projects/sample/autoconf/m4/visibility_inlines_hidden.m4

   1 #
   2 # Determine if the compiler accepts -fvisibility-inlines-hidden
   3 #
   4 # This macro is specific to LLVM.
   5 #
   6 AC_DEFUN([AC_CXX_USE_VISIBILITY_INLINES_HIDDEN],
   7 [AC_CACHE_CHECK([for compiler -fvisibility-inlines-hidden option],
   8                 [llvm_cv_cxx_visibility_inlines_hidden],
   9 [ AC_LANG_PUSH([C++])
  10   oldcxxflags="$CXXFLAGS"
  11   CXXFLAGS="$CXXFLAGS -O0 -fvisibility-inlines-hidden -Werror"
  12   AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
  13     [template <typename T> struct X { void __attribute__((noinline)) f() {} };],
  14     [X<int>().f();])],
  15     [llvm_cv_cxx_visibility_inlines_hidden=yes],[llvm_cv_cxx_visibility_inlines_hidden=no])
  16   CXXFLAGS="$oldcxxflags"
  17   AC_LANG_POP([C++])
  18 ])
  19 if test "$llvm_cv_cxx_visibility_inlines_hidden" = yes ; then
  20   AC_SUBST([ENABLE_VISIBILITY_INLINES_HIDDEN],[1])
  21 else
  22   AC_SUBST([ENABLE_VISIBILITY_INLINES_HIDDEN],[0])
  23 fi
  24 ])