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Re: Help linking ipfilter package.

From: Nick Clifton
Subject: Re: Help linking ipfilter package.
Date: Fri, 14 Nov 2003 09:38:15 +0000
User-agent: Gnus/5.1001 (Gnus v5.10.1) Emacs/21.2 (gnu/linux)

Hi Mario,

>  From the spec file (/usr/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.3.1/specs):
> *link_arch64:
> %{mcmodel=medlow:-M /usr/lib/ld/sparcv9/map.below4G}

> I notice with some interest that the -M in the below4G spec is the
> only place in the whole file that that -M is used (other than -MD,
> -MMD, and -MQ for a cpp section).  Is this perhaps a typo that
> should be -T?

It certainly looks like it.

For the GNU linker -M means "write a map file to the standard output"
and it does not take an argument.  Whereas -T would mean "the
following argument is a linker script".

The problem however is that for the *Solaris* native linker the -M
switch means that same thing as the -T switch to the GNU linker...

So you have two choices:

  1. Use the Solaris native linker not the GNU one.

  2. Edit the spec file to replace the -M with -T and use the GNU

The whole situation however would appear to be a bug in the header
files used to construct the spec string.  If you have access to the
gcc sources then have a look at the file gcc/config/sparc/sol2-bi.h
which is where the "-M /usr/lib/ld/sparcv9/map.below4G" option is
added to the spec string.  (In the definition of LINK_ARCH64_SPEC).

The contents of this header are *supposed* to be overridden by the
definitions in gcc/config/sparc/sol2-gld-bi.h *if* the linker is the
GNU linker.  My guess is that this file needs to provide an
alternative definition of the LINK_ARCH64_SPEC definition.

Hence you may find that this (untested, unapplied) patch will allow
you to build a gcc that does work.  (If it does work, feel free to
submit it).


Index: gcc/config/sparc/sol2-gld-bi.h
RCS file: /cvs/gcc/gcc/gcc/config/sparc/sol2-gld-bi.h,v
retrieving revision 1.3
diff -c -3 -p -r1.3 sol2-gld-bi.h
*** gcc/config/sparc/sol2-gld-bi.h      17 Jun 2003 01:00:43 -0000      1.3
--- gcc/config/sparc/sol2-gld-bi.h      14 Nov 2003 09:37:49 -0000
*** 7,9 ****
--- 7,27 ----
  %{m64:-m elf64_sparc %(link_arch64)} \
  %{!m32:%{!m64:%(link_arch_default)}} \
+ /* This is a duplicate of the defintion of LINK_ARCH64_SPEC
+    in sol2-bi.h, except that it uses -T rather than -M to
+    load the linker script.  */
+ #undef  LINK_ARCH64_SPEC
+ #define LINK_ARCH64_SPEC \
+   "%{mcmodel=medlow:-T /usr/lib/ld/sparcv9/map.below4G} \
+    %{G:-G} \
+    %{YP,*} \
+    %{R*} \
+    %{compat-bsd: \
+      %{!YP,*:%{p|pg:-Y 
P,/usr/ucblib/sparcv9:/usr/lib/libp/sparcv9:/usr/lib/sparcv9} \
+        %{!p:%{!pg:-Y P,/usr/ucblib/sparcv9:/usr/lib/sparcv9}}} \
+      -R /usr/ucblib} \
+    %{!compat-bsd: \
+      %{!YP,*:%{p|pg:-Y P,/usr/lib/libp/sparcv9:/usr/lib/sparcv9} \
+        %{!p:%{!pg:-Y P,/usr/lib/sparcv9}}}}"

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