bump SONAME major to 8
authorMichael Jeanson <mjeanson@efficios.com>
Tue, 1 Jun 2021 21:01:49 +0000 (17:01 -0400)
committerMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Thu, 3 Jun 2021 18:22:59 +0000 (14:22 -0400)
In URCU 0.11, we introduced new symbols to clean up the library symbol
namespacing, using the "alias" attribute to keep emitting the old
symbols, expecting to preserve ABI backward compatibility.
Unfortunately, it turns out that even though it works well for function
symbols, it is broken for public global variables due to the way ELF
copy relocation works.

When building a non-PIC executable that uses an extern variable, a .bss
symbol is emitted in the executable. This will take precedence over the
symbol implemented within the library in the Global Symbol Table.
Unfortunately, the alias within the library will not be aware that the
actual GST symbol differs from its alias within the library, and the
addresses for the symbol and its alias will differ at runtime.

Considering that this compatibility issue affects official library
releases, there is little we can do beyond documenting this issue, and
bumping the Userspace RCU major soname for the next (0.13) release.

Change-Id: I0ca8407dcffd871f025814923c6e329ec260133a
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

index 690fe8fa7f1d41b8c4972fc9c0927bc9a42cb4ca..6067a57f57840ef00ed6dbc5dfd0850462e26adc 100644 (file)
@@ -14,9 +14,9 @@ m4_define([urcu_version], urcu_version_major[.]urcu_version_minor[.]urcu_version
 # Library version information of "liburcu"
 # Following the numbering scheme proposed by libtool for the library version
 # http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
-m4_define([urcu_lib_version_current], [7])
+m4_define([urcu_lib_version_current], [8])
 m4_define([urcu_lib_version_revision], [0])
-m4_define([urcu_lib_version_age], [1])
+m4_define([urcu_lib_version_age], [0])
 m4_define([urcu_lib_version], urcu_lib_version_current[:]urcu_lib_version_revision[:]urcu_lib_version_age)
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