From 42d831af67380384d5a77d23f0ade470b2f8f5c5 Mon Sep 17 00:00:00 2001
From: Matthias Maier <tamiko@43-1.org>
Date: Sun, 2 Jul 2023 22:24:35 -0500
Subject: [PATCH] Bugfix: do not invoke diff during configure

Instead, update the deal_ii_add_test() macro to allow defining a test
with generated source files.
---
 cmake/macros/macro_deal_ii_add_test.cmake | 22 +++++++++++++++-------
 tests/examples/CMakeLists.txt.in          |  4 ----
 2 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/cmake/macros/macro_deal_ii_add_test.cmake b/cmake/macros/macro_deal_ii_add_test.cmake
index f7f7e6d1cc..02b525109f 100644
--- a/cmake/macros/macro_deal_ii_add_test.cmake
+++ b/cmake/macros/macro_deal_ii_add_test.cmake
@@ -289,13 +289,21 @@ function(deal_ii_add_test _category _test_name _comparison_file)
   list(LENGTH _source_file _number)
   if(NOT _number EQUAL 1)
     if(_number EQUAL 0)
-      message(FATAL_ERROR "\n${_comparison_file}:\n"
-        "A comparison file (ending in .output or .run-only) has been "
-        "picked up but no suitable source file or parameter file was "
-        "found. Please provide exactly one of the following.\n"
-        "A source file \"${CMAKE_CURRENT_SOURCE_DIR}/${_test_name}.c[cu]\",\n"
-        "or a parameter file \"${CMAKE_CURRENT_SOURCE_DIR}/${_test_name}.(prm|json)[.in]\".\n"
-        )
+      #
+      # None of the candidates above exist. Check whether a
+      # ${_test_name}.cc file gets generated during the build process:
+      set(_source_file "${CMAKE_CURRENT_SOURCE_DIR}/${_test_name}.cc")
+      get_property(_generated SOURCE "${_source_file}" PROPERTY GENERATED)
+      if(NOT ${_generated})
+        message(FATAL_ERROR "\n${_comparison_file}:\n"
+          "A comparison file (ending in .output or .run-only) has been "
+          "picked up but no suitable source file, generated source file, or "
+          "parameter file was found. Please provide exactly one of the following.\n"
+          "A source file \"${CMAKE_CURRENT_SOURCE_DIR}/${_test_name}.c[cu]\",\n"
+          "or a parameter file \"${CMAKE_CURRENT_SOURCE_DIR}/${_test_name}.(prm|json)[.in]\".\n"
+          )
+      endif()
+
     else()
       string(REPLACE ";" "\n" _source_file "${_source_file}")
       message(FATAL_ERROR "\n${_comparison_file}:\n"
diff --git a/tests/examples/CMakeLists.txt.in b/tests/examples/CMakeLists.txt.in
index 1bc0c80d00..bafa43e7b8 100644
--- a/tests/examples/CMakeLists.txt.in
+++ b/tests/examples/CMakeLists.txt.in
@@ -20,10 +20,6 @@ foreach(_diff_file ${_diff_files})
     COMMENT "Patching ${_output_file}"
     )
 
-  execute_process(
-    COMMAND patch ${_source_file} ${_diff_file} -o ${_output_file}
-    )
-
   # Create symbolic links to the output files:
   file(GLOB _output_files "${_base_directory}/${_step}*.output*")
   foreach(_file ${_output_files})
-- 
2.39.5