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   1 dnl Detection and configuration of the visibility feature of gcc
   2 dnl Vincent Torri 2006-02-11
   3 dnl
   4 dnl GCC_CHECK_VISIBILITY([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
   5 dnl Check the visibility feature of gcc
   6 dnl
   7 AC_DEFUN([GCC_CHECK_VISIBILITY],
   8    [AC_MSG_CHECKING([whether ${CC} supports visibility feature])
   9     save_CFLAGS=${CFLAGS}
  10     CFLAGS="$CFLAGS -fvisibility=hidden -fvisibility-inlines-hidden"
  11     AC_COMPILE_IFELSE(
  12        [AC_LANG_PROGRAM(
  13           [[
  14 #pragma GCC visibility push(hidden)
  15 extern void f(int);
  16 #pragma GCC visibility pop
  17           ]],
  18           [[]]
  19         )],
  20        [AC_DEFINE(
  21            GCC_HAS_VISIBILITY,
  22            [],
  23            [Defined if GCC supports the vilibility feature])
  24         m4_if([$1], [], [:], [$1])
  25         AC_MSG_RESULT(yes)],
  26        [m4_if([$2], [], [:], [$2])
  27         AC_MSG_RESULT(no)])
  28     CFLAGS=${save_CFLAGS}
  29    ])