Silence warnings about scanner.cpp

This file is generated, so it is awkward to suppress inline.
So we suppress on the compiler command line, and test to
make sure that will work cleanly.

Change-Id: I8d7b78d71f13fb91b900ff994e319f6360a4bb86

diff --git a/src/gromacs/CMakeLists.txt b/src/gromacs/CMakeLists.txt
index 3b40dbc374d1653514512b6ae5f59155d09d6f96..d0ee4bbfeb564579341cfb6b0c0bfba68bb9d835 100644 (file)
--- a/src/gromacs/CMakeLists.txt
+++ b/src/gromacs/CMakeLists.txt
@@ -106,6 +106,23 @@ if (GMX_GIT_VERSION_INFO)
     add_dependencies(libgromacs gmx-version)
 endif ()
 
+# Recent versions of gcc and clang give warnings on scanner.cpp, which
+# is a generated source file. These are awkward to suppress inline, so
+# we do it in the compilation command (after testing that the compiler
+# supports the suppressions). Setting the properties only works after
+# the related target has been created, e.g. after when the file is
+# used with add_library().
+include(CheckCXXCompilerFlag)
+check_cxx_compiler_flag(-Wno-unused-parameter HAS_NO_UNUSED_PARAMETER)
+check_cxx_compiler_flag(-Wno-deprecated-register HAS_NO_DEPRECATED_REGISTER)
+if (HAS_NO_UNUSED_PARAMETER)
+    set(_scanner_cpp_compiler_flags "${_scanner_cpp_compiler_flags} -Wno-unused-parameter")
+endif()
+if (HAS_NO_DEPRECATED_REGISTER)
+    set(_scanner_cpp_compiler_flags "${_scanner_cpp_compiler_flags} -Wno-deprecated-register")
+endif()
+set_source_files_properties(selection/scanner.cpp PROPERTIES COMPILE_FLAGS "${_scanner_cpp_compiler_flags}")
+
 if(GMX_BUILD_OWN_FFTW)
     # Only needed for cmake 2.8.7, otherwise this should be automatic
     # This dependency has to be made here rather than the CMakeLists.txt that