efl/legacy/evas/m4/efl_attribute.m4

dnl Copyright (C) 2011 Vincent Torri <vtorri at univ-evry dot fr>
dnl That code is public domain and can be freely used or copied.

dnl Macros for checking if the compiler supports some __attribute__ uses

dnl Usage: EFL_ATTRIBUTE_UNUSED
dnl call AC_DEFINE for __UNUSED__ if __attribute__((unused)) is available

AC_DEFUN([EFL_ATTRIBUTE_UNUSED],
[
AC_MSG_CHECKING([for __attribute__ ((unused))])
AC_COMPILE_IFELSE(
   [AC_LANG_PROGRAM(
       [[
       ]],
       [[
void foo(int x __attribute__ ((unused))) {}
       ]])],
   [have_attribute_unused="yes"],
   [have_attribute_unused="no"])
AC_MSG_RESULT([${have_attribute_unused}])

if test "x${have_attribute_unused}" = "xyes" ; then
   AC_DEFINE([__UNUSED__], [__attribute__ ((unused))], [Macro declaring a function argument to be unused.])
fi
])

dnl Usage: EFL_ATTRIBUTE_VECTOR
dnl call AC_DEFINE for HAVE_GCC_ATTRIBUTE_VECTOR if __attribute__((vector)) is available

AC_DEFUN([EFL_ATTRIBUTE_VECTOR],
[
AC_MSG_CHECKING([for __attribute__ ((vector))])
AC_COMPILE_IFELSE(
   [AC_LANG_PROGRAM(
       [[
typedef int v4si __attribute__ ((vector_size (16)));
       ]],
       [[
if (sizeof(v4si) == 16)
  return 0;
else
  return -1;
       ]])],
   [have_attribute_vector="yes"],
   [have_attribute_vector="no"])
AC_MSG_RESULT([${have_attribute_vector}])

if test "x${have_attribute_vector}" = "xyes" ; then
   AC_DEFINE([HAVE_GCC_ATTRIBUTE_VECTOR], [1], [Define to 1 if your compiler supports __attribute__ ((vector)).])
fi
])

dnl Usage: EFL_ATTRIBUTE_ALWAYS_INLINE
dnl call AC_DEFINE for alway_inline if __attribute__((always_inline)) is available

AC_DEFUN([EFL_ATTRIBUTE_ALWAYS_INLINE],
[
AC_MSG_CHECKING([for __attribute__ ((always_inline))])
AC_COMPILE_IFELSE(
   [AC_LANG_PROGRAM(
       [[
       ]],
       [[
__attribute__((always_inline)) void foo(void) {}
       ]])],
   [have_attribute_always_inline="yes"],
   [have_attribute_always_inline="no"])
AC_MSG_RESULT([${have_attribute_always_inline}])

if test "x${have_attribute_always_inline}" = "xyes" ; then
   AC_DEFINE([always_inline], [__attribute__ ((always_inline)) inline], [Macro declaring a function to always be inlined.])
else
   AC_DEFINE([always_inline], [inline], [Macro declaring a function to always be inlined.])
fi
])

dnl End of efl_attribute.m4