On Saturday 2018-04-28 00:29, Yuri Gribov wrote:
>--- a/Make_global.am
>+++ b/Make_global.am
>@@ -5,4 +5,4 @@
> LIBVERSION=2:0:2
>
> AM_CPPFLAGS = -I$(top_srcdir)/include
>-AM_CFLAGS = -Wall
>+AM_CFLAGS = -Wall @VISFLAGS@
Only use @@ in .am files when you must (like, left-hand sides).
Otherwise, just ${VISFLAGS}.
>+dnl Visibility annotations...
>+OLDCFLAGS="$CFLAGS"
>+CFLAGS="$CFLAGS -fvisibility=hidden"
>+VISFLAGS=
>+AC_SUBST(VISFLAGS)
>+AC_MSG_CHECKING(whether compiler supports visibility annotations)
>+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[void
>__attribute__((visibility("default"))) foo() {}]])],
>+ [AC_MSG_RESULT(yes); VISFLAGS='-DNFNL_ENABLE_VISIBILITY'],
>+ AC_MSG_RESULT(no))
>+CFLAGS="$OLDCFLAGS"
>+
>+dnl Version scripts...
>+OLDLDFLAGS="$LDFLAGS"
>+LDFLAGS="$LDFLAGS -Wl,--version-script=$srcdir/nfnl.version"
>+LDSFLAGS=
>+AC_SUBST(LDSFLAGS)
>+AC_MSG_CHECKING(whether linker accepts version scripts)
>+AC_TRY_LINK(,,
>+ [AC_MSG_RESULT(yes);
>LDSFLAGS='-Wl,--version-script=$(top_srcdir)/nfnl.version'];
>+ AC_MSG_RESULT(no))
>+LDFLAGS="$OLDLDFLAGS"
I don't think most of this is needed in practice - just use -fvisibility and
-Wl,-version-script unconditionally from Makefile.am, most of the netfilter
utilities don't work with anything but GNU and Linux.
>@@ -0,0 +1,4 @@
>+{
>+ global: nfnl*; nlif*;
>+ local: *;
>+};
This ought to be
NFNETLINK_1.0.1 {
global: <individual symbol list, no wildcards>...
local: *;
};
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