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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Updated: (STDCXX-1031) [gcc 4.0] make use of gcc 4.1 -fvisibility option
Date Sat, 14 Feb 2009 23:19:59 GMT

     [ https://issues.apache.org/jira/browse/STDCXX-1031?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Sebor updated STDCXX-1031:
---------------------------------

    Environment: gcc 4.0 and better on ELF targets  (was: gcc 4.1 and better on ELF targets)
        Summary: [gcc 4.0] make use of gcc 4.1 -fvisibility option  (was: [gcc 4.1] make use
of gcc 4.1 -fvisibility option)

The option is available in gcc 4.0: see {{[-fvisibility | http://gcc.gnu.org/onlinedocs/gcc-4.0.4/gcc/Code-Gen-Options.html#index-fvisibility-1577]}}
in the GCC 4.0.4 manual.

> [gcc 4.0] make use of gcc 4.1 -fvisibility option
> -------------------------------------------------
>
>                 Key: STDCXX-1031
>                 URL: https://issues.apache.org/jira/browse/STDCXX-1031
>             Project: C++ Standard Library
>          Issue Type: Improvement
>          Components: Build and Installation
>    Affects Versions: 4.2.1
>         Environment: gcc 4.0 and better on ELF targets
>            Reporter: Martin Sebor
>            Assignee: Martin Sebor
>             Fix For: 4.2.2
>
>
> The gcc 4.1 {{[-fvisibility | http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Code-Gen-Options.html#index-fvisibility-1636]}}
option is said to
> {quote}
> ??...very substantially improve linking and load times of shared object libraries, produce
more optimized code, provide near-perfect API export and prevent symbol clashes. It is *strongly*
recommended that you use this in any shared objects you distribute.??
> {quote}
> In order for stdcxx users to benefit as described in the gcc manual we should make use
of the {{-fvisibility=hidden}} option in conjunction with {{[\_\_attribute\_\_((visibility("default")))
| http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Function-Attributes.html#index-g_t_0040code_007bvisibility_007d-attribute-1830]}}
on exported interfaces as the gcc manual recommends.
> Besides adding the {{-fvisibility=hidden}} option to the command line when building shared
libraries with gcc, the implementation involves defining the {{_RWSTD_EXPORT}} macro for gcc
as follows:
> {code}
> #define _RWSTD_EXPORT __attribute__ ((visibility ("default")))
> {code}
> Note that since gcc requires the {{\_\_attribute\_\_}} decoration only on function declarations
and issues a warning when it appears on definitions so the {{_RWSTD_EXPORT}} macro must not
be used on definitions.

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