m4/rw_prog_cxx_works.m4

   1 # rw_PROG_CXX_WORKS
   2 #
   3 # Check whether the C++ compiler works. There's a bit of oversight in
   4 # autoconf that will set the C++ compiler to g++ if no compiler is found,
   5 # even if g++ is not present! So we need an extra test to make sure that
   6 # the compiler works.
   7 # Script copied from the lttng-ust project.
   8 #
   9 AC_DEFUN([rw_PROG_CXX_WORKS], [
  10 AC_REQUIRE([AC_PROG_CXX])
  11 AC_CACHE_CHECK([whether the C++ compiler works],
  12    [rw_cv_prog_cxx_works],
  13    [AC_LANG_PUSH([C++])
  14
  15    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [
  16        check_cxx_designated_initializers=yes
  17    ], [
  18        rw_cv_prog_cxx_works=no
  19    ])
  20
  21    AS_IF([test "x$check_cxx_designated_initializers" = "xyes"], [
  22        AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
  23            struct foo { int a; int b; };
  24            void fct(void)
  25            {
  26                struct foo f = { .a = 0, .b = 1 };
  27            }
  28        ]])], [
  29            rw_cv_prog_cxx_works=yes
  30        ], [
  31            rw_cv_prog_cxx_works=no
  32        ])
  33    ])
  34
  35    AC_LANG_POP([C++])
  36 ])
  37 ])