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m4/visibility.m4
 
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# visibility.m4 serial 2 (gettext-0.18)
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dnl Copyright (C) 2005, 2008 Free Software Foundation, Inc.
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dnl Copyright (C) 2009 Monty Taylor
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl Set the variable CFLAG_VISIBILITY.
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dnl Defines and sets the variable HAVE_VISIBILITY.
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AC_DEFUN([PANDORA_CHECK_VISIBILITY],
 
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AC_DEFUN([gl_VISIBILITY],
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[
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  AC_REQUIRE([AC_PROG_CC])
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  CFLAG_VISIBILITY=
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  HAVE_VISIBILITY=0
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  AS_IF([test -n "$GCC"],[
 
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  if test -n "$GCC"; then
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    AC_MSG_CHECKING([for simple visibility declarations])
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    AC_CACHE_VAL([gl_cv_cc_visibility], [
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      gl_save_CFLAGS="$CFLAGS"
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      CFLAGS="$CFLAGS -fvisibility=hidden -Werror"
 
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      CFLAGS="$CFLAGS -fvisibility=hidden"
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      AC_TRY_COMPILE(
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        [extern __attribute__((__visibility__("hidden"))) int hiddenvar;
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         extern __attribute__((__visibility__("default"))) int exportedvar;
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         extern __attribute__((__visibility__("hidden"))) int hiddenfunc (void);
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         extern __attribute__((__visibility__("default"))) int exportedfunc (void);],
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        [],[
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        case "$host_os" in
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          *darwin*)
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            gl_cv_cc_visibility=no
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            ;;
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          *)
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            gl_cv_cc_visibility=yes
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            ;;
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        esac
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        ],[gl_cv_cc_visibility=no])
 
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        [],
 
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        [gl_cv_cc_visibility=yes],
 
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        [gl_cv_cc_visibility=no])
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      CFLAGS="$gl_save_CFLAGS"])
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    AC_MSG_RESULT([$gl_cv_cc_visibility])
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    if test $gl_cv_cc_visibility = yes; then
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      CFLAG_VISIBILITY="-fvisibility=hidden"
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      CXXFLAG_VISIBILITY="-fvisibility=hidden -fvisibility-inlines-hidden"
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      NO_VISIBILITY="-fvisibility=default"
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      HAVE_VISIBILITY=1
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    fi
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  ])
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  AS_IF([test "x$SUNCC" = "xyes"],[
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    CFLAG_VISIBILITY="-xldscope=hidden"
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    CXXFLAG_VISIBILITY="-xldscope=hidden"
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    NO_VISIBILITY="-xldscope=global"
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    HAVE_VISIBILITY=1
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  ])
 
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  fi
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  AC_SUBST([CFLAG_VISIBILITY])
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  AC_SUBST([CXXFLAG_VISIBILITY])
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  AC_SUBST([NO_VISIBILITY])
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  AC_SUBST([HAVE_VISIBILITY])
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  AC_DEFINE_UNQUOTED([HAVE_VISIBILITY], [$HAVE_VISIBILITY],
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    [Define to 1 or 0, depending whether the compiler supports simple visibility declarations.])
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])
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AC_DEFUN([PANDORA_ENABLE_VISIBILITY],[
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  AC_REQUIRE([PANDORA_CHECK_VISIBILITY])
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  AM_CFLAGS="${AM_CFLAGS} ${CFLAG_VISIBILITY}"
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  AM_CXXFLAGS="${AM_CXXFLAGS} ${CXXFLAG_VISIBILITY}"
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])