Autoconf: warn when using stdlib-debug with Qt6

diff --git a/config/qt.m4 b/config/qt.m4
index 814d94d9a6766d25b73be52def818a67b1d8626e..ac8daa255f9131e3a5fc400724892ac507f47313 100644 (file)
--- a/config/qt.m4
+++ b/config/qt.m4
@@ -207,6 +207,14 @@ AC_DEFUN([QT_DO_IT_ALL],
        [AC_MSG_ERROR([LyX requires at least version $1 of Qt. Only version $QTLIB_VERSION has been found.])
        ])
 
+       case $QTLIB_VERSION in
+       6.*) if test $enable_stdlib_debug = "yes" ; then
+                   LYX_WARNING([Compiling LyX with stdlib-debug and Qt6 library may lead to
+   crashes. Consider dropping --enable-stdlib-debug.])
+            fi;;
+       esac
+
+
        save_CPPFLAGS=$CPPFLAGS
        CPPFLAGS="$save_CPPFLAGS $QT_CORE_INCLUDES"
        AC_CHECK_HEADER(QtGui/qtgui-config.h,