On Thu, Jun 26, 2008 at 08:46:44PM +0200, Michal Simek wrote:
> Adrian Bunk napsal(a):
> > On Thu, Jun 26, 2008 at 02:29:31PM +0200, monstr@xxxxxxxxx wrote:
> >> ...
> >> --- /dev/null
> >> +++ b/arch/microblaze/Makefile
> >> ...
> >> +# Work out HW multipler support. This is icky.
> >> +# 1. Spartan2 has no HW multiplers.
> >> +# 2. MicroBlaze v3.x always uses them, except in Spartan 2
> >> +# 3. All other FPGa/CPU ver combos, we can trust the CONFIG_ settings
> >> +ifeq (,$(findstring spartan2,$(CONFIG_XILINX_MICROBLAZE0_FAMILY)))
> >> + ifeq ($(CPU_MAJOR),3)
> >> + CPUFLAGS-1 += -mno-xl-soft-mul
> >> + else
> >> + # USE_HW_MUL can be 0, 1, or 2, defining a heirarchy of HW Mul support.
> >> + CPUFLAGS-$(subst 1,,$(CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL)) += -mxl-multiply-high
> >> + CPUFLAGS-$(CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL) += -mno-xl-soft-mul
> >> + endif
> >> +endif
> >> +CPUFLAGS-$(CONFIG_XILINX_MICROBLAZE0_USE_DIV) += -mno-xl-soft-div
> >> +CPUFLAGS-$(CONFIG_XILINX_MICROBLAZE0_USE_BARREL) += -mxl-barrel-shift
> >> +CPUFLAGS-$(CONFIG_XILINX_MICROBLAZE0_USE_PCMP) += -mxl-pattern-compare
> >> +
> >> +CPUFLAGS-1 += $(call cc-option,-mcpu=v$(CPU_VER))
> >> +
> >> +# The various CONFIG_XILINX cpu features options are integers 0/1/2...
> >> +# rather than bools y/n
> >> +CFLAGS += $(CPUFLAGS-1)
> >> +CFLAGS += $(CPUFLAGS-2)
> >> ...
> >
> > Why are the options not bools?
> >
> > cu
> > Adrian
>
> because CONFIG_XILINX_... are 0, 1 or 2 not only y, n.
I understood that.
But _why_ are these options not bools?
In most cases the order of gcc flags does not matter, and it is not
obvious for me why the order matters here.
> M
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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