m4/fp_visibility_hidden.m4

   1 # FP_VISIBILITY_HIDDEN
   2 # ----------------------------------
   3 # Is the visibility hidden attribute supported?
   4 AC_DEFUN([FP_VISIBILITY_HIDDEN],
   5 [
   6     AC_MSG_CHECKING([whether __attribute__((visibility("hidden"))) is supported])
   7     echo '__attribute__((visibility("hidden"))) void foo(void) {}' > conftest.c
   8     if $CC -Wall -Werror -c conftest.c > /dev/null 2>&1
   9     then
  10         AC_MSG_RESULT([yes])
  11         AC_DEFINE(HAS_VISIBILITY_HIDDEN, 1, [Has visibility hidden])
  12     else
  13         AC_MSG_RESULT([no])
  14     fi
  15     rm -f conftest.c conftest.o
  16 ])