[v3,RESEND-2] pkg-infra: make sure cross compiling is enabled when host == target

When compiling for the same architecture and libc as the host,
GNU_TARGET_NAME and GNU_HOST_NAME are equal.  configure scripts use
these to detect cross-compilation, and will decide that we're doing
native compilation.  This may trigger running of executables,
which fail because of missing libraries in the host environment.

To solve this, set the vendor part in GNU_TARGET_NAME to buildroot.

This problem exists for instance in xserver_xorg-server on x86_64.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
RESEND I hit this again while compiling xserver_xorg-server...
RESEND-2 And again, after testing the xorg updates.
         Added ThomasP's Acked-by as well.

v3: modify GNU_TARGET_NAME instead of GNU_HOST_NAME, which makes a lot
    more sense of course.  Thank you ThomasP!

    I only tested this one with xserver_xorg-server on a Sourcery
    x86_64 toolchain and with a simple config and an internal toolchain.

v2: -buildroot- instead of -buildroot_cross-, as suggested by ThomasP.

 package/Makefile.in |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Peter,

Could you apply this one? It has been around for a very long time.

Thanks!

Thomas

On Wed,  3 Oct 2012 11:26:30 +0200, Arnout Vandecappelle
(Essensium/Mind) wrote:
> When compiling for the same architecture and libc as the host,
> GNU_TARGET_NAME and GNU_HOST_NAME are equal.  configure scripts use
> these to detect cross-compilation, and will decide that we're doing
> native compilation.  This may trigger running of executables,
> which fail because of missing libraries in the host environment.
> 
> To solve this, set the vendor part in GNU_TARGET_NAME to buildroot.
> 
> This problem exists for instance in xserver_xorg-server on x86_64.
> 
> Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
> Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> ---
> RESEND I hit this again while compiling xserver_xorg-server...
> RESEND-2 And again, after testing the xorg updates.
>          Added ThomasP's Acked-by as well.
> 
> v3: modify GNU_TARGET_NAME instead of GNU_HOST_NAME, which makes a lot
>     more sense of course.  Thank you ThomasP!
> 
>     I only tested this one with xserver_xorg-server on a Sourcery
>     x86_64 toolchain and with a simple config and an internal
> toolchain.
> 
> v2: -buildroot- instead of -buildroot_cross-, as suggested by ThomasP.
> 
>  package/Makefile.in |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/package/Makefile.in b/package/Makefile.in
> index 64508b2..30a542a 100644
> --- a/package/Makefile.in
> +++ b/package/Makefile.in
> @@ -20,7 +20,7 @@ MAKE1:=$(HOSTMAKE) -j1
>  MAKE:=$(HOSTMAKE) -j$(PARALLEL_JOBS)
>  
>  # Compute GNU_TARGET_NAME
> -GNU_TARGET_NAME=$(ARCH)-unknown-linux-$(LIBC)$(ABI)
> +GNU_TARGET_NAME=$(ARCH)-buildroot-linux-$(LIBC)$(ABI)
>  
>  ifeq
> ($(BR2_TOOLCHAIN_BUILDROOT)$(BR2_TOOLCHAIN_CTNG_uClibc)$(BR2_TOOLCHAIN_EXTERNAL_UCLIBC),y)
> LIBC=uclibc

>>>>> "Arnout" == Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> writes:

 Arnout> When compiling for the same architecture and libc as the host,
 Arnout> GNU_TARGET_NAME and GNU_HOST_NAME are equal.  configure scripts use
 Arnout> these to detect cross-compilation, and will decide that we're doing
 Arnout> native compilation.  This may trigger running of executables,
 Arnout> which fail because of missing libraries in the host environment.

 Arnout> To solve this, set the vendor part in GNU_TARGET_NAME to buildroot.

 Arnout> This problem exists for instance in xserver_xorg-server on x86_64.

Committed, thanks.

On Thu, 04 Oct 2012 22:50:45 +0200, Peter Korsgaard wrote:

> Committed, thanks.

Thanks!

Thomas