Re: [Xen-devel] [PATCH 1 of 2] Add linker flags to makefile rules to enable cross compiling

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2011-11-14 at 21:53 +0000, Andres Lagar-Cavilla wrote:
> config/x86_32.mk |  1 +
>  config/x86_64.mk |  1 +
>  2 files changed, 2 insertions(+), 0 deletions(-)
> 
> 
> For cross-compiling, the link step must also include necessary architecture
> flags (otherwise there's a mismatch between input objects and the output we're
> trying to produce).
> 
> Signed-off-by: Adin Scannell <adin@xxxxxxxxxxx>
> 
> diff -r 1f9e4cde0093 -r bf47f7aaf669 config/x86_32.mk
> --- a/config/x86_32.mk
> +++ b/config/x86_32.mk
> @@ -8,6 +8,7 @@ CONFIG_XCUTILS := y
>  CONFIG_IOEMU := y
>  
>  CFLAGS += -m32 -march=i686
> +LDFLAGS += -m32 -march=i686

I think when Adin posted this we determined that it only worked by
coincidence, since when we invoke ld directly it is as
        ld $(LDFLAGS) -melf_x86_64
so while -m32 -march= are unknown to ld the -nelf_xx (which is a valid
ld option) takes precedence and things work ok.

The consensus then was that we need to split LDFLAGS-for-gcc-as-linker
from LDFLAGS-for-ld-directly into two variables. See Jan's response in
<4E844703020000780005868E@xxxxxxxxxxxxxxxxxxxx>.

Ian.

>  
>  # Use only if calling $(LD) directly.
>  LDFLAGS_DIRECT_OpenBSD = _obsd
> diff -r 1f9e4cde0093 -r bf47f7aaf669 config/x86_64.mk
> --- a/config/x86_64.mk
> +++ b/config/x86_64.mk
> @@ -9,6 +9,7 @@ CONFIG_XCUTILS := y
>  CONFIG_IOEMU := y
>  
>  CFLAGS += -m64
> +LDFLAGS += -m64
>  
>  LIBLEAFDIR = $(LIBLEAFDIR_x86_64)
>  LIBDIR = $(LIBDIR_x86_64)
> 
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