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Fix crashes on other platforms caused by interference from Darwin weak symbol support.

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Support weak symbols on a platform specific basis.  The Mac OS X (Darwin)
support must be isolated from the other platforms because it has caused
other platforms to crash.  Several other platforms including Linux have
GCC versions that define the weak attribute.  However, this attribute is
only setup for use in the code by Darwin.

(closes issue ASTERISK-18728)
Reported by: Ben Klang

Review: https://reviewboard.asterisk.org/r/1617/
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Merged revisions 348647 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 348648 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@348649 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett
2011-12-19 21:43:19 +00:00
parent eb37d38b7d
commit 38e4643cb4
2 changed files with 177 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
configure.ac
View File

@@ -898,9 +898,37 @@ AST_GCC_ATTRIBUTE(always_inline)
AST_GCC_ATTRIBUTE(deprecated)
AST_GCC_ATTRIBUTE(sentinel)
AST_GCC_ATTRIBUTE(warn_unused_result)
AST_GCC_ATTRIBUTE(weak_import, [], [], PBX_WEAKREF)
AST_GCC_ATTRIBUTE(weak, [], [], PBX_WEAKREF)
AST_GCC_ATTRIBUTE(weakref, [weakref("foo")], static, PBX_WEAKREF)
# Support weak symbols on a platform specific basis. The Mac OS X
# (Darwin) support must be isolated from the other platforms because
# it has caused other platforms to fail.
#
case "${OSARCH}" in
darwin*)
# Allow weak symbol support on Darwin platforms only because there
# is active community support for it.
# However, Darwin seems to break weak symbols for each new version.
#
AST_GCC_ATTRIBUTE(weak_import, [], [], PBX_WEAKREF)
# Several other platforms including Linux have GCC versions that
# define the weak attribute. However, this attribute is only
# setup for use in the code by Darwin.
AST_GCC_ATTRIBUTE(weak, [], [], PBX_WEAKREF)
;;
linux-gnu)
# Primarily support weak symbols on Linux platforms.
#
AST_GCC_ATTRIBUTE(weakref, [weakref("foo")], static, PBX_WEAKREF)
;;
*)
# Allow weak symbols on other platforms. However, any problems
# with this feature on other platforms must be fixed by the
# community.
#
AST_GCC_ATTRIBUTE(weakref, [weakref("foo")], static, PBX_WEAKREF)
;;
esac
AC_MSG_CHECKING(for -ffunction-sections support)
saved_CFLAGS="${CFLAGS}"