Re: [Xen-devel] [PATCH] prepend the include path of libvixl header files

[Peter Maydell <peter.maydell@xxxxxxxxxx>]

On 7 July 2014 16:25, Stefano Stabellini
<stefano.stabellini@xxxxxxxxxxxxx> wrote:
> Currently the Makefile of disas/libvixl appends
> -I$(SRC_PATH)/disas/libvixl to QEMU_CFLAGS. As a consequence C++ files
> that #include "utils.h", such as disas/libvixl/a64/instructions-a64.cc,
> are going to look for utils.h on all the other include paths first.
>
> When building QEMU as part of the Xen make system, another unrelated
> utils.h file is going to be chosen for inclusion, causing a build
> failure:
>
> In file included from disas/libvixl/a64/instructions-a64.cc:27:0:
> /qemu/disas/libvixl/a64/instructions-a64.h:88:64: error:
> ârawbits_to_floatâ was not declared in this scope
>  const float kFP32PositiveInfinity = rawbits_to_float(0x7f800000);
>
> Fix the problem by prepending (rather than appending) the libvixl
> include path to QEMU_CFLAGS.
>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
>
> ---
>
> diff --git a/disas/libvixl/Makefile.objs b/disas/libvixl/Makefile.objs
> index 0adb3ce..17e6565 100644
> --- a/disas/libvixl/Makefile.objs
> +++ b/disas/libvixl/Makefile.objs
> @@ -3,6 +3,6 @@ libvixl_OBJS = utils.o \
>                 a64/decoder-a64.o \
>                 a64/disasm-a64.o
>
> -$(addprefix $(obj)/,$(libvixl_OBJS)): QEMU_CFLAGS += 
> -I$(SRC_PATH)/disas/libvixl
> +$(addprefix $(obj)/,$(libvixl_OBJS)): QEMU_CFLAGS := 
> -I$(SRC_PATH)/disas/libvixl $(QEMU_CFLAGS)
>
>  common-obj-$(CONFIG_ARM_A64_DIS) += $(libvixl_OBJS)

Reviewed-by: Peter Maydell <peter.maydell@xxxxxxxxxx>

I spent a few moments wondering if the conversion of
QEMU_CFLAGS from recursively-expanded to simply-expanded
would be a problem, but because this is a target-specific
variable it's pretty much going to be expanded at the same
point that it would be anyhow.

thanks
-- PMM

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