Hi,
On Mon, Jul 13, 2015 at 02:10:53PM +0300, Alexey Brodkin wrote:
> This reverts commit 5ef7bbb09f7b
> ("perf tools: Allow to specify custom linker command").
>
> LD is a pre-defined variable in GNU Make. I.e. it is always defined.
> Which means there's no point to check "LD ?= ..." because it will never
> succeed. And so LD will be either that explicitly passed to make like
> this:
> ------->8-------
> make LD=path_to_my_ld ...
> ------->8-------
> or default value, which is host's "ld".
>
> Latter leads to failure of cross-linkage because instead of cross linker
> "$(CROSS_COMPILE)ld" host's "ld" is used.
>
> As for commit which is reverted here:
> [1] Usually for selection of non-default flavour of CPU core/options
> linker flags are used like "-mtune=xxx" or "-mMyCPUType" etc.
>
> [2] Still to implement ability to use "ld" that differs from
> "$(CROSS_COMPILE)ld" one will need to add new makefile variable like
> TARGET_LD and then check if $(TARGET_LD) is not specified on make
> invocation then use "$(CROSS_COMPILE)ld".
>
> But for now to fix cross-building of perf this revert is enough.
Hmm. You are probably right, my build system always exports LD with
correct linker for cross builds so perhaps that's why I this "worked"
for me when testing. Sorry.
I guess the correct fix would be [1], i.e. there should be some new
variable to pass flags to ld command.
Or maybe [2], could we use make "origin" function? If LD is "default",
then use "$(CROSS_COMPILE)ld", otherwise use what the user passed?
A.
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