[Gumstix-users] gnu tool questions

[Darren G. <ts...@ya...>]

Dave gave suggestions for setting up remote gdb debugging for the  
gumstix.  I started to do this and find I don't know enough cross  
compilation lore.  Is there a generic "right" set of things to pass to  
software that's built for the gumstix using ./configure and make?  For  
example:

> AR=/home/darren/gumstix/gumstix-buildroot/build_arm/staging_dir/bin/ 
> arm-linux-uclibc-ar  
> AS=/home/darren/gumstix/gumstix-buildroot/build_arm/staging_dir/bin/ 
> arm-linux-uclibc-as  
> LD=/home/darren/gumstix/gumstix-buildroot/build_arm/staging_dir/bin/ 
> arm-linux-uclibc-ld  
> NM=/home/darren/gumstix/gumstix-buildroot/build_arm/staging_dir/bin/ 
> arm-linux-uclibc-nm  
> CC=/home/darren/gumstix/gumstix-buildroot/build_arm/staging_dir/bin/ 
> arm-linux-uclibc-gcc  
> GCC=/home/darren/gumstix/gumstix-buildroot/build_arm/staging_dir/bin/ 
> arm-linux-uclibc-gcc  
> CXX=/home/darren/gumstix/gumstix-buildroot/build_arm/staging_dir/bin/ 
> arm-linux-uclibc-g++  
> RANLIB=/home/darren/gumstix/gumstix-buildroot/build_arm/staging_dir/ 
> bin/arm-linux-uclibc-ranlib \
> 	CFLAGS="-Os -march=armv5te -mtune=xscale -Wa,-mcpu=xscale " \
> 	./configure \
> 	--target=arm-linux \
> 	--host=arm-linux \
> 	--build=i386-pc-linux-gnu \
> 	--prefix=/usr \
> 	--exec-prefix=/usr \
> 	--bindir=/usr/bin \
> 	--sbindir=/usr/sbin \
> 	--libexecdir=/usr/lib \
> 	--sysconfdir=/etc \
> 	--datadir=/usr/share \
> 	--localstatedir=/var \
> 	--mandir=/usr/man \
> 	--infodir=/usr/info \
> 	--disable-nls \
> 	--with-shared \
> 	--program-transform-name=s,,,


I found some flags from reading through the buildroot make process.  Is  
it correct/better to pass these when building anything with  
arm-linux-gcc?

  -march=armv5te -mtune=xscale -mcpu=xscale

When I tried this myself I got:

> arm-linux-gcc -c -g -march=armv5te -mtune=xscale -mcpu=xscale  
> -Ipa_common pa_unix_oss/pa_unix.c -o pa_unix_oss/pa_unix.o
> pa_unix_oss/pa_unix.c:0: warning: switch -mcpu=xscale conflicts with  
> -march= switch
> pa_unix_oss/pa_unix.c:1: warning: switch -mcpu=xscale conflicts with  
> -march= switch

When building gdb, these flags worked fine:

> home/darren/gumstix/gumstix-buildroot/build_arm/staging_dir/bin/arm- 
> linux-uclibc-gcc -c -Wall -Os -march=armv5te -mtune=xscale  
> -Wa,-mcpu=xscale     -I. -I. -I./../regformats -I./../../include  
> -I../../bfd -I./../../bfd reg-arm.c
> /home/darren/gumstix/gumstix-buildroot/build_arm/staging_dir/bin/arm- 
> linux-uclibc-gcc -c  -Wall -Os -march=armv5te -mtune=xscale  
> -Wa,-mcpu=xscale     -I. -I. -I./../regformats -I./../../include  
> -I../../bfd -I./../../bfd linux-low.c
> /home/darren/gumstix/gumstix-buildroot/build_arm/staging_dir/bin/arm- 
> linux-uclibc-gcc -c -Wall -Os -march=armv5te -mtune=xscale  
> -Wa,-mcpu=xscale     -I. -I. -I./../regformats -I./../../include  
> -I../../bfd -I./../../bfd linux-arm-low.c


Does this:
    Compile gdb on your host, but targeted for the gumstix

Imply this?:
         ./configure --target=arm-linux; make;