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m4/pandora_visibility.m4
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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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        [gl_cv_cc_visibility=yes],
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        [gl_cv_cc_visibility=no])
 
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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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      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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  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], [$HAVE_VISIBILITY],
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AC_DEFUN([PANDORA_ENABLE_VISIBILITY],[
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  AC_REQUIRE([PANDORA_CHECK_VISIBILITY])
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  AM_CFLAGS="${AM_CFLAGS} ${CFLAG_VISIBILITY}"
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  AM_CXXFLAGS="${AM_CXXFLAGS} ${CFLAG_VISIBILITY}"
 
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  AM_CXXFLAGS="${AM_CXXFLAGS} ${CXXFLAG_VISIBILITY}"
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])