Add cmake file and factor common parts

common parts between C/gcc-c-torture/CMakeLists.txt and the new
C/gcc-dg/CMakeLists.txt are put in DgOptions.txt

SingleSource/Regression/C/gcc-c-torture/CMakeLists.txt

@@ -1,64 +1,5 @@
-# The following cause errors if they are passed to clang via CFLAGS
-set(CLANG_ERRORING_CFLAGS
-  "-fno-early-inlining"
-  "-fno-ira-share-spill-slots"
-  "-ftree-loop-distribution"
-  "-fno-tree-bit-ccp"
-  "-fno-tree-coalesce-vars"
-)
-
-# This pulls out options in dg-options into `${Variable}`
-function(gcc_torture_dg_options_cflags Variable File)
-  # Some files have dg-options which we need to pick up. These should be in
-  # the first line but often aren't.
-  #
-  # We also need to be careful not to pick up target-specific dg-options.
-  set(DG_CFLAGS)
-
-  file(STRINGS ${File} FileLines)
-  foreach(FileLine ${FileLines})
-    # Looking for `dg-options "..."` or `dg-additional-options "..."` without
-    # `{ target` afterwards (ignoring spaces).
-    if(FileLine MATCHES "dg-(additional-)?options ({ )?\"([^\"]*)\"( })?(.*)")
-      # This is needed to turn the string into a list of CFLAGS
-      separate_arguments(FILE_CFLAGS UNIX_COMMAND ${CMAKE_MATCH_3})
-      # This does the negative lookahead for `{ target` anywhere in the rest of
-      # the line
-      if(NOT ${CMAKE_MATCH_5} MATCHES "{ +target")
-        list(APPEND DG_CFLAGS ${FILE_CFLAGS})
-      endif()
-    endif()
-  endforeach()
-
-  # Remove any flags that will make clang error
-  if (DG_CFLAGS)
-    list(REMOVE_ITEM DG_CFLAGS ${CLANG_ERRORING_CFLAGS})
-  endif()
-
-  # Set the parent scope variable
-  set(${Variable} ${DG_CFLAGS} PARENT_SCOPE)
-endfunction()
-
-function(gcc_torture_execute_test File)
-  cmake_parse_arguments(_TORTURE "" "PREFIX" "CFLAGS;LDFLAGS" ${ARGN})
-  # There are a few tests with duplicate filenames, and CMake wants all target
-  # names to be unique, so we add a disambiguator to the target name. The
-  # disambiguator is based upon the directory structure, swapping `/` for `-`.
-  get_filename_component(Name ${File} NAME_WE)
-  set(_target "${_TORTURE_PREFIX}-${Name}")
-
-  gcc_torture_dg_options_cflags(DG_CFLAGS ${File})
-
-  # Add any flags that were requested
-  list(APPEND CFLAGS ${DG_CFLAGS} ${_TORTURE_CFLAGS})
-  list(APPEND LDFLAGS ${_TORTURE_LDFLAGS})
-
-  llvm_test_executable_no_test(${_target} ${File})
-  llvm_test_run()
-
-  llvm_add_test_for_target(${_target})
-endfunction()
+include(${CMAKE_CURRENT_SOURCE_DIR}/../../DgOptions.txt)
 
 file(COPY lit.local.cfg DESTINATION "${CMAKE_CURRENT_BINARY_DIR}")
 
-add_subdirectory(execute)
+add_subdirectory(execute)

SingleSource/Regression/C/gcc-c-torture/execute/CMakeLists.txt

@@ -1,8 +1,5 @@
 add_subdirectory(ieee)
 
-# GCC C Torture Suite is conventionally run without warnings
-list(APPEND CFLAGS -Wno-implicit-int -Wno-int-conversion -Wno-implicit-function-declaration -w)
-
 set(TestsToSkip)
 
 ##