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Re: Multiply exported Gnulib symbols

From: Ludovic Courtès
Subject: Re: Multiply exported Gnulib symbols
Date: Sat, 25 Aug 2007 10:39:59 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux)


Bruno Haible <address@hidden> writes:

> Three possible issues are known:
> 1) guile defining (via gnulib) a symbol called 'strcasecmp', which overrides
>    the libc's strcasecmp symbol for libraries that come after libguile in the
>    executable's link list or are dynamically loaded.
>    We work around such problems by doing the override at the preprocessor
>    level, rather than at the link level. I.e. on a system where strcasecmp
>    is or may be defined at libc level, gnulib does
>      #define strcasecmp rpl_strcasecmp
>    and defines rpl_strcasecmp.

>From what I can see, `strcasecmp ()' is precisely one of the few symbols
not handled this way in `string_.h':

  extern int strcasecmp (char const *s1, char const *s2);

Was it intended or should it be changed to something similar to, e.g.,
the way `strndup' is handled?

> 3) Two different libraries, say, libguile and libgettextpo, using auxiliary
>    functions from gnulib. It may happen that libguile and libgettextpo both
>    define rpl_strcasecmp, and that this leads to link-time issues.
>    For this we have nothing prepackaged in gnulib-tool, but there is a
>    Makefile snippet that does the necessary #defines, i.e.
>       #define rpl_strcasecmp scm_strcasecmp
>    in guile's config.h, and
>       #define rpl_strcasecmp libgettextpo_strcasecmp
>    in libgettextpo's config.h. You find this code in the 'config.h' rule in
> http://cvs.savannah.gnu.org/viewvc/gettext/gettext-tools/libgettextpo/Makefile.am?revision=1.13&root=gettext&view=text

I second Simon's request to integrate it in Gnulib.  :-)

Thanks for your help!


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