Re: glib2-shlibs.info clang fix

On Sun, 10 Jul 2011 17:47:33 -0400, Jack Howarth
  wrote:
   The current glib2-shlibs.info in unstable fails to build under clang
> due to errors of the form... 
>
> /bin/sh ../libtool  --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. 
> -I..  -I..  -DG_LOG_DOMAIN=\"GLib\" -DG_DISABLE_CAST_CHECKS 
> -DG_DISABLE_DEPRECATED -DGLIB_COMPILATION -DPCRE_STATIC -I/sw/include 
> -DG_DISABLE_SINGLE_INCLUDES   -Os -Wall -c -o garray.lo garray.c
> libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -I.. 
> -DG_LOG_DOMAIN=\"GLib\" -DG_DISABLE_CAST_CHECKS 
> -DG_DISABLE_DEPRECATED -DGLIB_COMPILATION -DPCRE_STATIC -I/sw/include 
> -DG_DISABLE_SINGLE_INCLUDES -Os -Wall -c garray.c  -fno-common -DPIC 
> -o .libs/garray.o
> In file included from garray.c:944:
> ./galiasdef.c:18:72: error: only weak aliases are supported on darwin
> extern __typeof (g_array_append_vals) g_array_append_vals 
> __attribute((alias("IA__g_array_append_vals"), 
> visibility("default")));
>                                                                        ^
> ./galiasdef.c:21:58: error: only weak aliases are supported on darwin
> extern __typeof (g_array_free) g_array_free 
> __attribute((alias("IA__g_array_free"), visibility("default")));
>                                                          ^
> ./galiasdef.c:24:72: error: only weak aliases are supported on darwin
> extern __typeof (g_array_insert_vals) g_array_insert_vals 
> __attribute((alias("IA__g_array_insert_vals"), 
> visibility("default")));
>
> Only two solutions are possible. The first, patching 
> glib/makegalias.pl and friends to emit
> "weak, alias" rather than "alias" seems difficult to implement. The 
> far simplier fix is to just
> append --disable-visibility to ConfigureParams. Note that configure 
> in glib reports... 
>
>   --disable-visibility    don't use ELF visibility attributes
>
> The Mach-O object format doesn't support true alias in the object 
> files ala ELF and the weak import that Geoff Keatting created is 
> considered a partially functional hack. 
> So in the absence of any failures in glib, the --disable-visibility 
> option seems wiser. 

Done. I compared the binary interfaces of the libraries before and 
after this change, and they have the same set of public defined symbols. 

dan

  --
Daniel Macks
[email protected]



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