From 29e2b8517126389b2c4b2f3479c4634a8260bea3 Mon Sep 17 00:00:00 2001
From: Raul Tambre <raul@tambre.ee>
Date: Thu, 12 Aug 2021 17:53:29 +0300
Subject: Tests: Simplify RunCMake.CompileFeatures introspection

---
 Tests/RunCMake/CMakeLists.txt                      |  2 +-
 Tests/RunCMake/CompileFeatures/RunCMakeTest.cmake  | 19 ++--------
 .../CompileFeatures/compiler_introspection.cmake   | 20 ++++++++++
 .../CompileFeatures/generate_feature_list.cmake    | 43 ----------------------
 4 files changed, 24 insertions(+), 60 deletions(-)
 create mode 100644 Tests/RunCMake/CompileFeatures/compiler_introspection.cmake
 delete mode 100644 Tests/RunCMake/CompileFeatures/generate_feature_list.cmake

diff --git a/Tests/RunCMake/CMakeLists.txt b/Tests/RunCMake/CMakeLists.txt
index eb2c2d94ae..af6cbb5642 100644
--- a/Tests/RunCMake/CMakeLists.txt
+++ b/Tests/RunCMake/CMakeLists.txt
@@ -310,7 +310,7 @@ add_RunCMake_test(TargetProperties)
 add_RunCMake_test(ToolchainFile)
 add_RunCMake_test(find_dependency)
 add_RunCMake_test(CompileDefinitions)
-add_RunCMake_test(CompileFeatures)
+add_RunCMake_test(CompileFeatures -DCMake_NO_C_STANDARD=${CMake_NO_C_STANDARD} -DCMake_NO_CXX_STANDARD=${CMake_NO_CXX_STANDARD})
 add_RunCMake_test(Policy)
 add_RunCMake_test(PolicyScope)
 add_RunCMake_test(WriteBasicConfigVersionFile)
diff --git a/Tests/RunCMake/CompileFeatures/RunCMakeTest.cmake b/Tests/RunCMake/CompileFeatures/RunCMakeTest.cmake
index 5a70da2fa3..934d8ca878 100644
--- a/Tests/RunCMake/CompileFeatures/RunCMakeTest.cmake
+++ b/Tests/RunCMake/CompileFeatures/RunCMakeTest.cmake
@@ -9,17 +9,8 @@ run_cmake(NotAFeature_OriginDebugGenex)
 run_cmake(NotAFeature_OriginDebugTransitive)
 run_cmake(NotAFeature_OriginDebugCommand)
 
-run_cmake(generate_feature_list)
-file(READ
-  "${RunCMake_BINARY_DIR}/generate_feature_list-build/c_features.txt"
-  C_FEATURES
-)
-file(READ
-  "${RunCMake_BINARY_DIR}/generate_feature_list-build/cxx_features.txt"
-  CXX_FEATURES
-)
-include("${RunCMake_BINARY_DIR}/generate_feature_list-build/c_standard_default.cmake")
-include("${RunCMake_BINARY_DIR}/generate_feature_list-build/cxx_standard_default.cmake")
+run_cmake(compiler_introspection)
+include("${RunCMake_BINARY_DIR}/compiler_introspection-build/info.cmake")
 
 if (NOT C_FEATURES)
   run_cmake(NoSupportedCFeatures)
@@ -47,15 +38,11 @@ if(CXX_STANDARD_DEFAULT)
   run_cmake(NotAStandard)
 
