Re: [Xen-devel] [PATCH 8 of 8] xen: add "clang=y" option to build Xen with clang/llvm instead of gcc

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 07/03/2011 16:29, "Tim Deegan" <Tim.Deegan@xxxxxxxxxx> wrote:

> At 14:54 +0000 on 07 Mar (1299509669), Ian Campbell wrote:
>> Is it worth arranging for "gcc := y" when clang is not enabled? Then a
>> whole bunch of this sort of thing devolves into the
>> CFLAGS-$(a-particular-cc) += -Wfoo
>> pattern.
> 
> Something like the attached?  It tidies up four such ifeqs, at the cost
> of one new one to define $(gcc).
> (4 files changed, 17 insertions(+), 16 deletions(-))

This looks like a definite improvement in readability, to me. I'd like it to
be applied.

 -- Keir

>>> @@ -1,6 +1,11 @@
>>>  AS         = $(CROSS_COMPILE)as
>>> +ifeq ($(clang),y)
>>> +LD         = $(CROSS_COMPILE)gold
>>> +CC         = $(CROSS_COMPILE)clang
>>> +else
>>>  LD         = $(CROSS_COMPILE)ld
>>>  CC         = $(CROSS_COMPILE)gcc
>>> +endif
>>>  CPP        = $(CC) -E
>>>  AR         = $(CROSS_COMPILE)ar
>>>  RANLIB     = $(CROSS_COMPILE)ranlib
>> 
>> LD-$(clang) = ...
>> LD-$(gcc)   = ...
>> 
>> LD := $(LD-y)
> 
> I tried that but it looks about as bad, and actually has more
> repetition. 
> 
> Tim.



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