[3.9] bpo-43667: Fix broken Unicode encoding in non-UTF locales on Solaris (GH-25096) (GH-25847)

(cherry picked from commit 9032cf5cb1e33c0349089cfb0f6bf11ed3c30e86)

Co-authored-by: Jakub Kulík <Kulikjak@gmail.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/configure b/configure
index 8dcdbf1..c584866 100755
--- a/configure
+++ b/configure
@@ -15123,6 +15123,22 @@ else
 $as_echo "no" >&6; }
 fi
 
+case $ac_sys_system/$ac_sys_release in
+SunOS/*)
+  if test -f /etc/os-release; then
+    OS_NAME=$(awk -F= '/^NAME=/ {print substr($2,2,length($2)-2)}' /etc/os-release)
+    if test "x$OS_NAME" = "xOracle Solaris"; then
+      # bpo-43667: In Oracle Solaris, the internal form of wchar_t in
+      # non-Unicode locales is not Unicode and hence cannot be used directly.
+      # https://docs.oracle.com/cd/E37838_01/html/E61053/gmwke.html
+
+$as_echo "#define HAVE_NON_UNICODE_WCHAR_T_REPRESENTATION 1" >>confdefs.h
+
+    fi
+  fi
+  ;;
+esac
+
 # check for endianness
  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether byte ordering is bigendian" >&5
 $as_echo_n "checking whether byte ordering is bigendian... " >&6; }