From 8e196c9e39e83084d45d206f51188399d9e6b953 Mon Sep 17 00:00:00 2001
From: Marco Bubke <marco.bubke@qt.io>
Date: Fri, 21 Feb 2025 10:51:17 +0100
Subject: [PATCH] Increase concept diagnostic depth to 8

Reading concept errors is sometimes quite hard because they say that the
constraint was failing but not why. With a deeper diagnostic stack, it
is easier to understand why it was failing.

Change-Id: I863a23457bea390f50f9c458b5e82a24e17a26ea
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
---
 cmake/QtCreatorAPI.cmake         | 6 ++++++
 cmake/QtCreatorAPIInternal.cmake | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/cmake/QtCreatorAPI.cmake b/cmake/QtCreatorAPI.cmake
index 4dea5d3a24e..9573ffeed28 100644
--- a/cmake/QtCreatorAPI.cmake
+++ b/cmake/QtCreatorAPI.cmake
@@ -314,6 +314,8 @@ function(add_qtc_library name)
     qtc_enable_sanitize("${name}" ${SANITIZE_FLAGS})
   endif()
 
+  qtc_deeper_concept_diagnostic_depth("${name}")
+
   if (NAMELINK_OPTION AND NOT QTC_STATIC_BUILD)
     install(TARGETS ${name}
       LIBRARY
@@ -534,6 +536,8 @@ function(add_qtc_plugin target_name)
     qtc_enable_sanitize("${name}" ${SANITIZE_FLAGS})
   endif()
 
+  qtc_deeper_concept_diagnostic_depth("${name}")
+
   extend_qtc_target(${target_name}
     INCLUDES ${_arg_INCLUDES}
     SYSTEM_INCLUDES ${_arg_SYSTEM_INCLUDES}
@@ -762,6 +766,8 @@ function(add_qtc_executable name)
     qtc_enable_sanitize("${name}" ${SANITIZE_FLAGS})
   endif()
 
+  qtc_deeper_concept_diagnostic_depth("${name}")
+
   extend_qtc_target("${name}"
     INCLUDES "${CMAKE_BINARY_DIR}/src" ${_arg_INCLUDES}
     DEFINES ${default_defines_copy} ${TEST_DEFINES} ${_arg_DEFINES}
diff --git a/cmake/QtCreatorAPIInternal.cmake b/cmake/QtCreatorAPIInternal.cmake
index 65533395bf4..37e0f017b3d 100644
--- a/cmake/QtCreatorAPIInternal.cmake
+++ b/cmake/QtCreatorAPIInternal.cmake
@@ -195,6 +195,12 @@ function(qtc_enable_sanitize _target _sanitize_flags)
   endif()
 endfunction()
 
+function(qtc_deeper_concept_diagnostic_depth _target)
+  if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    target_compile_options("${_target}" PUBLIC -fconcepts-diagnostics-depth=8)
+  endif()
+endfunction()
+
 function(qtc_add_link_flags_no_undefined target)
   # needs CheckLinkerFlags
   if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.18 AND NOT MSVC AND NOT APPLE)