Merge topic 'WriteCompilerDetectionHeader-module'

62a4a67d Add the WriteCompilerDetectionHeader module.

2 files changed, 98 insertions, 0 deletions

diff --git a/Tests/Module/WriteCompilerDetectionHeader/CMakeLists.txt b/Tests/Module/WriteCompilerDetectionHeader/CMakeLists.txt
new file mode 100644
index 0000000..6c5e0be
--- /dev/null
+++ b/Tests/Module/WriteCompilerDetectionHeader/CMakeLists.txt
@@ -0,0 +1,79 @@
+cmake_minimum_required(VERSION 3.0.0)
+project(WriteCompilerDetectionHeader)
+
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+include(WriteCompilerDetectionHeader)
+
+get_property(cxx_known_features GLOBAL PROPERTY CMAKE_CXX_KNOWN_FEATURES)
+
+write_compiler_detection_header(
+  FILE "${CMAKE_CURRENT_BINARY_DIR}/test_compiler_detection.h"
+  PREFIX TEST
+  COMPILERS GNU
+  VERSION 3.1
+  PROLOG "// something"
+  EPILOG "// more"
+  FEATURES
+    ${cxx_known_features}
+)
+
+if (NOT CMAKE_CXX_COMPILE_FEATURES)
+  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/dummy.cpp"
+    "int main(int,char**) { return 0; }\n"
+  )
+  add_executable(WriteCompilerDetectionHeader "${CMAKE_CURRENT_BINARY_DIR}/dummy.cpp")
+
+  include(CheckCXXSourceCompiles)
+  check_cxx_source_compiles("#include \"${CMAKE_CURRENT_BINARY_DIR}/test_compiler_detection.h\"\nint main() { return 0; }\n"
+    file_include_works
+  )
+  if (file_include_works)
+    message(SEND_ERROR "Inclusion of ${CMAKE_CURRENT_BINARY_DIR}/test_compiler_detection.h was expected to cause an error, but did not.")
+  endif()
+  return()
+endif()
+
+macro(set_defines target true_defs false_defs)
+  set(defines)
+  foreach(def ${true_defs})
+    list(APPEND defines ${def}=1)
+  endforeach()
+  foreach(def ${false_defs})
+    list(APPEND defines ${def}=0)
+  endforeach()
+  target_compile_definitions(${target}
+    PRIVATE
+      ${defines}
+  )
+endmacro()
+
+if (CMAKE_CXX_COMPILER_ID STREQUAL GNU)
+  # False for C++98 mode.
+  list(APPEND false_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
+  list(APPEND false_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
+endif()
+
+add_executable(WriteCompilerDetectionHeader main.cpp)
+set_property(TARGET WriteCompilerDetectionHeader PROPERTY CXX_STANDARD 98)
+set_defines(WriteCompilerDetectionHeader "${true_defs}" "${false_defs}")
+
+if(MSVC)
+  return() # MSVC has only one mode.
+endif()
+
+# Since GNU 4.7
+if (";${CMAKE_CXX_COMPILE_FEATURES};" MATCHES ";cxx_delegating_constructors;")
+  list(APPEND true_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
+  list(REMOVE_ITEM false_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
+endif()
+
+# Since GNU 4.4
+if (";${CMAKE_CXX_COMPILE_FEATURES};" MATCHES ";cxx_variadic_templates;")
+  list(APPEND true_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
+  list(REMOVE_ITEM false_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
+endif()
+
+add_executable(WriteCompilerDetectionHeader_11 main.cpp)
+set_property(TARGET WriteCompilerDetectionHeader_11 PROPERTY CXX_STANDARD 11)
+set_defines(WriteCompilerDetectionHeader_11 "${true_defs}" "${false_defs}")
diff --git a/Tests/Module/WriteCompilerDetectionHeader/main.cpp b/Tests/Module/WriteCompilerDetectionHeader/main.cpp
new file mode 100644
index 0000000..8b4ea52
--- /dev/null
+++ b/Tests/Module/WriteCompilerDetectionHeader/main.cpp
@@ -0,0 +1,19 @@
+
+#include "test_compiler_detection.h"
+
+#define JOIN_IMPL(A, B) A ## B
+#define JOIN(A, B) JOIN_IMPL(A, B)
+#define CHECK(FEATURE) (JOIN(TEST_COMPILER_, FEATURE) == JOIN(EXPECTED_COMPILER_, FEATURE))
+
+#if !CHECK(CXX_DELEGATING_CONSTRUCTORS)
+#error cxx_delegating_constructors expected availability did not match.
+#endif
+
+#if !CHECK(CXX_VARIADIC_TEMPLATES)
+#error cxx_variadic_templates expected availability did not match.
+#endif
+
+int main()
+{
+  return 0;
+}