1# Check if __attribute__((unused)) is supported
2# Stolen from dune-common (thanks)
3
4AC_DEFUN([ALBERTA_CHECK_UNUSED],[
5    AC_CACHE_CHECK([for __attribute__((unused))], dune_cv_attribute_unused, [
6        AC_LANG_PUSH([C++])
7        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
8                        #define UNUSED __attribute__((unused))
9                        void f(int a UNUSED, int UNUSED)
10                        {
11                          int UNUSED b;
12                        }
13                          ]],
14                          [])],
15                        dune_cv_attribute_unused="yes",
16                        dune_cv_attribute_unused="no")
17        AC_LANG_POP([C++])
18    ])
19
20    AS_IF([test "x$dune_cv_attribute_unused" = "xyes"],
21      [AC_DEFINE_UNQUOTED(HAS_ATTRIBUTE_UNUSED,
22                          1,
23                          [does the compiler support __attribute__((unused))?])],)
24])
25