Matthias Klose <[EMAIL PROTECTED]> writes:
> Goswin von Brederlow writes:
>> Matthias Klose <[EMAIL PROTECTED]> writes:
>>
>> > Goswin von Brederlow writes:
>> >> Hi,
>> >>
>> >> I believe the gcc source already has a patch for multiarch include and
>> >> library
>> >> directories but they are deactiveated in rules.defs.
>> >>
>> >> Can you comment on the functionality of them?
>> >
>> > no, this one is obsolete. removed in svn.
>> >
>> > Matthias
>>
>> Obsolete as in gcc already has another fix in svn or bit-rot?
>
> the latter.
I tried to fix the patch but I think it tries to change the wrong
thing.
The old lib/lib32/lib64 biarch directories must remain in gcc's search
list for compatibility reasons and one can't add a second set of
multilib dirs.
Further the directory to use depends not only on the target and
-m64/32/n32 switch, as multilib dirs do, but also on the libc we link
against.
The specs file already has an -mglibc/-muclibc switch to pick the
right dynamic linker and libc to use so I used the same mechanism to
add the multiarch directories. Adding them as -L options is not
perfect, I would have prefered some add_prefix() call, but it is the
only mechanism I could find so far.
Below the changes required for amd64 as example. Other archs and
kernels would need a similar entry.
Index: gcc-4.3-4.3.1/src/gcc/config/i386/linux64.h
===================================================================
--- gcc/config/i386/linux64.h 2008-06-24 22:35:40.000000000 +0200
+++ gcc/config/i386/linux64.h 2008-06-24 22:35:56.000000000 +0200
@@ -72,7 +72,9 @@
%{rdynamic:-export-dynamic} \
%{" SPEC_32 ":%{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER32
"}} \
%{" SPEC_64 ":%{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER64
"}}} \
- %{static:-static}}"
+ %{static:-static}} \
+ %{" SPEC_32 ":"
CHOOSE_DYNAMIC_LINKER("-L/usr/i486-linux-gnu/lib","-L/usr/i486-linux-uclibc/lib")"}
\
+ %{" SPEC_64 ":"
CHOOSE_DYNAMIC_LINKER("-L/usr/x86_64-linux-gnu/lib","-L/usr/x86_64-linux-uclibc/lib")"}"
/* Similar to standard Linux, but adding -ffast-math support. */
#undef ENDFILE_SPEC
MfG
Goswin
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