From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Fri, 19 Mar 2021 17:21:05 +0000 (+0000)
Subject: Add OTHER_SHLIB_COMPAT
X-Git-Tag: glibc-2.34~763
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=4d2e9ef806bd9edc9cf5e133983a4e86ddab381a;p=thirdparty%2Fglibc.git

Add OTHER_SHLIB_COMPAT

It is similar to SHLIB_COMPAT, but allows to check versions from
other libraries.  It is used to move compat symbol from other libraries
to libc.
---

diff --git a/include/shlib-compat.h b/include/shlib-compat.h
index 537851d7531..6c423c8cb02 100644
--- a/include/shlib-compat.h
+++ b/include/shlib-compat.h
@@ -53,6 +53,14 @@
 # define SHLIB_COMPAT(lib, introduced, obsoleted)			      \
   _LIB_COMPAT (lib, introduced, obsoleted)
 
+/* Like SHLIB_COMPAT, but it can check versions in other libraries.  It is
+   not always false for !IS_IN (LIB).  */
+#define OTHER_SHLIB_COMPAT(lib, introduced, obsoleted)	\
+  _OTHER_SHLIB_COMPAT (lib, introduced, obsoleted)
+#define _OTHER_SHLIB_COMPAT(lib, introduced, obsoleted)			\
+  (!(ABI_##lib##_##obsoleted - 0)					\
+   || ((ABI_##lib##_##introduced - 0) < (ABI_##lib##_##obsoleted - 0)))
+
 /* That header also defines symbols like `VERSION_libm_GLIBC_2_1' to
    the version set name to use for e.g. symbols first introduced into
    libm in the GLIBC_2.1 version.  Definitions of symbols with explicit
@@ -106,6 +114,7 @@
 
 /* Not compiling ELF shared libraries at all, so never any old versions.  */
 # define SHLIB_COMPAT(lib, introduced, obsoleted)	0
+# define OTHER_SHLIB_COMPAT(lib, introduced, obsoleted)	0
 
 /* No versions to worry about, just make this the global definition.  */
 # define versioned_symbol(lib, local, symbol, version) \