From 47a42b9c6a523478dc30732a17bc0ac1e02d301d Mon Sep 17 00:00:00 2001
From: Alexey Edelev <alexey.edelev@qt.io>
Date: Wed, 13 Sep 2023 13:33:16 +0200
Subject: [PATCH] Show the allowed values for configure arguments

Just some help to users, so they can spot the allowed values without
looking into docs.

Pick-to: 6.6
Change-Id: I22ad9533104949286de447a05a6e875e8d933bf6
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
---
 cmake/QtProcessConfigureArgs.cmake | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cmake/QtProcessConfigureArgs.cmake b/cmake/QtProcessConfigureArgs.cmake
index f8f6d309810..b5ea3707524 100644
--- a/cmake/QtProcessConfigureArgs.cmake
+++ b/cmake/QtProcessConfigureArgs.cmake
@@ -374,7 +374,9 @@ function(qtConfValidateValue opt val out_var)
     endforeach()
 
     set(${out_var} FALSE PARENT_SCOPE)
-    qtConfAddError("Invalid value '${val}' supplied to command line option '${opt}'.")
+    list(JOIN valid_values " " valid_values_str)
+    qtConfAddError("Invalid value '${val}' supplied to command line option '${opt}'."
+        "\nAllowed values: ${valid_values_str}\n")
 endfunction()
 
 function(qt_commandline_mapped_enum_value opt key out_var)