Re: Suppress -fprofile-arcs in extras.o rule

[Bart Veer <bartv@ecoscentric.com>]

>>>>> "John" == John Dallaway <john@dallaway.org.uk> writes:

    John> This patch eliminates the possibility of passing
    John> -fprofile-arcs from the global CFLAGS to the linker when
    John> generating extras.o. -fprofile-arcs would imply -lgcov and
    John> interfere with subsequent application linking.

    John> Checked-in.

This makes no sense to me. AFAIK gcc -Wl,--whole-archive should only
invoke the linker, not the compiler, and the option -fprofile-arcs
only affects the compiler (a grep through a binutils checkout for
profile-arcs shows no hits). The presence or absence of
-fprofile-arcs/-fno-profile-arcs in this custom build step should have
no effect whatsoever on the build.

If any of eCos is built with -profile-arcs in the global CFLAGS then
the compiler will generate extra code which will have a dependency,
either on a gcov support library or on some other profiling library
interested in run-time behaviour at the arc level. The linker is not
going to eliminate that extra code just because you add
-fno-profile-arcs to the linker command line, so the dependency
remains.

Hence all this patch achieves is to add some unnecessary and confusing
noise to the build process.

Bart

-- 
Bart Veer                                   eCos Configuration Architect
eCosCentric Limited    The eCos experts      http://www.ecoscentric.com/
Barnwell House, Barnwell Drive, Cambridge, UK.      Tel: +44 1223 245571
Registered in England and Wales: Reg No 4422071.