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