[Zlib-devel] I: [PATCH] introduce ELF versioning for libz.so.1

[Dmitry V. Levin]

Hi,

Since almost every new zlib release introduces new functions,
I suggest to introduce and support versioning in libz.so.1 for better
backwards compatibility.
As a zlib package maintainer in Owl and ALT Linux distributions,
I support ELF versioning for libz.so.1 since zlib-1.2.1.1.

Poposed patch for GNU/Linux is attached.
All symbols from zlib-1.1.4 remain unversioned, the patch adds versioning
only for symbols introduced in zlib-1.2.0 or later.  It also declares as
local those symbols which are not designed to be exported.


-- 
ldv
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diff -upk.orig zlib-1.2.3.orig/configure zlib-1.2.3/configure
--- zlib-1.2.3.orig/configure	2005-07-11 20:11:57 +0000
+++ zlib-1.2.3/configure	2004-09-23 11:44:43 +0000
@@ -76,7 +76,7 @@ if test "$gcc" -eq 1 && ($cc -c $cflags 
   SFLAGS=${CFLAGS-"-fPIC -O3"}
   CFLAGS="$cflags"
   case `(uname -s || echo unknown) 2>/dev/null` in
-  Linux | linux | GNU | GNU/*) LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1"};;
+  Linux | linux | GNU | GNU/*) LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,zlib.map"};;
   CYGWIN* | Cygwin* | cygwin* | OS/2* )
              EXE='.exe';;
   QNX*)  # This is for QNX6. I suppose that the QNX rule below is for QNX2,QNX4
diff -upk.orig zlib-1.2.3.orig/zlib.map zlib-1.2.3/zlib.map
--- zlib-1.2.3.orig/zlib.map	1970-01-01 00:00:00 +0000
+++ zlib-1.2.3/zlib.map	2005-08-20 13:11:28 +0000
@@ -0,0 +1,44 @@
+ZLIB_1.2.0 {
+  global:
+    compressBound;
+    deflateBound;
+    inflateBack;
+    inflateBackEnd;
+    inflateBackInit_;
+    inflateCopy;
+  local:
+    deflate_copyright;
+    inflate_copyright;
+    inflate_fast;
+    inflate_table;
+    zcalloc;
+    zcfree;
+    z_errmsg;
+    _*;
+};
+
+ZLIB_1.2.0.2 {
+    gzclearerr;
+    gzungetc;
+    zlibCompileFlags;
+} ZLIB_1.2.0;
+
+ZLIB_1.2.0.8 {
+    deflatePrime;
+} ZLIB_1.2.0.2;
+
+ZLIB_1.2.2 {
+    adler32_combine;
+    crc32_combine;
+    deflateSetHeader;
+    inflateGetHeader;
+} ZLIB_1.2.0.8;
+
+ZLIB_1.2.2.3 {
+    deflateTune;
+    gzdirect;
+} ZLIB_1.2.2;
+
+ZLIB_1.2.2.4 {
+    inflatePrime;
+} ZLIB_1.2.2.3;
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