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1dnl @synopsis CHECK_VISIBILITY([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
2dnl
3dnl @summary check for the gcc -fvisibility flag
4dnl
5
6AC_DEFUN([CHECK_VISIBILITY_HIDDEN], [
7  save_CFLAGS="$CFLAGS"
8  VISIBILITY_HIDDEN_CFLAGS=""
9  OPTION=-fvisibility=hidden
10
11  AC_MSG_CHECKING(for gcc $OPTION support)
12
13  CFLAGS="$CFLAGS $OPTION"
14
15  AC_TRY_COMPILE([
16      int default_vis __attribute__ ((visibility("default")));
17      int hidden_vis __attribute__ ((visibility("hidden")));
18    ],
19    [],
20    ac_visibility_supported=yes,
21    ac_visibility_supported=no)
22  AC_MSG_RESULT($ac_visibility_supported)
23
24  if test x"$ac_visibility_supported" = xyes; then
25    ifelse([$1],,AC_DEFINE(HAVE_GCC_VISIBILITY,1,[Define if you have gcc -fvisibility=hidden support ]),[$1])
26    VISIBILITY_HIDDEN_CFLAGS="$OPTION -DHAVE_VISIBILITY_HIDDEN"
27    AC_DEFINE(HAVE_VISIBILITY_HIDDEN,[],[Support for visibility hidden])
28  else
29    $2
30    :
31  fi
32
33  AC_SUBST(VISIBILITY_HIDDEN_CFLAGS)
34
35  CFLAGS="$save_CFLAGS"
36])
37