLIBCXX_USE_GETCWD)
+        AC_DEFINE(_GLIBCXX_USE_UTIME)
+        AC_DEFINE(_GLIBCXX_USE_LINK)
+        AC_DEFINE(_GLIBCXX_USE_READLINK)
+        AC_DEFINE(_GLIBCXX_USE_SYMLINK)
+        AC_DEFINE(_GLIBCXX_USE_TRUNCATE)
+        AC_DEFINE(_GLIBCXX_USE_FDOPENDIR)
         AC_DEFINE(HAVE_USLEEP)
 
         # These functions are defined in librtemscpu.  We don't use