Re: Configuring linker flags while cross-compiling gdb

[Aaron Gaudio <agaudio at eng dot mc dot xerox dot com>]

On Mon, 2005-06-13 at 11:30 -0400, Daniel Jacobowitz wrote:
> On Mon, Jun 13, 2005 at 11:26:06AM -0400, Aaron Gaudio wrote:
> > Continuing with my adventure from last week, I am now trying to cross-
> > comile gdb to run on i386-pc-solaris2.10 and build on sparc-sun-
> > solaris2.10. 
> > 
> > I used the following configure line:
> > 
> > $ bash_cv_have_mbstate_t=yes ./configure --build sparc-sun-solaris2.8 --
> > host i386-pc-solaris2.10
> > 
> > This seems to get the correct compilers to use. However, when trying to
> > link, it is missing the correct rpath-link (where I have the x86 sysroot
> > to link system libraries), and it is also not linking in a required
> > library, libsocket (I get undefined symbols that manually adding -
> > lsocket to the link command fixes).
> 
> These both sound like problems with your cross compiler, not problems
> with GDB.

In the case of libsocket, it is not a cross-compiler problem; you always
have to add -lsocket to the link libs when using things like socket(),
or linking libraries that do (such as X11 libs). The problem is that
when building a native gdb on solaris (with --target=i386-pc-
solaris2.10), configure detects that -lsocket is required and adds it to
the appopriate Makefile macros, but does not when building for x86
Solaris....


> 
> No, that's for target libraries.  Gdb is a host program.  The fact taht
> build != host is irrelevant here; your "target" is i386-pc-solaris2.10,
> and so is your "host".  LDFLAGS is the correct place to add flags for
> the host.
> 

I've tried this, but it didn't seem to change anything. Part of the
confusion is that the sub-level configures don't get called until you
run a top-level make, and not all environment variables set (such as
LDFLAGS) at configure time get cascaded to the sub-level configure, and
furthermore I'm not sure the sub-level Makefile is handling merging
LDFLAGS from the environment and from the makefile (since I just want to
tell it to add "-lsocket", not manually figure out every single library
that needs to be linked).

Any further help is much appreciated.

-- 
Aaron Gaudio           agaudio @ eng.mc.xerox.com           585-422-6876

                  While life is yours, live joyously;
                None can escape Death's searching eye:
                When once this frame of ours they burn,
                   How shall it e'er again return?

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