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macros: add NM_BACKPORT_SYMBOL()

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Add a macro to insert the necessary compiler/linker magic to add a
copy of an existing symbol to an older version. Also, update
check-exports.sh to be able to check for such symbols by listed them
commented-out in the appropriate section.

[thaller@redhat.com: patch modified]

Related: https://bugzilla.gnome.org/show_bug.cgi?id=742993
This commit is contained in:
Dan Winship
2015-01-21 10:01:26 -05:00
committed by Thomas Haller
parent 8a1f4beb65
commit 64ff214bb8
2 changed files with 15 additions and 3 deletions
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14
include/nm-macros-internal.h
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@@ -236,4 +236,18 @@ nm_clear_g_source (guint *id)
/*****************************************************************************/
#define _NM_BACKPORT_SYMBOL_IMPL(VERSION, RETURN_TYPE, ORIG_FUNC, VERSIONED_FUNC, ARGS_TYPED, ARGS) \
RETURN_TYPE VERSIONED_FUNC ARGS_TYPED; \
RETURN_TYPE VERSIONED_FUNC ARGS_TYPED \
{ \
return ORIG_FUNC ARGS; \
} \
RETURN_TYPE ORIG_FUNC ARGS_TYPED; \
__asm__(".symver "G_STRINGIFY(VERSIONED_FUNC)", "G_STRINGIFY(ORIG_FUNC)"@"G_STRINGIFY(VERSION))
#define NM_BACKPORT_SYMBOL(VERSION, RETURN_TYPE, FUNC, ARGS_TYPED, ARGS) \
_NM_BACKPORT_SYMBOL_IMPL(VERSION, RETURN_TYPE, FUNC, _##FUNC##_##VERSION, ARGS_TYPED, ARGS)
/*****************************************************************************/
#endif /* __NM_MACROS_INTERNAL_H__ */