RTEMS Source Builder | Add std::filesystem cddir and mkdir support to libstdc++v3 (#46)

[Sebastian Huber (@sebhub)]

Sebastian Huber commented: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/issues/46#note_114840


The right place is probably:
```
diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac
index e59bcdb2944..79512a398c2 100644
--- a/libstdc++-v3/configure.ac
+++ b/libstdc++-v3/configure.ac
@@ -353,6 +353,31 @@ else
 
     AC_DEFINE(HAVE_ICONV)
     AC_DEFINE(HAVE_MEMALIGN)
+
+    case "${target}" in
+      *-rtems*)
+        case "${target}" in
+          bfin* | lm32* | mips* | moxie* | or1k* | v850*)
+            ;;
+          *)
+            AC_DEFINE(HAVE_TLS)
+            ;;
+        esac
+        AC_DEFINE(HAVE_ALIGNED_ALLOC)
+        AC_DEFINE(HAVE_AT_QUICK_EXIT)
+        AC_DEFINE(HAVE_LINK)
+        AC_DEFINE(HAVE_POLL)
+        AC_DEFINE(HAVE_QUICK_EXIT)
+        AC_DEFINE(HAVE_READLINK)
+        AC_DEFINE(HAVE_SETENV)
+        AC_DEFINE(HAVE_SLEEP)
+        AC_DEFINE(HAVE_SOCKATMARK)
+        AC_DEFINE(HAVE_STRERROR_L)
+        AC_DEFINE(HAVE_SYMLINK)
+        AC_DEFINE(HAVE_TRUNCATE)
+        AC_DEFINE(HAVE_USLEEP)
+        ;;
+    esac
   elif test "x$with_headers" != "xno"; then
     GLIBCXX_CROSSCONFIG
   fi
```
See
```
commit e0466d32eb3422e6d206a16845e4e594d3a0f2b2
Author: Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:   Wed Jun 8 08:44:36 2022 +0200

    Enable some features for RTEMS in libstdc++
    
    Remove RTEMS support from crossconfig.m4 since this code is not used due to
    "with_newlib" being "yes".
    
    libstdc++-v3/ChangeLog:
    
            * configure: Regnerate.
            * configure.ac (newlib, *-rtems*): Enable TLS support for all RTEMS
            targets except bfin, lm32, mips, moxie, or1k, and v850.
            For all RTEMS targets, define HAVE_ALIGNED_ALLOC, HAVE_AT_QUICK_EXIT,
            HAVE_LINK, HAVE_POLL, HAVE_QUICK_EXIT, HAVE_READLINK, HAVE_SETENV,
            HAVE_SLEEP, HAVE_SOCKATMARK, HAVE_STRERROR_L, HAVE_SYMLINK,
            HAVE_TRUNCATE, and HAVE_USLEEP.
            * crossconfig.m4 (*-rtems*): Remove.
```

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/issues/46#note_114840
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