[Zlib-devel] zlib 1.2.6.1

[Vincent Torri]

On Tue, 14 Feb 2012, Frédéric Kayser wrote:

> Hello,
> compiled and tested OK on Mac OS X 10.3.9 PowerPC, GCC 2.95, 3.1 & 3.3
> but there's a problem regarding the visibility attribute support in the configure file when using GCC 3.3 or 2.95, here is what I get in configure.log:
>
> === ztest12890.c ===
> #if ((__GNUC__-0) * 10 + __GNUC_MINOR__-0 >= 33)
> #  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))

that attribute is not defined using mingw as compiler

Vincent Torri

> #else
> #  define ZLIB_INTERNAL
> #endif
> int ZLIB_INTERNAL foo;
> int main()
> {
>  return 0;
> }
> ===
> gcc -c -O3 ztest12890.c
> ztest12890.c:11: warning: visibility attribute not supported in this configuration; ignored
> Checking for attribute(visibility) support... Yes.
>
> Visibility support is set to yes since the configure script did not catch the warning, functions defined as ZLIB_INTERNAL report the same warning during compilation, for instance:
> inffast.c: In function `inflate_fast':
> inffast.c:324: warning: visibility attribute not supported in this configuration; ignored
>
> According to Apple documentation only GCC 4 supports visibility attributes this way:
> https://developer.apple.com/library/mac/#documentation/developertools/Conceptual/CppRuntimeEnv/Articles/SymbolVisibility.html
>
> GCC 3.1 does not trigger the problem since ZLIB_INTERNAL is defined empty in this case.
> GCC 2.95 has the problem again, I suppose it comes from this:
> (__GNUC__-0) * 10 + __GNUC_MINOR__-0 >= 33
> Correct me if I'm wrong, but if run by GCC 2.95 isn't this going to be true since 2*10 + 95 = 115?
> Found in configure and zutil.h
>
> http://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html
> Another approach is to use the predefined macros to calculate a single number, then compare that against a threshold:
> #define GCC_VERSION (__GNUC__ * 10000 \
>                     + __GNUC_MINOR__ * 100 \
>                     + __GNUC_PATCHLEVEL__)
> ...
> /* Test for GCC > 3.2.0 */
> #if GCC_VERSION > 30200
>
> Best regards
> Frédéric Kayser
>
> ----- Mail original -----
> De: "Mark Adler" <madler at madler.net>
> À: "zlib developer list" <zlib-devel at zlib.net>
> Envoyé: Lundi 13 Février 2012 00:17:04
> Objet: [Zlib-devel] zlib 1.2.6.1
>
> Faithful zlib testers,
>
> zlib 1.2.6.1 is available for testing here:
>
>    http://zlib.net/current/beta/zlib-1.2.6.1.tar.gz
>
> This is a release candidate for zlib 1.2.7.  Please test it on whatever platforms you can, and report back the results.
>
> Following Vincent's suggestion to keep a list of systems to test on before release, I requested information on the systems that you can test on.  I received one reply from Maarten.  The list so far is:
>
> Adler - Mac OS X 10.6.8 with XCode 4.2 (clean compile and test)
> Adler - Ubuntu 10.04 (clean compile and test)
> Bosmans - Cross compiling from Linux for both win32 and win64 using gcc/mingw
>
> If anyone would like to add to this list, please do.  Thank you for your support.
>
> Mark
>
>
>
> MD5 (zlib-1.2.6.1.tar.gz) = bbbf81501c37816fdb05e380742c4cea
>
> SHA1(zlib-1.2.6.1.tar.gz)= d7812b15ee30e1fafadd7739ef211d3011d014f9
>
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>
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