   foreach(standard 98 11)
-    file(READ
-      "${RunCMake_BINARY_DIR}/generate_feature_list-build/cxx${standard}_flag.txt"
-      CXX${standard}_FLAG
-    )
     if (CXX${standard}_FLAG STREQUAL NOTFOUND)
       run_cmake(RequireCXX${standard})
       run_cmake(RequireCXX${standard}Variable)
     endif()
-    if (CXX${standard}EXT_FLAG STREQUAL NOTFOUND)
+    if (CXX${standard}_EXT_FLAG STREQUAL NOTFOUND)
       run_cmake(RequireCXX${standard}Ext)
       run_cmake(RequireCXX${standard}ExtVariable)
     endif()
diff --git a/Tests/RunCMake/CompileFeatures/compiler_introspection.cmake b/Tests/RunCMake/CompileFeatures/compiler_introspection.cmake
new file mode 100644
index 0000000000..c42324b9dd
--- /dev/null
+++ b/Tests/RunCMake/CompileFeatures/compiler_introspection.cmake
@@ -0,0 +1,20 @@
+enable_language(C CXX)
+
+macro(info lang)
+  string(APPEND info "\
+set(${lang}_STANDARD_DEFAULT ${CMAKE_${lang}_STANDARD_DEFAULT})
+set(${lang}_EXTENSIONS_DEFAULT ${CMAKE_${lang}_EXTENSIONS_DEFAULT})
+set(${lang}_FEATURES ${CMAKE_${lang}_COMPILE_FEATURES})
+")
+
+  foreach(standard ${ARGN})
+    string(APPEND info "\
+set(${lang}${standard}_FLAG ${CMAKE_${lang}${standard}_STANDARD_COMPILE_OPTION})
+set(${lang}${standard}_EXT_FLAG ${CMAKE_${lang}${standard}_EXTENSION_COMPILE_OPTION})
+")
+  endforeach()
+endmacro()
+
+info(C 90 99 11 17 23)
+info(CXX 98 11 14 17 20 23)
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/info.cmake" "${info}")
diff --git a/Tests/RunCMake/CompileFeatures/generate_feature_list.cmake b/Tests/RunCMake/CompileFeatures/generate_feature_list.cmake
deleted file mode 100644
index 5c58052b81..0000000000
--- a/Tests/RunCMake/CompileFeatures/generate_feature_list.cmake
+++ /dev/null
@@ -1,43 +0,0 @@
-
-enable_language(C)
-
-file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/c_features.txt"
-  "${CMAKE_C_COMPILE_FEATURES}"
-)
-
-file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/cxx_features.txt"
-  "${CMAKE_CXX_COMPILE_FEATURES}"
-)
-
-if(DEFINED CMAKE_C_STANDARD_DEFAULT)
-  set(c_standard_default_code "set(C_STANDARD_DEFAULT \"${CMAKE_C_STANDARD_DEFAULT}\")\n")
-else()
-  set(c_standard_default_code "unset(C_STANDARD_DEFAULT)\n")
-endif()
-file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/c_standard_default.cmake" "${c_standard_default_code}")
-
-if(DEFINED CMAKE_CXX_STANDARD_DEFAULT)
-  set(cxx_standard_default_code "set(CXX_STANDARD_DEFAULT \"${CMAKE_CXX_STANDARD_DEFAULT}\")\n")
-else()
-  set(cxx_standard_default_code "unset(CXX_STANDARD_DEFAULT)\n")
-endif()
-file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/cxx_standard_default.cmake" "${cxx_standard_default_code}")
-
-foreach(standard 98 11)
-  set(CXX${standard}_FLAG NOTFOUND)
-  if (DEFINED CMAKE_CXX${standard}_STANDARD_COMPILE_OPTION)
-    set(CXX${standard}_FLAG ${CMAKE_CXX${standard}_STANDARD_COMPILE_OPTION})
-  endif()
-
-  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/cxx${standard}_flag.txt"
-    "${CXX${standard}_FLAG}"
-  )
-  set(CXX${standard}EXT_FLAG NOTFOUND)
-  if (DEFINED CMAKE_CXX${standard}_EXTENSION_COMPILE_OPTION)
-    set(CXX${standard}EXT_FLAG ${CMAKE_CXX${standard}_EXTENSION_COMPILE_OPTION})
-  endif()
-
-  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/cxx${standard}ext_flag.txt"
-    "${CXX${standard}EXT_FLAG}"
-  )
-endforeach()
-- 
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